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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 08:59:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-05 08:59:22 -0700
commitbbc4fd12a635492ad9d12bb418124fa2d5f0d734 (patch)
treefe245d350db180d499a9e9d6dc84bbb308f33dc2 /arch
parent673b864fd76a29031aa0b4b08fc80886d527b3b7 (diff)
parent2d5973cb5ac5d04662f86e19a06a4c52fa4c4ae3 (diff)
Merge branch 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze
* 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze: (49 commits) microblaze: Add KGDB support microblaze: Support brki rX, 0x18 for user application debugging microblaze: Remove nop after MSRCLR/SET, MTS, MFS instructions microblaze: Simplify syscall rutine microblaze: Move PT_MODE saving to delay slot microblaze: Fix _interrupt function microblaze: Fix _user_exception function microblaze: Put together addik instructions microblaze: Use delay slot in syscall macros microblaze: Save kernel mode in delay slot microblaze: Do not mix register saving and mode setting microblaze: Move SAVE_STATE upward microblaze: entry.S: Macro optimization microblaze: Optimize hw exception rutine microblaze: Implement clear_ums macro and fix SAVE_STATE macro microblaze: Remove additional setup for kernel_mode microblaze: Optimize SAVE_STATE macro microblaze: Remove additional loading microblaze: Completely remove working with R11 register microblaze: Do not setup BIP in _debug_exception ...
Diffstat (limited to 'arch')
-rw-r--r--arch/microblaze/Kconfig31
-rw-r--r--arch/microblaze/Kconfig.debug1
-rw-r--r--arch/microblaze/boot/Makefile11
-rw-r--r--arch/microblaze/include/asm/cacheflush.h18
-rw-r--r--arch/microblaze/include/asm/dma-mapping.h6
-rw-r--r--arch/microblaze/include/asm/elf.h2
-rw-r--r--arch/microblaze/include/asm/exceptions.h21
-rw-r--r--arch/microblaze/include/asm/kgdb.h28
-rw-r--r--arch/microblaze/include/asm/page.h12
-rw-r--r--arch/microblaze/include/asm/pvr.h2
-rw-r--r--arch/microblaze/include/asm/setup.h2
-rw-r--r--arch/microblaze/include/asm/system.h1
-rw-r--r--arch/microblaze/include/asm/uaccess.h4
-rw-r--r--arch/microblaze/include/asm/unwind.h29
-rw-r--r--arch/microblaze/kernel/Makefile3
-rw-r--r--arch/microblaze/kernel/cpu/mb.c1
-rw-r--r--arch/microblaze/kernel/entry-nommu.S28
-rw-r--r--arch/microblaze/kernel/entry.S607
-rw-r--r--arch/microblaze/kernel/exceptions.c9
-rw-r--r--arch/microblaze/kernel/head.S4
-rw-r--r--arch/microblaze/kernel/hw_exception_handler.S4
-rw-r--r--arch/microblaze/kernel/irq.c2
-rw-r--r--arch/microblaze/kernel/kgdb.c147
-rw-r--r--arch/microblaze/kernel/misc.S2
-rw-r--r--arch/microblaze/kernel/process.c7
-rw-r--r--arch/microblaze/kernel/ptrace.c17
-rw-r--r--arch/microblaze/kernel/stacktrace.c44
-rw-r--r--arch/microblaze/kernel/timer.c24
-rw-r--r--arch/microblaze/kernel/traps.c91
-rw-r--r--arch/microblaze/kernel/unwind.c318
-rw-r--r--arch/microblaze/kernel/vmlinux.lds.S16
-rw-r--r--arch/microblaze/mm/fault.c16
-rw-r--r--arch/microblaze/mm/init.c7
33 files changed, 974 insertions, 541 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 505a08592423..be3855250db6 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -14,6 +14,7 @@ config MICROBLAZE
select USB_ARCH_HAS_EHCI
select ARCH_WANT_OPTIONAL_GPIOLIB
select HAVE_OPROFILE
+ select HAVE_ARCH_KGDB
select HAVE_DMA_ATTRS
select HAVE_DMA_API_DEBUG
select TRACING_SUPPORT
@@ -223,6 +224,36 @@ config TASK_SIZE
hex "Size of user task space" if TASK_SIZE_BOOL
default "0x80000000"
+choice
+ prompt "Page size"
+ default MICROBLAZE_4K_PAGES
+ depends on ADVANCED_OPTIONS && !MMU
+ help
+ Select the kernel logical page size. Increasing the page size
+ will reduce software overhead at each page boundary, allow
+ hardware prefetch mechanisms to be more effective, and allow
+ larger dma transfers increasing IO efficiency and reducing
+ overhead. However the utilization of memory will increase.
+ For example, each cached file will using a multiple of the
+ page size to hold its contents and the difference between the
+ end of file and the end of page is wasted.
+
+ If unsure, choose 4K_PAGES.
+
+config MICROBLAZE_4K_PAGES
+ bool "4k page size"
+
+config MICROBLAZE_8K_PAGES
+ bool "8k page size"
+
+config MICROBLAZE_16K_PAGES
+ bool "16k page size"
+
+config MICROBLAZE_32K_PAGES
+ bool "32k page size"
+
+endchoice
+
endmenu
source "mm/Kconfig"
diff --git a/arch/microblaze/Kconfig.debug b/arch/microblaze/Kconfig.debug
index 9dc708a7f700..e6e5e0da28c3 100644
--- a/arch/microblaze/Kconfig.debug
+++ b/arch/microblaze/Kconfig.debug
@@ -10,6 +10,7 @@ source "lib/Kconfig.debug"
config EARLY_PRINTK
bool "Early printk function for kernel"
+ depends on SERIAL_UARTLITE_CONSOLE
default n
help
This option turns on/off early printk messages to console.
diff --git a/arch/microblaze/boot/Makefile b/arch/microblaze/boot/Makefile
index 57f50c2371c6..be01d78750d9 100644
--- a/arch/microblaze/boot/Makefile
+++ b/arch/microblaze/boot/Makefile
@@ -35,13 +35,14 @@ quiet_cmd_cp = CP $< $@$2
cmd_cp = cat $< >$@$2 || (rm -f $@ && echo false)
quiet_cmd_strip = STRIP $@
- cmd_strip = $(STRIP) -K _start -K _end -K __log_buf -K _fdt_start vmlinux -o $@
+ cmd_strip = $(STRIP) -K microblaze_start -K _end -K __log_buf \
+ -K _fdt_start vmlinux -o $@
quiet_cmd_uimage = UIMAGE $@.ub
- cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A microblaze -O linux -T kernel \
- -C none -n 'Linux-$(KERNELRELEASE)' \
- -a $(CONFIG_KERNEL_BASE_ADDR) -e $(CONFIG_KERNEL_BASE_ADDR) \
- -d $@ $@.ub
+ cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A microblaze -O linux -T kernel \
+ -C none -n 'Linux-$(KERNELRELEASE)' \
+ -a $(CONFIG_KERNEL_BASE_ADDR) -e $(CONFIG_KERNEL_BASE_ADDR) \
+ -d $@ $@.ub
$(obj)/simpleImage.%: vmlinux FORCE
$(call if_changed,cp,.unstrip)
diff --git a/arch/microblaze/include/asm/cacheflush.h b/arch/microblaze/include/asm/cacheflush.h
index a6edd356cd08..7ebd955460d9 100644
--- a/arch/microblaze/include/asm/cacheflush.h
+++ b/arch/microblaze/include/asm/cacheflush.h
@@ -17,6 +17,7 @@
/* Somebody depends on this; sigh... */
#include <linux/mm.h>
+#include <linux/io.h>
/* Look at Documentation/cachetlb.txt */
@@ -60,7 +61,6 @@ void microblaze_cache_init(void);
#define invalidate_icache() mbc->iin();
#define invalidate_icache_range(start, end) mbc->iinr(start, end);
-
#define flush_icache_user_range(vma, pg, adr, len) flush_icache();
#define flush_icache_page(vma, pg) do { } while (0)
@@ -72,9 +72,15 @@ void microblaze_cache_init(void);
#define flush_dcache() mbc->dfl();
#define flush_dcache_range(start, end) mbc->dflr(start, end);
-#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
-/* D-cache aliasing problem can't happen - cache is between MMU and ram */
-#define flush_dcache_page(page) do { } while (0)
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+/* MS: We have to implement it because of rootfs-jffs2 issue on WB */
+#define flush_dcache_page(page) \
+do { \
+ unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
+ addr = (u32)virt_to_phys((void *)addr); \
+ flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
+} while (0);
+
#define flush_dcache_mmap_lock(mapping) do { } while (0)
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
@@ -97,8 +103,10 @@ void microblaze_cache_init(void);
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
do { \
+ u32 addr = virt_to_phys(dst); \
+ invalidate_icache_range((unsigned) (addr), (unsigned) (addr) + (len));\
memcpy((dst), (src), (len)); \
- flush_icache_range((unsigned) (dst), (unsigned) (dst) + (len)); \
+ flush_dcache_range((unsigned) (addr), (unsigned) (addr) + (len));\
} while (0)
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h
index 18b3731c8509..507389580709 100644
--- a/arch/microblaze/include/asm/dma-mapping.h
+++ b/arch/microblaze/include/asm/dma-mapping.h
@@ -79,12 +79,6 @@ static inline int dma_supported(struct device *dev, u64 mask)
return ops->dma_supported(dev, mask);
}
-#ifdef CONFIG_PCI
-/* We have our own implementation of pci_set_dma_mask() */
-#define HAVE_ARCH_PCI_SET_DMA_MASK
-
-#endif
-
static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
struct dma_map_ops *ops = get_dma_ops(dev);
diff --git a/arch/microblaze/include/asm/elf.h b/arch/microblaze/include/asm/elf.h
index 7d4acf2b278e..732caf1be741 100644
--- a/arch/microblaze/include/asm/elf.h
+++ b/arch/microblaze/include/asm/elf.h
@@ -77,7 +77,7 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
#define ELF_DATA ELFDATA2MSB
#endif
-#define ELF_EXEC_PAGESIZE 4096
+#define ELF_EXEC_PAGESIZE PAGE_SIZE
#define ELF_CORE_COPY_REGS(_dest, _regs) \
diff --git a/arch/microblaze/include/asm/exceptions.h b/arch/microblaze/include/asm/exceptions.h
index 4c7b5d037c88..6479097b802b 100644
--- a/arch/microblaze/include/asm/exceptions.h
+++ b/arch/microblaze/include/asm/exceptions.h
@@ -14,6 +14,11 @@
#define _ASM_MICROBLAZE_EXCEPTIONS_H
#ifdef __KERNEL__
+
+#ifndef CONFIG_MMU
+#define EX_HANDLER_STACK_SIZ (4*19)
+#endif
+
#ifndef __ASSEMBLY__
/* Macros to enable and disable HW exceptions in the MSR */
@@ -64,22 +69,6 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
void die(const char *str, struct pt_regs *fp, long err);
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr);
-#if defined(CONFIG_KGDB)
-void (*debugger)(struct pt_regs *regs);
-int (*debugger_bpt)(struct pt_regs *regs);
-int (*debugger_sstep)(struct pt_regs *regs);
-int (*debugger_iabr_match)(struct pt_regs *regs);
-int (*debugger_dabr_match)(struct pt_regs *regs);
-void (*debugger_fault_handler)(struct pt_regs *regs);
-#else
-#define debugger(regs) do { } while (0)
-#define debugger_bpt(regs) 0
-#define debugger_sstep(regs) 0
-#define debugger_iabr_match(regs) 0
-#define debugger_dabr_match(regs) 0
-#define debugger_fault_handler ((void (*)(struct pt_regs *))0)
-#endif
-
#endif /*__ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */
diff --git a/arch/microblaze/include/asm/kgdb.h b/arch/microblaze/include/asm/kgdb.h
new file mode 100644
index 000000000000..78b17d40b235
--- /dev/null
+++ b/arch/microblaze/include/asm/kgdb.h
@@ -0,0 +1,28 @@
+#ifdef __KERNEL__
+#ifndef __MICROBLAZE_KGDB_H__
+#define __MICROBLAZE_KGDB_H__
+
+#ifndef __ASSEMBLY__
+
+#define CACHE_FLUSH_IS_SAFE 1
+#define BUFMAX 2048
+
+/*
+ * 32 32-bit general purpose registers (r0-r31)
+ * 6 32-bit special registers (pc, msr, ear, esr, fsr, btr)
+ * 12 32-bit PVR
+ * 7 32-bit MMU Regs (redr, rpid, rzpr, rtlbx, rtlbsx, rtlblo, rtlbhi)
+ * ------
+ * 57 registers
+ */
+#define NUMREGBYTES (57 * 4)
+
+#define BREAK_INSTR_SIZE 4
+static inline void arch_kgdb_breakpoint(void)
+{
+ __asm__ __volatile__("brki r16, 0x18;");
+}
+
+#endif /* __ASSEMBLY__ */
+#endif /* __MICROBLAZE_KGDB_H__ */
+#endif /* __KERNEL__ */
diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
index 464ff32bee3d..c12c6dfafd9f 100644
--- a/arch/microblaze/include/asm/page.h
+++ b/arch/microblaze/include/asm/page.h
@@ -23,8 +23,16 @@
#ifdef __KERNEL__
/* PAGE_SHIFT determines the page size */
-#define PAGE_SHIFT (12)
-#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
+#if defined(CONFIG_MICROBLAZE_32K_PAGES)
+#define PAGE_SHIFT 15
+#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
+#define PAGE_SHIFT 14
+#elif defined(CONFIG_MICROBLAZE_8K_PAGES)
+#define PAGE_SHIFT 13
+#else
+#define PAGE_SHIFT 12
+#endif
+#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
diff --git a/arch/microblaze/include/asm/pvr.h b/arch/microblaze/include/asm/pvr.h
index e38abc7714b6..9578666e98ba 100644
--- a/arch/microblaze/include/asm/pvr.h
+++ b/arch/microblaze/include/asm/pvr.h
@@ -16,7 +16,7 @@
#define PVR_MSR_BIT 0x400
struct pvr_s {
- unsigned pvr[16];
+ unsigned pvr[12];
};
/* The following taken from Xilinx's standalone BSP pvr.h */
diff --git a/arch/microblaze/include/asm/setup.h b/arch/microblaze/include/asm/setup.h
index 7f31394985e0..782b5c89248e 100644
--- a/arch/microblaze/include/asm/setup.h
+++ b/arch/microblaze/include/asm/setup.h
@@ -28,8 +28,6 @@ void disable_early_printk(void);
void heartbeat(void);
void setup_heartbeat(void);
-unsigned long long sched_clock(void);
-
# ifdef CONFIG_MMU
extern void mmu_reset(void);
extern void early_console_reg_tlb_alloc(unsigned int addr);
diff --git a/arch/microblaze/include/asm/system.h b/arch/microblaze/include/asm/system.h
index 81e1f7d5b4cb..e6a2284571dc 100644
--- a/arch/microblaze/include/asm/system.h
+++ b/arch/microblaze/include/asm/system.h
@@ -45,7 +45,6 @@ extern struct task_struct *_switch_to(struct thread_info *prev,
#define smp_rmb() rmb()
#define smp_wmb() wmb()
-void show_trace(struct task_struct *task, unsigned long *stack);
void __bad_xchg(volatile void *ptr, int size);
static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index 26460d15b338..d840f4a2d3c9 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -359,7 +359,7 @@ extern long __user_bad(void);
__copy_tofrom_user((__force void __user *)(to), \
(void __user *)(from), (n))
#define __copy_from_user_inatomic(to, from, n) \
- copy_from_user((to), (from), (n))
+ __copy_from_user((to), (from), (n))
static inline long copy_from_user(void *to,
const void __user *from, unsigned long n)
@@ -373,7 +373,7 @@ static inline long copy_from_user(void *to,
#define __copy_to_user(to, from, n) \
__copy_tofrom_user((void __user *)(to), \
(__force const void __user *)(from), (n))
-#define __copy_to_user_inatomic(to, from, n) copy_to_user((to), (from), (n))
+#define __copy_to_user_inatomic(to, from, n) __copy_to_user((to), (from), (n))
static inline long copy_to_user(void __user *to,
const void *from, unsigned long n)
diff --git a/arch/microblaze/include/asm/unwind.h b/arch/microblaze/include/asm/unwind.h
new file mode 100644
index 000000000000..d248b7de4b13
--- /dev/null
+++ b/arch/microblaze/include/asm/unwind.h
@@ -0,0 +1,29 @@
+/*
+ * Backtrace support for Microblaze
+ *
+ * Copyright (C) 2010 Digital Design Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef __MICROBLAZE_UNWIND_H
+#define __MICROBLAZE_UNWIND_H
+
+struct stack_trace;
+
+struct trap_handler_info {
+ unsigned long start_addr;
+ unsigned long end_addr;
+ const char *trap_name;
+};
+extern struct trap_handler_info microblaze_trap_handlers;
+
+extern const char _hw_exception_handler;
+extern const char ex_handler_unhandled;
+
+void microblaze_unwind(struct task_struct *task, struct stack_trace *trace);
+
+#endif /* __MICROBLAZE_UNWIND_H */
+
diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
index e51bc1520825..5eecc9f1fbd9 100644
--- a/arch/microblaze/kernel/Makefile
+++ b/arch/microblaze/kernel/Makefile
@@ -17,7 +17,7 @@ extra-y := head.o vmlinux.lds
obj-y += dma.o exceptions.o \
hw_exception_handler.o init_task.o intc.o irq.o of_device.o \
of_platform.o process.o prom.o prom_parse.o ptrace.o \
- setup.o signal.o sys_microblaze.o timer.o traps.o reset.o
+ reset.o setup.o signal.o sys_microblaze.o timer.o traps.o unwind.o
obj-y += cpu/
@@ -28,5 +28,6 @@ obj-$(CONFIG_MODULES) += microblaze_ksyms.o module.o
obj-$(CONFIG_MMU) += misc.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o mcount.o
+obj-$(CONFIG_KGDB) += kgdb.o
obj-y += entry$(MMU).o
diff --git a/arch/microblaze/kernel/cpu/mb.c b/arch/microblaze/kernel/cpu/mb.c
index 4216eb1eaa32..7086e3564281 100644
--- a/arch/microblaze/kernel/cpu/mb.c
+++ b/arch/microblaze/kernel/cpu/mb.c
@@ -126,6 +126,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
cpuinfo.pvr_user1,
cpuinfo.pvr_user2);
+ count += seq_printf(m, "Page size:\t%lu\n", PAGE_SIZE);
return 0;
}
diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
index 8cc18cd2cce6..ca84368570b6 100644
--- a/arch/microblaze/kernel/entry-nommu.S
+++ b/arch/microblaze/kernel/entry-nommu.S
@@ -588,3 +588,31 @@ sys_rt_sigsuspend_wrapper:
#include "syscall_table.S"
syscall_table_size=(.-sys_call_table)
+
+type_SYSCALL:
+ .ascii "SYSCALL\0"
+type_IRQ:
+ .ascii "IRQ\0"
+type_IRQ_PREEMPT:
+ .ascii "IRQ (PREEMPTED)\0"
+type_SYSCALL_PREEMPT:
+ .ascii " SYSCALL (PREEMPTED)\0"
+
+ /*
+ * Trap decoding for stack unwinder
+ * Tuples are (start addr, end addr, string)
+ * If return address lies on [start addr, end addr],
+ * unwinder displays 'string'
+ */
+
+ .align 4
+.global microblaze_trap_handlers
+microblaze_trap_handlers:
+ /* Exact matches come first */
+ .word ret_to_user ; .word ret_to_user ; .word type_SYSCALL
+ .word ret_from_intr; .word ret_from_intr ; .word type_IRQ
+ /* Fuzzy matches go here */
+ .word ret_from_intr; .word no_intr_resched; .word type_IRQ_PREEMPT
+ .word work_pending ; .word no_work_pending; .word type_SYSCALL_PREEMPT
+ /* End of table */
+ .word 0 ; .word 0 ; .word 0
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index c0ede25c5b99..304882e56459 100644
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -48,128 +48,107 @@
*/
#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
.macro clear_bip
- msrclr r11, MSR_BIP
- nop
+ msrclr r0, MSR_BIP
.endm
.macro set_bip
- msrset r11, MSR_BIP
- nop
+ msrset r0, MSR_BIP
.endm
.macro clear_eip
- msrclr r11, MSR_EIP
- nop
+ msrclr r0, MSR_EIP
.endm
.macro set_ee
- msrset r11, MSR_EE
- nop
+ msrset r0, MSR_EE
.endm
.macro disable_irq
- msrclr r11, MSR_IE
- nop
+ msrclr r0, MSR_IE
.endm
.macro enable_irq
- msrset r11, MSR_IE
- nop
+ msrset r0, MSR_IE
.endm
.macro set_ums
- msrset r11, MSR_UMS
- nop
- msrclr r11, MSR_VMS
- nop
+ msrset r0, MSR_UMS
+ msrclr r0, MSR_VMS
.endm
.macro set_vms
- msrclr r11, MSR_UMS
- nop
- msrset r11, MSR_VMS
- nop
+ msrclr r0, MSR_UMS
+ msrset r0, MSR_VMS
+ .endm
+
+ .macro clear_ums
+ msrclr r0, MSR_UMS
.endm
.macro clear_vms_ums
- msrclr r11, MSR_VMS
- nop
- msrclr r11, MSR_UMS
- nop
+ msrclr r0, MSR_VMS | MSR_UMS
.endm
#else
.macro clear_bip
mfs r11, rmsr
- nop
andi r11, r11, ~MSR_BIP
mts rmsr, r11
- nop
.endm
.macro set_bip
mfs r11, rmsr
- nop
ori r11, r11, MSR_BIP
mts rmsr, r11
- nop
.endm
.macro clear_eip
mfs r11, rmsr
- nop
andi r11, r11, ~MSR_EIP
mts rmsr, r11
- nop
.endm
.macro set_ee
mfs r11, rmsr
- nop
ori r11, r11, MSR_EE
mts rmsr, r11
- nop
.endm
.macro disable_irq
mfs r11, rmsr
- nop
andi r11, r11, ~MSR_IE
mts rmsr, r11
- nop
.endm
.macro enable_irq
mfs r11, rmsr
- nop
ori r11, r11, MSR_IE
mts rmsr, r11
- nop
.endm
.macro set_ums
mfs r11, rmsr
- nop
ori r11, r11, MSR_VMS
andni r11, r11, MSR_UMS
mts rmsr, r11
- nop
.endm
.macro set_vms
mfs r11, rmsr
- nop
ori r11, r11, MSR_VMS
andni r11, r11, MSR_UMS
mts rmsr, r11
- nop
+ .endm
+
+ .macro clear_ums
+ mfs r11, rmsr
+ andni r11, r11, MSR_UMS
+ mts rmsr,r11
.endm
.macro clear_vms_ums
mfs r11, rmsr
- nop
andni r11, r11, (MSR_VMS|MSR_UMS)
mts rmsr,r11
- nop
.endm
#endif
@@ -180,18 +159,22 @@
/* turn on virtual protected mode save */
#define VM_ON \
- set_ums; \
+ set_ums; \
rted r0, 2f; \
-2: nop;
+ nop; \
+2:
/* turn off virtual protected mode save and user mode save*/
#define VM_OFF \
- clear_vms_ums; \
+ clear_vms_ums; \
rted r0, TOPHYS(1f); \
-1: nop;
+ nop; \
+1:
#define SAVE_REGS \
swi r2, r1, PTO+PT_R2; /* Save SDA */ \
+ swi r3, r1, PTO+PT_R3; \
+ swi r4, r1, PTO+PT_R4; \
swi r5, r1, PTO+PT_R5; \
swi r6, r1, PTO+PT_R6; \
swi r7, r1, PTO+PT_R7; \
@@ -218,14 +201,14 @@
swi r30, r1, PTO+PT_R30; \
swi r31, r1, PTO+PT_R31; /* Save current task reg */ \
mfs r11, rmsr; /* save MSR */ \
- nop; \
swi r11, r1, PTO+PT_MSR;
#define RESTORE_REGS \
lwi r11, r1, PTO+PT_MSR; \
mts rmsr , r11; \
- nop; \
lwi r2, r1, PTO+PT_R2; /* restore SDA */ \
+ lwi r3, r1, PTO+PT_R3; \
+ lwi r4, r1, PTO+PT_R4; \
lwi r5, r1, PTO+PT_R5; \
lwi r6, r1, PTO+PT_R6; \
lwi r7, r1, PTO+PT_R7; \
@@ -252,6 +235,39 @@
lwi r30, r1, PTO+PT_R30; \
lwi r31, r1, PTO+PT_R31; /* Restore cur task reg */
+#define SAVE_STATE \
+ swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* save stack */ \
+ /* See if already in kernel mode.*/ \
+ mfs r1, rmsr; \
+ andi r1, r1, MSR_UMS; \
+ bnei r1, 1f; \
+ /* Kernel-mode state save. */ \
+ /* Reload kernel stack-ptr. */ \
+ lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); \
+ /* FIXME: I can add these two lines to one */ \
+ /* tophys(r1,r1); */ \
+ /* addik r1, r1, -STATE_SAVE_SIZE; */ \
+ addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE; \
+ SAVE_REGS \
+ brid 2f; \
+ swi r1, r1, PTO+PT_MODE; \
+1: /* User-mode state save. */ \
+ lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */\
+ tophys(r1,r1); \
+ lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ \
+ /* MS these three instructions can be added to one */ \
+ /* addik r1, r1, THREAD_SIZE; */ \
+ /* tophys(r1,r1); */ \
+ /* addik r1, r1, -STATE_SAVE_SIZE; */ \
+ addik r1, r1, THREAD_SIZE + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE; \
+ SAVE_REGS \
+ lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \
+ swi r11, r1, PTO+PT_R1; /* Store user SP. */ \
+ swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ \
+ /* MS: I am clearing UMS even in case when I come from kernel space */ \
+ clear_ums; \
+2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
+
.text
/*
@@ -267,45 +283,23 @@
* are masked. This is nice, means we don't have to CLI before state save
*/
C_ENTRY(_user_exception):
- swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
addi r14, r14, 4 /* return address is 4 byte after call */
- swi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* Save r11 */
-
- lwi r11, r0, TOPHYS(PER_CPU(KM));/* See if already in kernel mode.*/
- beqi r11, 1f; /* Jump ahead if coming from user */
-/* Kernel-mode state save. */
- lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
- tophys(r1,r11);
- swi r11, r1, (PT_R1-PT_SIZE); /* Save original SP. */
- lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */
-
- addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
- SAVE_REGS
-
- addi r11, r0, 1; /* Was in kernel-mode. */
- swi r11, r1, PTO+PT_MODE; /* pt_regs -> kernel mode */
- brid 2f;
- nop; /* Fill delay slot */
+ swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
-/* User-mode state save. */
-1:
- lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */
lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
tophys(r1,r1);
lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */
-/* calculate kernel stack pointer from task struct 8k */
- addik r1, r1, THREAD_SIZE;
- tophys(r1,r1);
-
- addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
+ /* MS these three instructions can be added to one */
+ /* addik r1, r1, THREAD_SIZE; */
+ /* tophys(r1,r1); */
+ /* addik r1, r1, -STATE_SAVE_SIZE; */
+ addik r1, r1, THREAD_SIZE + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE;
SAVE_REGS
- swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
swi r11, r1, PTO+PT_R1; /* Store user SP. */
- addi r11, r0, 1;
- swi r11, r0, TOPHYS(PER_CPU(KM)); /* Now we're in kernel-mode. */
-2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
+ clear_ums;
+ lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
/* Save away the syscall number. */
swi r12, r1, PTO+PT_R0;
tovirt(r1,r1)
@@ -316,10 +310,8 @@ C_ENTRY(_user_exception):
* register should point to the location where
* the called function should return. [note that MAKE_SYS_CALL uses label 1] */
- # Step into virtual mode.
- set_vms;
- addik r11, r0, 3f
- rtid r11, 0
+ /* Step into virtual mode */
+ rtbd r0, 3f
nop
3:
lwi r11, CURRENT_TASK, TS_THREAD_INFO /* get thread info */
@@ -363,24 +355,17 @@ C_ENTRY(_user_exception):
# Find and jump into the syscall handler.
lwi r12, r12, sys_call_table
/* where the trap should return need -8 to adjust for rtsd r15, 8 */
- la r15, r0, ret_from_trap-8
+ addi r15, r0, ret_from_trap-8
bra r12
/* The syscall number is invalid, return an error. */
5:
+ rtsd r15, 8; /* looks like a normal subroutine return */
addi r3, r0, -ENOSYS;
- rtsd r15,8; /* looks like a normal subroutine return */
- or r0, r0, r0
-
/* Entry point used to return from a syscall/trap */
/* We re-enable BIP bit before state restore */
C_ENTRY(ret_from_trap):
- set_bip; /* Ints masked for state restore*/
- lwi r11, r1, PTO+PT_MODE;
-/* See if returning to kernel mode, if so, skip resched &c. */
- bnei r11, 2f;
-
swi r3, r1, PTO + PT_R3
swi r4, r1, PTO + PT_R4
@@ -413,32 +398,19 @@ C_ENTRY(ret_from_trap):
andi r11, r11, _TIF_SIGPENDING;
beqi r11, 1f; /* Signals to handle, handle them */
- la r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
+ addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
addi r7, r0, 1; /* Arg 3: int in_syscall */
bralid r15, do_signal; /* Handle any signals */
add r6, r0, r0; /* Arg 2: sigset_t *oldset */
/* Finally, return to user state. */
-1:
- lwi r3, r1, PTO + PT_R3; /* restore syscall result */
- lwi r4, r1, PTO + PT_R4;
-
- swi r0, r0, PER_CPU(KM); /* Now officially in user state. */
+1: set_bip; /* Ints masked for state restore */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
RESTORE_REGS;
addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */
lwi r1, r1, PT_R1 - PT_SIZE;/* Restore user stack pointer. */
- bri 6f;
-
-/* Return to kernel state. */
-2: VM_OFF;
- tophys(r1,r1);
- RESTORE_REGS;
- addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */
- tovirt(r1,r1);
-6:
TRAP_return: /* Make global symbol for debugging */
rtbd r14, 0; /* Instructions to return from an IRQ */
nop;
@@ -450,12 +422,11 @@ TRAP_return: /* Make global symbol for debugging */
C_ENTRY(sys_fork_wrapper):
addi r5, r0, SIGCHLD /* Arg 0: flags */
lwi r6, r1, PTO+PT_R1 /* Arg 1: child SP (use parent's) */
- la r7, r1, PTO /* Arg 2: parent context */
+ addik r7, r1, PTO /* Arg 2: parent context */
add r8. r0, r0 /* Arg 3: (unused) */
add r9, r0, r0; /* Arg 4: (unused) */
- add r10, r0, r0; /* Arg 5: (unused) */
brid do_fork /* Do real work (tail-call) */
- nop;
+ add r10, r0, r0; /* Arg 5: (unused) */
/* This the initial entry point for a new child thread, with an appropriate
stack in place that makes it look the the child is in the middle of an
@@ -466,35 +437,31 @@ C_ENTRY(ret_from_fork):
bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
add r3, r5, r0; /* switch_thread returns the prev task */
/* ( in the delay slot ) */
- add r3, r0, r0; /* Child's fork call should return 0. */
brid ret_from_trap; /* Do normal trap return */
- nop;
+ add r3, r0, r0; /* Child's fork call should return 0. */
C_ENTRY(sys_vfork):
brid microblaze_vfork /* Do real work (tail-call) */
- la r5, r1, PTO
+ addik r5, r1, PTO
C_ENTRY(sys_clone):
bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */
- lwi r6, r1, PTO+PT_R1; /* If so, use paret's stack ptr */
-1: la r7, r1, PTO; /* Arg 2: parent context */
+ lwi r6, r1, PTO + PT_R1; /* If so, use paret's stack ptr */
+1: addik r7, r1, PTO; /* Arg 2: parent context */
add r8, r0, r0; /* Arg 3: (unused) */
add r9, r0, r0; /* Arg 4: (unused) */
- add r10, r0, r0; /* Arg 5: (unused) */
brid do_fork /* Do real work (tail-call) */
- nop;
+ add r10, r0, r0; /* Arg 5: (unused) */
C_ENTRY(sys_execve):
- la r8, r1, PTO; /* add user context as 4th arg */
brid microblaze_execve; /* Do real work (tail-call).*/
- nop;
+ addik r8, r1, PTO; /* add user context as 4th arg */
C_ENTRY(sys_rt_sigreturn_wrapper):
swi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
swi r4, r1, PTO+PT_R4;
- la r5, r1, PTO; /* add user context as 1st arg */
brlid r15, sys_rt_sigreturn /* Do real work */
- nop;
+ addik r5, r1, PTO; /* add user context as 1st arg */
lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
lwi r4, r1, PTO+PT_R4;
bri ret_from_trap /* fall through will not work here due to align */
@@ -503,83 +470,23 @@ C_ENTRY(sys_rt_sigreturn_wrapper):
/*
* HW EXCEPTION rutine start
*/
-
-#define SAVE_STATE \
- swi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* Save r11 */ \
- set_bip; /*equalize initial state for all possible entries*/\
- clear_eip; \
- enable_irq; \
- set_ee; \
- /* See if already in kernel mode.*/ \
- lwi r11, r0, TOPHYS(PER_CPU(KM)); \
- beqi r11, 1f; /* Jump ahead if coming from user */\
- /* Kernel-mode state save. */ \
- /* Reload kernel stack-ptr. */ \
- lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \
- tophys(r1,r11); \
- swi r11, r1, (PT_R1-PT_SIZE); /* Save original SP. */ \
- lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */\
- addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\
- /* store return registers separately because \
- * this macros is use for others exceptions */ \
- swi r3, r1, PTO + PT_R3; \
- swi r4, r1, PTO + PT_R4; \
- SAVE_REGS \
- /* PC, before IRQ/trap - this is one instruction above */ \
- swi r17, r1, PTO+PT_PC; \
- \
- addi r11, r0, 1; /* Was in kernel-mode. */ \
- swi r11, r1, PTO+PT_MODE; \
- brid 2f; \
- nop; /* Fill delay slot */ \
-1: /* User-mode state save. */ \
- lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */\
- lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */\
- tophys(r1,r1); \
- lwi r1, r1, TS_THREAD_INFO; /* get the thread info */ \
- addik r1, r1, THREAD_SIZE; /* calculate kernel stack pointer */\
- tophys(r1,r1); \
- \
- addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */\
- /* store return registers separately because this macros \
- * is use for others exceptions */ \
- swi r3, r1, PTO + PT_R3; \
- swi r4, r1, PTO + PT_R4; \
- SAVE_REGS \
- /* PC, before IRQ/trap - this is one instruction above FIXME*/ \
- swi r17, r1, PTO+PT_PC; \
- \
- swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */ \
- lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \
- swi r11, r1, PTO+PT_R1; /* Store user SP. */ \
- addi r11, r0, 1; \
- swi r11, r0, TOPHYS(PER_CPU(KM)); /* Now we're in kernel-mode.*/\
-2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); \
- /* Save away the syscall number. */ \
- swi r0, r1, PTO+PT_R0; \
- tovirt(r1,r1)
-
C_ENTRY(full_exception_trap):
- swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
/* adjust exception address for privileged instruction
* for finding where is it */
addik r17, r17, -4
SAVE_STATE /* Save registers */
+ /* PC, before IRQ/trap - this is one instruction above */
+ swi r17, r1, PTO+PT_PC;
+ tovirt(r1,r1)
/* FIXME this can be store directly in PT_ESR reg.
* I tested it but there is a fault */
/* where the trap should return need -8 to adjust for rtsd r15, 8 */
- la r15, r0, ret_from_exc - 8
- la r5, r1, PTO /* parameter struct pt_regs * regs */
+ addik r15, r0, ret_from_exc - 8
mfs r6, resr
- nop
mfs r7, rfsr; /* save FSR */
- nop
mts rfsr, r0; /* Clear sticky fsr */
- nop
- la r12, r0, full_exception
- set_vms;
- rtbd r12, 0;
- nop;
+ rted r0, full_exception
+ addik r5, r1, PTO /* parameter struct pt_regs * regs */
/*
* Unaligned data trap.
@@ -592,19 +499,27 @@ C_ENTRY(full_exception_trap):
* The assembler routine is in "arch/microblaze/kernel/hw_exception_handler.S"
*/
C_ENTRY(unaligned_data_trap):
- swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
+ /* MS: I have to save r11 value and then restore it because
+ * set_bit, clear_eip, set_ee use r11 as temp register if MSR
+ * instructions are not used. We don't need to do if MSR instructions
+ * are used and they use r0 instead of r11.
+ * I am using ENTRY_SP which should be primary used only for stack
+ * pointer saving. */
+ swi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
+ set_bip; /* equalize initial state for all possible entries */
+ clear_eip;
+ set_ee;
+ lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
SAVE_STATE /* Save registers.*/
+ /* PC, before IRQ/trap - this is one instruction above */
+ swi r17, r1, PTO+PT_PC;
+ tovirt(r1,r1)
/* where the trap should return need -8 to adjust for rtsd r15, 8 */
- la r15, r0, ret_from_exc-8
+ addik r15, r0, ret_from_exc-8
mfs r3, resr /* ESR */
- nop
mfs r4, rear /* EAR */
- nop
- la r7, r1, PTO /* parameter struct pt_regs * regs */
- la r12, r0, _unaligned_data_exception
- set_vms;
- rtbd r12, 0; /* interrupts enabled */
- nop;
+ rtbd r0, _unaligned_data_exception
+ addik r7, r1, PTO /* parameter struct pt_regs * regs */
/*
* Page fault traps.
@@ -625,38 +540,32 @@ C_ENTRY(unaligned_data_trap):
*/
/* data and intruction trap - which is choose is resolved int fault.c */
C_ENTRY(page_fault_data_trap):
- swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
SAVE_STATE /* Save registers.*/
+ /* PC, before IRQ/trap - this is one instruction above */
+ swi r17, r1, PTO+PT_PC;
+ tovirt(r1,r1)
/* where the trap should return need -8 to adjust for rtsd r15, 8 */
- la r15, r0, ret_from_exc-8
- la r5, r1, PTO /* parameter struct pt_regs * regs */
+ addik r15, r0, ret_from_exc-8
mfs r6, rear /* parameter unsigned long address */
- nop
mfs r7, resr /* parameter unsigned long error_code */
- nop
- la r12, r0, do_page_fault
- set_vms;
- rtbd r12, 0; /* interrupts enabled */
- nop;
+ rted r0, do_page_fault
+ addik r5, r1, PTO /* parameter struct pt_regs * regs */
C_ENTRY(page_fault_instr_trap):
- swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
SAVE_STATE /* Save registers.*/
+ /* PC, before IRQ/trap - this is one instruction above */
+ swi r17, r1, PTO+PT_PC;
+ tovirt(r1,r1)
/* where the trap should return need -8 to adjust for rtsd r15, 8 */
- la r15, r0, ret_from_exc-8
- la r5, r1, PTO /* parameter struct pt_regs * regs */
+ addik r15, r0, ret_from_exc-8
mfs r6, rear /* parameter unsigned long address */
- nop
ori r7, r0, 0 /* parameter unsigned long error_code */
- la r12, r0, do_page_fault
- set_vms;
- rtbd r12, 0; /* interrupts enabled */
- nop;
+ rted r0, do_page_fault
+ addik r5, r1, PTO /* parameter struct pt_regs * regs */
/* Entry point used to return from an exception. */
C_ENTRY(ret_from_exc):
- set_bip; /* Ints masked for state restore*/
- lwi r11, r1, PTO+PT_MODE;
+ lwi r11, r1, PTO + PT_MODE;
bnei r11, 2f; /* See if returning to kernel mode, */
/* ... if so, skip resched &c. */
@@ -687,32 +596,27 @@ C_ENTRY(ret_from_exc):
* traps), but signal handlers may want to examine or change the
* complete register state. Here we save anything not saved by
* the normal entry sequence, so that it may be safely restored
- * (in a possibly modified form) after do_signal returns.
- * store return registers separately because this macros is use
- * for others exceptions */
- la r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
+ * (in a possibly modified form) after do_signal returns. */
+ addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
addi r7, r0, 0; /* Arg 3: int in_syscall */
bralid r15, do_signal; /* Handle any signals */
add r6, r0, r0; /* Arg 2: sigset_t *oldset */
/* Finally, return to user state. */
-1: swi r0, r0, PER_CPU(KM); /* Now officially in user state. */
+1: set_bip; /* Ints masked for state restore */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
- lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
- lwi r4, r1, PTO+PT_R4;
RESTORE_REGS;
addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */
lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer. */
bri 6f;
/* Return to kernel state. */
-2: VM_OFF;
+2: set_bip; /* Ints masked for state restore */
+ VM_OFF;
tophys(r1,r1);
- lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
- lwi r4, r1, PTO+PT_R4;
RESTORE_REGS;
addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */
@@ -736,36 +640,23 @@ C_ENTRY(_interrupt):
/* MS: we are in physical address */
/* Save registers, switch to proper stack, convert SP to virtual.*/
swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP))
- swi r11, r0, TOPHYS(PER_CPU(R11_SAVE));
/* MS: See if already in kernel mode. */
- lwi r11, r0, TOPHYS(PER_CPU(KM));
- beqi r11, 1f; /* MS: Jump ahead if coming from user */
+ mfs r1, rmsr
+ nop
+ andi r1, r1, MSR_UMS
+ bnei r1, 1f
/* Kernel-mode state save. */
- or r11, r1, r0
- tophys(r1,r11); /* MS: I have in r1 physical address where stack is */
-/* MS: Save original SP - position PT_R1 to next stack frame 4 *1 - 152*/
- swi r11, r1, (PT_R1 - PT_SIZE);
-/* MS: restore r11 because of saving in SAVE_REGS */
- lwi r11, r0, TOPHYS(PER_CPU(R11_SAVE));
+ lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP))
+ tophys(r1,r1); /* MS: I have in r1 physical address where stack is */
/* save registers */
/* MS: Make room on the stack -> activation record */
addik r1, r1, -STATE_SAVE_SIZE;
-/* MS: store return registers separately because
- * this macros is use for others exceptions */
- swi r3, r1, PTO + PT_R3;
- swi r4, r1, PTO + PT_R4;
SAVE_REGS
- /* MS: store mode */
- addi r11, r0, 1; /* MS: Was in kernel-mode. */
- swi r11, r1, PTO + PT_MODE; /* MS: and save it */
brid 2f;
- nop; /* MS: Fill delay slot */
-
+ swi r1, r1, PTO + PT_MODE; /* 0 - user mode, 1 - kernel mode */
1:
/* User-mode state save. */
-/* MS: restore r11 -> FIXME move before SAVE_REG */
- lwi r11, r0, TOPHYS(PER_CPU(R11_SAVE));
/* MS: get the saved current */
lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
tophys(r1,r1);
@@ -774,27 +665,18 @@ C_ENTRY(_interrupt):
tophys(r1,r1);
/* save registers */
addik r1, r1, -STATE_SAVE_SIZE;
- swi r3, r1, PTO+PT_R3;
- swi r4, r1, PTO+PT_R4;
SAVE_REGS
/* calculate mode */
swi r0, r1, PTO + PT_MODE;
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
swi r11, r1, PTO+PT_R1;
- /* setup kernel mode to KM */
- addi r11, r0, 1;
- swi r11, r0, TOPHYS(PER_CPU(KM));
-
+ clear_ums;
2:
lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
- swi r0, r1, PTO + PT_R0;
tovirt(r1,r1)
- la r5, r1, PTO;
- set_vms;
- la r11, r0, do_IRQ;
- la r15, r0, irq_call;
-irq_call:rtbd r11, 0;
- nop;
+ addik r15, r0, irq_call;
+irq_call:rtbd r0, do_IRQ;
+ addik r5, r1, PTO;
/* MS: we are in virtual mode */
ret_from_irq:
@@ -815,7 +697,7 @@ ret_from_irq:
beqid r11, no_intr_resched
/* Handle a signal return; Pending signals should be in r18. */
addi r7, r0, 0; /* Arg 3: int in_syscall */
- la r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
+ addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
bralid r15, do_signal; /* Handle any signals */
add r6, r0, r0; /* Arg 2: sigset_t *oldset */
@@ -823,12 +705,9 @@ ret_from_irq:
no_intr_resched:
/* Disable interrupts, we are now committed to the state restore */
disable_irq
- swi r0, r0, PER_CPU(KM); /* MS: Now officially in user state. */
swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE);
VM_OFF;
tophys(r1,r1);
- lwi r3, r1, PTO + PT_R3; /* MS: restore saved r3, r4 registers */
- lwi r4, r1, PTO + PT_R4;
RESTORE_REGS
addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */
lwi r1, r1, PT_R1 - PT_SIZE;
@@ -857,8 +736,6 @@ restore:
#endif
VM_OFF /* MS: turn off MMU */
tophys(r1,r1)
- lwi r3, r1, PTO + PT_R3; /* MS: restore saved r3, r4 registers */
- lwi r4, r1, PTO + PT_R4;
RESTORE_REGS
addik r1, r1, STATE_SAVE_SIZE /* MS: Clean up stack space. */
tovirt(r1,r1);
@@ -868,86 +745,91 @@ IRQ_return: /* MS: Make global symbol for debugging */
nop
/*
- * `Debug' trap
- * We enter dbtrap in "BIP" (breakpoint) mode.
- * So we exit the breakpoint mode with an 'rtbd' and proceed with the
- * original dbtrap.
- * however, wait to save state first
+ * Debug trap for KGDB. Enter to _debug_exception by brki r16, 0x18
+ * and call handling function with saved pt_regs
*/
C_ENTRY(_debug_exception):
/* BIP bit is set on entry, no interrupts can occur */
swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP))
- swi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* Save r11 */
- set_bip; /*equalize initial state for all possible entries*/
- clear_eip;
- enable_irq;
- lwi r11, r0, TOPHYS(PER_CPU(KM));/* See if already in kernel mode.*/
- beqi r11, 1f; /* Jump ahead if coming from user */
- /* Kernel-mode state save. */
- lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
- tophys(r1,r11);
- swi r11, r1, (PT_R1-PT_SIZE); /* Save original SP. */
- lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */
+ mfs r1, rmsr
+ nop
+ andi r1, r1, MSR_UMS
+ bnei r1, 1f
+/* MS: Kernel-mode state save - kgdb */
+ lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
- addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
- swi r3, r1, PTO + PT_R3;
- swi r4, r1, PTO + PT_R4;
+ /* BIP bit is set on entry, no interrupts can occur */
+ addik r1, r1, CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START - STATE_SAVE_SIZE;
SAVE_REGS;
+ /* save all regs to pt_reg structure */
+ swi r0, r1, PTO+PT_R0; /* R0 must be saved too */
+ swi r14, r1, PTO+PT_R14 /* rewrite saved R14 value */
+ swi r16, r1, PTO+PT_R16
+ swi r16, r1, PTO+PT_PC; /* PC and r16 are the same */
+ swi r17, r1, PTO+PT_R17
+ /* save special purpose registers to pt_regs */
+ mfs r11, rear;
+ swi r11, r1, PTO+PT_EAR;
+ mfs r11, resr;
+ swi r11, r1, PTO+PT_ESR;
+ mfs r11, rfsr;
+ swi r11, r1, PTO+PT_FSR;
+
+ /* stack pointer is in physical address at it is decrease
+ * by STATE_SAVE_SIZE but we need to get correct R1 value */
+ addik r11, r1, CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR + STATE_SAVE_SIZE;
+ swi r11, r1, PTO+PT_R1
+ /* MS: r31 - current pointer isn't changed */
+ tovirt(r1,r1)
+#ifdef CONFIG_KGDB
+ addi r5, r1, PTO /* pass pt_reg address as the first arg */
+ la r15, r0, dbtrap_call; /* return address */
+ rtbd r0, microblaze_kgdb_break
+ nop;
+#endif
+ /* MS: Place handler for brki from kernel space if KGDB is OFF.
+ * It is very unlikely that another brki instruction is called. */
+ bri 0
- addi r11, r0, 1; /* Was in kernel-mode. */
- swi r11, r1, PTO + PT_MODE;
- brid 2f;
- nop; /* Fill delay slot */
-1: /* User-mode state save. */
- lwi r11, r0, TOPHYS(r0_ram + PTO + PT_R11); /* restore r11 */
- lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
+/* MS: User-mode state save - gdb */
+1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
tophys(r1,r1);
lwi r1, r1, TS_THREAD_INFO; /* get the thread info */
addik r1, r1, THREAD_SIZE; /* calculate kernel stack pointer */
tophys(r1,r1);
addik r1, r1, -STATE_SAVE_SIZE; /* Make room on the stack. */
- swi r3, r1, PTO + PT_R3;
- swi r4, r1, PTO + PT_R4;
SAVE_REGS;
-
- swi r0, r1, PTO+PT_MODE; /* Was in user-mode. */
+ swi r17, r1, PTO+PT_R17;
+ swi r16, r1, PTO+PT_R16;
+ swi r16, r1, PTO+PT_PC; /* Save LP */
+ swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP));
swi r11, r1, PTO+PT_R1; /* Store user SP. */
- addi r11, r0, 1;
- swi r11, r0, TOPHYS(PER_CPU(KM)); /* Now we're in kernel-mode. */
-2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
- /* Save away the syscall number. */
- swi r0, r1, PTO+PT_R0;
+ lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
tovirt(r1,r1)
-
- addi r5, r0, SIGTRAP /* send the trap signal */
- add r6, r0, CURRENT_TASK; /* Get current task ptr into r11 */
- addk r7, r0, r0 /* 3rd param zero */
-
set_vms;
- la r11, r0, send_sig;
- la r15, r0, dbtrap_call;
-dbtrap_call: rtbd r11, 0;
- nop;
+ addik r5, r1, PTO;
+ addik r15, r0, dbtrap_call;
+dbtrap_call: /* Return point for kernel/user entry + 8 because of rtsd r15, 8 */
+ rtbd r0, sw_exception
+ nop
- set_bip; /* Ints masked for state restore*/
- lwi r11, r1, PTO+PT_MODE;
+ /* MS: The first instruction for the second part of the gdb/kgdb */
+ set_bip; /* Ints masked for state restore */
+ lwi r11, r1, PTO + PT_MODE;
bnei r11, 2f;
-
+/* MS: Return to user space - gdb */
/* Get current task ptr into r11 */
lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
lwi r11, r11, TI_FLAGS; /* get flags in thread info */
andi r11, r11, _TIF_NEED_RESCHED;
beqi r11, 5f;
-/* Call the scheduler before returning from a syscall/trap. */
-
+ /* Call the scheduler before returning from a syscall/trap. */
bralid r15, schedule; /* Call scheduler */
nop; /* delay slot */
- /* XXX Is PT_DTRACE handling needed here? */
- /* XXX m68knommu also checks TASK_STATE & TASK_COUNTER here. */
/* Maybe handle a signal */
5: lwi r11, CURRENT_TASK, TS_THREAD_INFO; /* get thread info */
@@ -955,54 +837,40 @@ dbtrap_call: rtbd r11, 0;
andi r11, r11, _TIF_SIGPENDING;
beqi r11, 1f; /* Signals to handle, handle them */
-/* Handle a signal return; Pending signals should be in r18. */
- /* Not all registers are saved by the normal trap/interrupt entry
- points (for instance, call-saved registers (because the normal
- C-compiler calling sequence in the kernel makes sure they're
- preserved), and call-clobbered registers in the case of
- traps), but signal handlers may want to examine or change the
- complete register state. Here we save anything not saved by
- the normal entry sequence, so that it may be safely restored
- (in a possibly modified form) after do_signal returns. */
-
- la r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
+ addik r5, r1, PTO; /* Arg 1: struct pt_regs *regs */
addi r7, r0, 0; /* Arg 3: int in_syscall */
bralid r15, do_signal; /* Handle any signals */
add r6, r0, r0; /* Arg 2: sigset_t *oldset */
-
/* Finally, return to user state. */
-1: swi r0, r0, PER_CPU(KM); /* Now officially in user state. */
- swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
+1: swi CURRENT_TASK, r0, PER_CPU(CURRENT_SAVE); /* save current */
VM_OFF;
tophys(r1,r1);
-
- lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
- lwi r4, r1, PTO+PT_R4;
+ /* MS: Restore all regs */
RESTORE_REGS
- addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */
-
-
- lwi r1, r1, PT_R1 - PT_SIZE;
- /* Restore user stack pointer. */
- bri 6f;
+ lwi r17, r1, PTO+PT_R17;
+ lwi r16, r1, PTO+PT_R16;
+ addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space */
+ lwi r1, r1, PT_R1 - PT_SIZE; /* Restore user stack pointer */
+DBTRAP_return_user: /* MS: Make global symbol for debugging */
+ rtbd r16, 0; /* MS: Instructions to return from a debug trap */
+ nop;
-/* Return to kernel state. */
+/* MS: Return to kernel state - kgdb */
2: VM_OFF;
tophys(r1,r1);
- lwi r3, r1, PTO+PT_R3; /* restore saved r3, r4 registers */
- lwi r4, r1, PTO+PT_R4;
+ /* MS: Restore all regs */
RESTORE_REGS
- addik r1, r1, STATE_SAVE_SIZE /* Clean up stack space. */
-
+ lwi r14, r1, PTO+PT_R14;
+ lwi r16, r1, PTO+PT_PC;
+ lwi r17, r1, PTO+PT_R17;
+ addik r1, r1, STATE_SAVE_SIZE; /* MS: Clean up stack space */
tovirt(r1,r1);
-6:
-DBTRAP_return: /* Make global symbol for debugging */
- rtbd r14, 0; /* Instructions to return from an IRQ */
+DBTRAP_return_kernel: /* MS: Make global symbol for debugging */
+ rtbd r16, 0; /* MS: Instructions to return from a debug trap */
nop;
-
ENTRY(_switch_to)
/* prepare return value */
addk r3, r0, CURRENT_TASK
@@ -1037,16 +905,12 @@ ENTRY(_switch_to)
swi r30, r11, CC_R30
/* special purpose registers */
mfs r12, rmsr
- nop
swi r12, r11, CC_MSR
mfs r12, rear
- nop
swi r12, r11, CC_EAR
mfs r12, resr
- nop
swi r12, r11, CC_ESR
mfs r12, rfsr
- nop
swi r12, r11, CC_FSR
/* update r31, the current-give me pointer to task which will be next */
@@ -1085,10 +949,8 @@ ENTRY(_switch_to)
/* special purpose registers */
lwi r12, r11, CC_FSR
mts rfsr, r12
- nop
lwi r12, r11, CC_MSR
mts rmsr, r12
- nop
rtsd r15, 8
nop
@@ -1096,15 +958,6 @@ ENTRY(_switch_to)
ENTRY(_reset)
brai 0x70; /* Jump back to FS-boot */
-ENTRY(_break)
- mfs r5, rmsr
- nop
- swi r5, r0, 0x250 + TOPHYS(r0_ram)
- mfs r5, resr
- nop
- swi r5, r0, 0x254 + TOPHYS(r0_ram)
- bri 0
-
/* These are compiled and loaded into high memory, then
* copied into place in mach_early_setup */
.section .init.ivt, "ax"
@@ -1116,14 +969,38 @@ ENTRY(_break)
nop
brai TOPHYS(_user_exception); /* syscall handler */
brai TOPHYS(_interrupt); /* Interrupt handler */
- brai TOPHYS(_break); /* nmi trap handler */
+ brai TOPHYS(_debug_exception); /* debug trap handler */
brai TOPHYS(_hw_exception_handler); /* HW exception handler */
- .org 0x60
- brai TOPHYS(_debug_exception); /* debug trap handler*/
-
.section .rodata,"a"
#include "syscall_table.S"
syscall_table_size=(.-sys_call_table)
+type_SYSCALL:
+ .ascii "SYSCALL\0"
+type_IRQ:
+ .ascii "IRQ\0"
+type_IRQ_PREEMPT:
+ .ascii "IRQ (PREEMPTED)\0"
+type_SYSCALL_PREEMPT:
+ .ascii " SYSCALL (PREEMPTED)\0"
+
+ /*
+ * Trap decoding for stack unwinder
+ * Tuples are (start addr, end addr, string)
+ * If return address lies on [start addr, end addr],
+ * unwinder displays 'string'
+ */
+
+ .align 4
+.global microblaze_trap_handlers
+microblaze_trap_handlers:
+ /* Exact matches come first */
+ .word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL
+ .word ret_from_irq ; .word ret_from_irq ; .word type_IRQ
+ /* Fuzzy matches go here */
+ .word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT
+ .word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT
+ /* End of table */
+ .word 0 ; .word 0 ; .word 0
diff --git a/arch/microblaze/kernel/exceptions.c b/arch/microblaze/kernel/exceptions.c
index 02cbdfe5aa8d..b98ee8d0c1cd 100644
--- a/arch/microblaze/kernel/exceptions.c
+++ b/arch/microblaze/kernel/exceptions.c
@@ -48,12 +48,17 @@ void die(const char *str, struct pt_regs *fp, long err)
do_exit(err);
}
+/* for user application debugging */
+void sw_exception(struct pt_regs *regs)
+{
+ _exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16);
+}
+
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
{
siginfo_t info;
if (kernel_mode(regs)) {
- debugger(regs);
die("Exception in kernel mode", regs, signr);
}
info.si_signo = signr;
@@ -143,7 +148,7 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
#ifdef CONFIG_MMU
case MICROBLAZE_PRIVILEGED_EXCEPTION:
pr_debug(KERN_WARNING "Privileged exception\n");
- /* "brk r0,r0" - used as debug breakpoint */
+ /* "brk r0,r0" - used as debug breakpoint - old toolchain */
if (get_user(code, (unsigned long *)regs->pc) == 0
&& code == 0x980c0000) {
_exception(SIGTRAP, regs, TRAP_BRKPT, addr);
diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S
index 1bf739888260..42434008209e 100644
--- a/arch/microblaze/kernel/head.S
+++ b/arch/microblaze/kernel/head.S
@@ -43,10 +43,10 @@
.global empty_zero_page
.align 12
empty_zero_page:
- .space 4096
+ .space PAGE_SIZE
.global swapper_pg_dir
swapper_pg_dir:
- .space 4096
+ .space PAGE_SIZE
#endif /* CONFIG_MMU */
diff --git a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S
index 995a2123635b..781195438ee6 100644
--- a/arch/microblaze/kernel/hw_exception_handler.S
+++ b/arch/microblaze/kernel/hw_exception_handler.S
@@ -78,9 +78,6 @@
#include <asm/asm-offsets.h>
/* Helpful Macros */
-#ifndef CONFIG_MMU
-#define EX_HANDLER_STACK_SIZ (4*19)
-#endif
#define NUM_TO_REG(num) r ## num
#ifdef CONFIG_MMU
@@ -988,6 +985,7 @@ ex_unaligned_fixup:
.end _unaligned_data_exception
#endif /* CONFIG_MMU */
+.global ex_handler_unhandled
ex_handler_unhandled:
/* FIXME add handle function for unhandled exception - dump register */
bri 0
diff --git a/arch/microblaze/kernel/irq.c b/arch/microblaze/kernel/irq.c
index 8f120aca123d..598f1fd61c89 100644
--- a/arch/microblaze/kernel/irq.c
+++ b/arch/microblaze/kernel/irq.c
@@ -37,6 +37,7 @@ void __irq_entry do_IRQ(struct pt_regs *regs)
{
unsigned int irq;
struct pt_regs *old_regs = set_irq_regs(regs);
+ trace_hardirqs_off();
irq_enter();
irq = get_irq(regs);
@@ -53,6 +54,7 @@ next_irq:
irq_exit();
set_irq_regs(old_regs);
+ trace_hardirqs_on();
}
int show_interrupts(struct seq_file *p, void *v)
diff --git a/arch/microblaze/kernel/kgdb.c b/arch/microblaze/kernel/kgdb.c
new file mode 100644
index 000000000000..bfc006b7f2d8
--- /dev/null
+++ b/arch/microblaze/kernel/kgdb.c
@@ -0,0 +1,147 @@
+/*
+ * Microblaze KGDB support
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <asm/cacheflush.h>
+#include <asm/asm-offsets.h>
+#include <asm/pvr.h>
+
+#define GDB_REG 0
+#define GDB_PC 32
+#define GDB_MSR 33
+#define GDB_EAR 34
+#define GDB_ESR 35
+#define GDB_FSR 36
+#define GDB_BTR 37
+#define GDB_PVR 38
+#define GDB_REDR 50
+#define GDB_RPID 51
+#define GDB_RZPR 52
+#define GDB_RTLBX 53
+#define GDB_RTLBSX 54 /* mfs can't read it */
+#define GDB_RTLBLO 55
+#define GDB_RTLBHI 56
+
+/* keep pvr separately because it is unchangeble */
+struct pvr_s pvr;
+
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int i;
+ unsigned long *pt_regb = (unsigned long *)regs;
+ int temp;
+ /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */
+ for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++)
+ gdb_regs[i] = pt_regb[i];
+
+ /* Branch target register can't be changed */
+ __asm__ __volatile__ ("mfs %0, rbtr;" : "=r"(temp) : );
+ gdb_regs[GDB_BTR] = temp;
+
+ /* pvr part - we have 11 pvr regs */
+ for (i = 0; i < sizeof(struct pvr_s)/4; i++)
+ gdb_regs[GDB_PVR + i] = pvr.pvr[i];
+
+ /* read special registers - can't be changed */
+ __asm__ __volatile__ ("mfs %0, redr;" : "=r"(temp) : );
+ gdb_regs[GDB_REDR] = temp;
+ __asm__ __volatile__ ("mfs %0, rpid;" : "=r"(temp) : );
+ gdb_regs[GDB_RPID] = temp;
+ __asm__ __volatile__ ("mfs %0, rzpr;" : "=r"(temp) : );
+ gdb_regs[GDB_RZPR] = temp;
+ __asm__ __volatile__ ("mfs %0, rtlbx;" : "=r"(temp) : );
+ gdb_regs[GDB_RTLBX] = temp;
+ __asm__ __volatile__ ("mfs %0, rtlblo;" : "=r"(temp) : );
+ gdb_regs[GDB_RTLBLO] = temp;
+ __asm__ __volatile__ ("mfs %0, rtlbhi;" : "=r"(temp) : );
+ gdb_regs[GDB_RTLBHI] = temp;
+}
+
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ int i;
+ unsigned long *pt_regb = (unsigned long *)regs;
+
+ /* pt_regs and gdb_regs have the same 37 values.
+ * The rest of gdb_regs are unused and can't be changed.
+ * r0 register value can't be changed too. */
+ for (i = 1; i < (sizeof(struct pt_regs) / 4) - 1; i++)
+ pt_regb[i] = gdb_regs[i];
+}
+
+void microblaze_kgdb_break(struct pt_regs *regs)
+{
+ if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
+ return 0;
+
+ /* Jump over the first arch_kgdb_breakpoint which is barrier to
+ * get kgdb work. The same solution is used for powerpc */
+ if (*(u32 *) (regs->pc) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
+ regs->pc += BREAK_INSTR_SIZE;
+}
+
+/* untested */
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+ int i;
+ unsigned long *pt_regb = (unsigned long *)(p->thread.regs);
+
+ /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */
+ for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++)
+ gdb_regs[i] = pt_regb[i];
+
+ /* pvr part - we have 11 pvr regs */
+ for (i = 0; i < sizeof(struct pvr_s)/4; i++)
+ gdb_regs[GDB_PVR + i] = pvr.pvr[i];
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
+{
+ regs->pc = ip;
+}
+
+int kgdb_arch_handle_exception(int vector, int signo, int err_code,
+ char *remcom_in_buffer, char *remcom_out_buffer,
+ struct pt_regs *regs)
+{
+ char *ptr;
+ unsigned long address;
+ int cpu = smp_processor_id();
+
+ switch (remcom_in_buffer[0]) {
+ case 'c':
+ /* handle the optional parameter */
+ ptr = &remcom_in_buffer[1];
+ if (kgdb_hex2long(&ptr, &address))
+ regs->pc = address;
+
+ return 0;
+ }
+ return -1; /* this means that we do not want to exit from the handler */
+}
+
+int kgdb_arch_init(void)
+{
+ get_pvr(&pvr); /* Fill PVR structure */
+ return 0;
+}
+
+void kgdb_arch_exit(void)
+{
+ /* Nothing to do */
+}
+
+/*
+ * Global data
+ */
+struct kgdb_arch arch_kgdb_ops = {
+ .gdb_bpt_instr = {0xba, 0x0c, 0x00, 0x18}, /* brki r16, 0x18 */
+};
diff --git a/arch/microblaze/kernel/misc.S b/arch/microblaze/kernel/misc.S
index 0fb5fc6c1fc2..206da3da361f 100644
--- a/arch/microblaze/kernel/misc.S
+++ b/arch/microblaze/kernel/misc.S
@@ -76,7 +76,7 @@ early_console_reg_tlb_alloc:
* the UARTs nice and early. We use a 4k real==virtual mapping.
*/
ori r4, r0, MICROBLAZE_TLB_SIZE - 1
- mts rtlbx, r4 /* TLB slot 2 */
+ mts rtlbx, r4 /* TLB slot 63 */
or r4,r5,r0
andi r4,r4,0xfffff000
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 09bed44dfcd3..ba7c4b16ed35 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -76,8 +76,11 @@ __setup("hlt", hlt_setup);
void default_idle(void)
{
if (likely(hlt_counter)) {
- while (!need_resched())
- cpu_relax();
+ local_irq_disable();
+ stop_critical_timings();
+ cpu_relax();
+ start_critical_timings();
+ local_irq_enable();
} else {
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb__after_clear_bit();
diff --git a/arch/microblaze/kernel/ptrace.c b/arch/microblaze/kernel/ptrace.c
index a4a7770c6140..dc03ffc8174a 100644
--- a/arch/microblaze/kernel/ptrace.c
+++ b/arch/microblaze/kernel/ptrace.c
@@ -38,6 +38,8 @@
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/asm-offsets.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
/* Returns the address where the register at REG_OFFS in P is stashed away. */
static microblaze_reg_t *reg_save_addr(unsigned reg_offs,
@@ -101,8 +103,21 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
microblaze_reg_t *reg_addr = reg_save_addr(addr, child);
if (request == PTRACE_PEEKUSR)
val = *reg_addr;
- else
+ else {
+#if 1
*reg_addr = data;
+#else
+ /* MS potential problem on WB system
+ * Be aware that reg_addr is virtual address
+ * virt_to_phys conversion is necessary.
+ * This could be sensible solution.
+ */
+ u32 paddr = virt_to_phys((u32)reg_addr);
+ invalidate_icache_range(paddr, paddr + 4);
+ *reg_addr = data;
+ flush_dcache_range(paddr, paddr + 4);
+#endif
+ }
} else
rval = -EIO;
diff --git a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c
index 123692f22647..84bc6686102c 100644
--- a/arch/microblaze/kernel/stacktrace.c
+++ b/arch/microblaze/kernel/stacktrace.c
@@ -14,52 +14,18 @@
#include <linux/thread_info.h>
#include <linux/ptrace.h>
#include <linux/module.h>
+#include <asm/unwind.h>
-/* FIXME initial support */
void save_stack_trace(struct stack_trace *trace)
{
- unsigned long *sp;
- unsigned long addr;
- asm("addik %0, r1, 0" : "=r" (sp));
-
- while (!kstack_end(sp)) {
- addr = *sp++;
- if (__kernel_text_address(addr)) {
- if (trace->skip > 0)
- trace->skip--;
- else
- trace->entries[trace->nr_entries++] = addr;
-
- if (trace->nr_entries >= trace->max_entries)
- break;
- }
- }
+ /* Exclude our helper functions from the trace*/
+ trace->skip += 2;
+ microblaze_unwind(NULL, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
- unsigned int *sp;
- unsigned long addr;
-
- struct thread_info *ti = task_thread_info(tsk);
-
- if (tsk == current)
- asm("addik %0, r1, 0" : "=r" (sp));
- else
- sp = (unsigned int *)ti->cpu_context.r1;
-
- while (!kstack_end(sp)) {
- addr = *sp++;
- if (__kernel_text_address(addr)) {
- if (trace->skip > 0)
- trace->skip--;
- else
- trace->entries[trace->nr_entries++] = addr;
-
- if (trace->nr_entries >= trace->max_entries)
- break;
- }
- }
+ microblaze_unwind(tsk, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index ed61b2f17719..b1380ae93ae1 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -28,6 +28,7 @@
#include <asm/prom.h>
#include <asm/irq.h>
#include <asm/system.h>
+#include <linux/cnt32_to_63.h>
#ifdef CONFIG_SELFMOD_TIMER
#include <asm/selfmod.h>
@@ -135,7 +136,7 @@ static void microblaze_timer_set_mode(enum clock_event_mode mode,
static struct clock_event_device clockevent_microblaze_timer = {
.name = "microblaze_clockevent",
.features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
- .shift = 24,
+ .shift = 8,
.rating = 300,
.set_next_event = microblaze_timer_set_next_event,
.set_mode = microblaze_timer_set_mode,
@@ -195,7 +196,7 @@ static cycle_t microblaze_cc_read(const struct cyclecounter *cc)
static struct cyclecounter microblaze_cc = {
.read = microblaze_cc_read,
.mask = CLOCKSOURCE_MASK(32),
- .shift = 24,
+ .shift = 8,
};
int __init init_microblaze_timecounter(void)
@@ -213,7 +214,7 @@ static struct clocksource clocksource_microblaze = {
.rating = 300,
.read = microblaze_read,
.mask = CLOCKSOURCE_MASK(32),
- .shift = 24, /* I can shift it */
+ .shift = 8, /* I can shift it */
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@@ -235,6 +236,12 @@ static int __init microblaze_clocksource_init(void)
return 0;
}
+/*
+ * We have to protect accesses before timer initialization
+ * and return 0 for sched_clock function below.
+ */
+static int timer_initialized;
+
void __init time_init(void)
{
u32 irq, i = 0;
@@ -289,4 +296,15 @@ void __init time_init(void)
#endif
microblaze_clocksource_init();
microblaze_clockevent_init();
+ timer_initialized = 1;
+}
+
+unsigned long long notrace sched_clock(void)
+{
+ if (timer_initialized) {
+ struct clocksource *cs = &clocksource_microblaze;
+ cycle_t cyc = cnt32_to_63(cs->read(NULL));
+ return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
+ }
+ return 0;
}
diff --git a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
index 75e49202a5ed..ba034d421ec2 100644
--- a/arch/microblaze/kernel/traps.c
+++ b/arch/microblaze/kernel/traps.c
@@ -16,13 +16,14 @@
#include <asm/exceptions.h>
#include <asm/system.h>
+#include <asm/unwind.h>
void trap_init(void)
{
__enable_hw_exceptions();
}
-static unsigned long kstack_depth_to_print = 24;
+static unsigned long kstack_depth_to_print; /* 0 == entire stack */
static int __init kstack_setup(char *s)
{
@@ -30,31 +31,47 @@ static int __init kstack_setup(char *s)
}
__setup("kstack=", kstack_setup);
-void show_trace(struct task_struct *task, unsigned long *stack)
+void show_stack(struct task_struct *task, unsigned long *sp)
{
- unsigned long addr;
-
- if (!stack)
- stack = (unsigned long *)&stack;
+ unsigned long words_to_show;
+ u32 fp = (u32) sp;
+
+ if (fp == 0) {
+ if (task) {
+ fp = ((struct thread_info *)
+ (task->stack))->cpu_context.r1;
+ } else {
+ /* Pick up caller of dump_stack() */
+ fp = (u32)&sp - 8;
+ }
+ }
- printk(KERN_NOTICE "Call Trace: ");
-#ifdef CONFIG_KALLSYMS
- printk(KERN_NOTICE "\n");
-#endif
- while (!kstack_end(stack)) {
- addr = *stack++;
- /*
- * If the address is either in the text segment of the
- * kernel, or in the region which contains vmalloc'ed
- * memory, it *may* be the address of a calling
- * routine; if so, print it so that someone tracing
- * down the cause of the crash will be able to figure
- * out the call path that was taken.
- */
- if (kernel_text_address(addr))
- print_ip_sym(addr);
+ words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
+ if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
+ words_to_show = kstack_depth_to_print;
+
+ pr_info("Kernel Stack:\n");
+
+ /*
+ * Make the first line an 'odd' size if necessary to get
+ * remaining lines to start at an address multiple of 0x10
+ */
+ if (fp & 0xF) {
+ unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
+ if (line1_words < words_to_show) {
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
+ 4, (void *)fp, line1_words << 2, 0);
+ fp += line1_words << 2;
+ words_to_show -= line1_words;
+ }
}
- printk(KERN_NOTICE "\n");
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
+ words_to_show << 2, 0);
+ printk(KERN_INFO "\n\n");
+
+ pr_info("Call Trace:\n");
+ microblaze_unwind(task, NULL);
+ pr_info("\n");
if (!task)
task = current;
@@ -62,34 +79,6 @@ void show_trace(struct task_struct *task, unsigned long *stack)
debug_show_held_locks(task);
}
-void show_stack(struct task_struct *task, unsigned long *sp)
-{
- unsigned long *stack;
- int i;
-
- if (sp == NULL) {
- if (task)
- sp = (unsigned long *) ((struct thread_info *)
- (task->stack))->cpu_context.r1;
- else
- sp = (unsigned long *)&sp;
- }
-
- stack = sp;
-
- printk(KERN_INFO "\nStack:\n ");
-
- for (i = 0; i < kstack_depth_to_print; i++) {
- if (kstack_end(sp))
- break;
- if (i && ((i % 8) == 0))
- printk("\n ");
- printk("%08lx ", *sp++);
- }
- printk("\n");
- show_trace(task, stack);
-}
-
void dump_stack(void)
{
show_stack(NULL, NULL);
diff --git a/arch/microblaze/kernel/unwind.c b/arch/microblaze/kernel/unwind.c
new file mode 100644
index 000000000000..fefac5c33586
--- /dev/null
+++ b/arch/microblaze/kernel/unwind.c
@@ -0,0 +1,318 @@
+/*
+ * Backtrace support for Microblaze
+ *
+ * Copyright (C) 2010 Digital Design Corporation
+ *
+ * Based on arch/sh/kernel/cpu/sh5/unwind.c code which is:
+ * Copyright (C) 2004 Paul Mundt
+ * Copyright (C) 2004 Richard Curnow
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+/* #define DEBUG 1 */
+#include <linux/kallsyms.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <asm/sections.h>
+#include <asm/exceptions.h>
+#include <asm/unwind.h>
+
+struct stack_trace;
+
+/*
+ * On Microblaze, finding the previous stack frame is a little tricky.
+ * At this writing (3/2010), Microblaze does not support CONFIG_FRAME_POINTERS,
+ * and even if it did, gcc (4.1.2) does not store the frame pointer at
+ * a consistent offset within each frame. To determine frame size, it is
+ * necessary to search for the assembly instruction that creates or reclaims
+ * the frame and extract the size from it.
+ *
+ * Microblaze stores the stack pointer in r1, and creates a frame via
+ *
+ * addik r1, r1, -FRAME_SIZE
+ *
+ * The frame is reclaimed via
+ *
+ * addik r1, r1, FRAME_SIZE
+ *
+ * Frame creation occurs at or near the top of a function.
+ * Depending on the compiler, reclaim may occur at the end, or before
+ * a mid-function return.
+ *
+ * A stack frame is usually not created in a leaf function.
+ *
+ */
+
+/**
+ * get_frame_size - Extract the stack adjustment from an
+ * "addik r1, r1, adjust" instruction
+ * @instr : Microblaze instruction
+ *
+ * Return - Number of stack bytes the instruction reserves or reclaims
+ */
+inline long get_frame_size(unsigned long instr)
+{
+ return abs((s16)(instr & 0xFFFF));
+}
+
+/**
+ * find_frame_creation - Search backward to find the instruction that creates
+ * the stack frame (hopefully, for the same function the
+ * initial PC is in).
+ * @pc : Program counter at which to begin the search
+ *
+ * Return - PC at which stack frame creation occurs
+ * NULL if this cannot be found, i.e. a leaf function
+ */
+static unsigned long *find_frame_creation(unsigned long *pc)
+{
+ int i;
+
+ /* NOTE: Distance to search is arbitrary
+ * 250 works well for most things,
+ * 750 picks up things like tcp_recvmsg(),
+ * 1000 needed for fat_fill_super()
+ */
+ for (i = 0; i < 1000; i++, pc--) {
+ unsigned long instr;
+ s16 frame_size;
+
+ if (!kernel_text_address((unsigned long) pc))
+ return NULL;
+
+ instr = *pc;
+
+ /* addik r1, r1, foo ? */
+ if ((instr & 0xFFFF0000) != 0x30210000)
+ continue; /* No */
+
+ frame_size = get_frame_size(instr);
+ if ((frame_size < 8) || (frame_size & 3)) {
+ pr_debug(" Invalid frame size %d at 0x%p\n",
+ frame_size, pc);
+ return NULL;
+ }
+
+ pr_debug(" Found frame creation at 0x%p, size %d\n", pc,
+ frame_size);
+ return pc;
+ }
+
+ return NULL;
+}
+
+/**
+ * lookup_prev_stack_frame - Find the stack frame of the previous function.
+ * @fp : Frame (stack) pointer for current function
+ * @pc : Program counter within current function
+ * @leaf_return : r15 value within current function. If the current function
+ * is a leaf, this is the caller's return address.
+ * @pprev_fp : On exit, set to frame (stack) pointer for previous function
+ * @pprev_pc : On exit, set to current function caller's return address
+ *
+ * Return - 0 on success, -EINVAL if the previous frame cannot be found
+ */
+static int lookup_prev_stack_frame(unsigned long fp, unsigned long pc,
+ unsigned long leaf_return,
+ unsigned long *pprev_fp,
+ unsigned long *pprev_pc)
+{
+ unsigned long *prologue = NULL;
+
+ /* _switch_to is a special leaf function */
+ if (pc != (unsigned long) &_switch_to)
+ prologue = find_frame_creation((unsigned long *)pc);
+
+ if (prologue) {
+ long frame_size = get_frame_size(*prologue);
+
+ *pprev_fp = fp + frame_size;
+ *pprev_pc = *(unsigned long *)fp;
+ } else {
+ if (!leaf_return)
+ return -EINVAL;
+ *pprev_pc = leaf_return;
+ *pprev_fp = fp;
+ }
+
+ /* NOTE: don't check kernel_text_address here, to allow display
+ * of userland return address
+ */
+ return (!*pprev_pc || (*pprev_pc & 3)) ? -EINVAL : 0;
+}
+
+static void microblaze_unwind_inner(struct task_struct *task,
+ unsigned long pc, unsigned long fp,
+ unsigned long leaf_return,
+ struct stack_trace *trace);
+
+/**
+ * unwind_trap - Unwind through a system trap, that stored previous state
+ * on the stack.
+ */
+#ifdef CONFIG_MMU
+static inline void unwind_trap(struct task_struct *task, unsigned long pc,
+ unsigned long fp, struct stack_trace *trace)
+{
+ /* To be implemented */
+}
+#else
+static inline void unwind_trap(struct task_struct *task, unsigned long pc,
+ unsigned long fp, struct stack_trace *trace)
+{
+ const struct pt_regs *regs = (const struct pt_regs *) fp;
+ microblaze_unwind_inner(task, regs->pc, regs->r1, regs->r15, trace);
+}
+#endif
+
+/**
+ * microblaze_unwind_inner - Unwind the stack from the specified point
+ * @task : Task whose stack we are to unwind (may be NULL)
+ * @pc : Program counter from which we start unwinding
+ * @fp : Frame (stack) pointer from which we start unwinding
+ * @leaf_return : Value of r15 at pc. If the function is a leaf, this is
+ * the caller's return address.
+ * @trace : Where to store stack backtrace (PC values).
+ * NULL == print backtrace to kernel log
+ */
+void microblaze_unwind_inner(struct task_struct *task,
+ unsigned long pc, unsigned long fp,
+ unsigned long leaf_return,
+ struct stack_trace *trace)
+{
+ int ofs = 0;
+
+ pr_debug(" Unwinding with PC=%p, FP=%p\n", (void *)pc, (void *)fp);
+ if (!pc || !fp || (pc & 3) || (fp & 3)) {
+ pr_debug(" Invalid state for unwind, aborting\n");
+ return;
+ }
+ for (; pc != 0;) {
+ unsigned long next_fp, next_pc = 0;
+ unsigned long return_to = pc + 2 * sizeof(unsigned long);
+ const struct trap_handler_info *handler =
+ &microblaze_trap_handlers;
+
+ /* Is previous function the HW exception handler? */
+ if ((return_to >= (unsigned long)&_hw_exception_handler)
+ &&(return_to < (unsigned long)&ex_handler_unhandled)) {
+ /*
+ * HW exception handler doesn't save all registers,
+ * so we open-code a special case of unwind_trap()
+ */
+#ifndef CONFIG_MMU
+ const struct pt_regs *regs =
+ (const struct pt_regs *) fp;
+#endif
+ pr_info("HW EXCEPTION\n");
+#ifndef CONFIG_MMU
+ microblaze_unwind_inner(task, regs->r17 - 4,
+ fp + EX_HANDLER_STACK_SIZ,
+ regs->r15, trace);
+#endif
+ return;
+ }
+
+ /* Is previous function a trap handler? */
+ for (; handler->start_addr; ++handler) {
+ if ((return_to >= handler->start_addr)
+ && (return_to <= handler->end_addr)) {
+ if (!trace)
+ pr_info("%s\n", handler->trap_name);
+ unwind_trap(task, pc, fp, trace);
+ return;
+ }
+ }
+ pc -= ofs;
+
+ if (trace) {
+#ifdef CONFIG_STACKTRACE
+ if (trace->skip > 0)
+ trace->skip--;
+ else
+ trace->entries[trace->nr_entries++] = pc;
+
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+#endif
+ } else {
+ /* Have we reached userland? */
+ if (unlikely(pc == task_pt_regs(task)->pc)) {
+ pr_info("[<%p>] PID %lu [%s]\n",
+ (void *) pc,
+ (unsigned long) task->pid,
+ task->comm);
+ break;
+ } else
+ print_ip_sym(pc);
+ }
+
+ /* Stop when we reach anything not part of the kernel */
+ if (!kernel_text_address(pc))
+ break;
+
+ if (lookup_prev_stack_frame(fp, pc, leaf_return, &next_fp,
+ &next_pc) == 0) {
+ ofs = sizeof(unsigned long);
+ pc = next_pc & ~3;
+ fp = next_fp;
+ leaf_return = 0;
+ } else {
+ pr_debug(" Failed to find previous stack frame\n");
+ break;
+ }
+
+ pr_debug(" Next PC=%p, next FP=%p\n",
+ (void *)next_pc, (void *)next_fp);
+ }
+}
+
+/**
+ * microblaze_unwind - Stack unwinder for Microblaze (external entry point)
+ * @task : Task whose stack we are to unwind (NULL == current)
+ * @trace : Where to store stack backtrace (PC values).
+ * NULL == print backtrace to kernel log
+ */
+void microblaze_unwind(struct task_struct *task, struct stack_trace *trace)
+{
+ if (task) {
+ if (task == current) {
+ const struct pt_regs *regs = task_pt_regs(task);
+ microblaze_unwind_inner(task, regs->pc, regs->r1,
+ regs->r15, trace);
+ } else {
+ struct thread_info *thread_info =
+ (struct thread_info *)(task->stack);
+ const struct cpu_context *cpu_context =
+ &thread_info->cpu_context;
+
+ microblaze_unwind_inner(task,
+ (unsigned long) &_switch_to,
+ cpu_context->r1,
+ cpu_context->r15, trace);
+ }
+ } else {
+ unsigned long pc, fp;
+
+ __asm__ __volatile__ ("or %0, r1, r0" : "=r" (fp));
+
+ __asm__ __volatile__ (
+ "brlid %0, 0f;"
+ "nop;"
+ "0:"
+ : "=r" (pc)
+ );
+
+ /* Since we are not a leaf function, use leaf_return = 0 */
+ microblaze_unwind_inner(current, pc, fp, 0, trace);
+ }
+}
+
diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S
index db72d7124602..a09f2962fbec 100644
--- a/arch/microblaze/kernel/vmlinux.lds.S
+++ b/arch/microblaze/kernel/vmlinux.lds.S
@@ -10,7 +10,7 @@
OUTPUT_FORMAT("elf32-microblaze", "elf32-microblaze", "elf32-microblaze")
OUTPUT_ARCH(microblaze)
-ENTRY(_start)
+ENTRY(microblaze_start)
#include <asm/page.h>
#include <asm-generic/vmlinux.lds.h>
@@ -20,7 +20,7 @@ jiffies = jiffies_64 + 4;
SECTIONS {
. = CONFIG_KERNEL_START;
- _start = CONFIG_KERNEL_BASE_ADDR;
+ microblaze_start = CONFIG_KERNEL_BASE_ADDR;
.text : AT(ADDR(.text) - LOAD_OFFSET) {
_text = . ;
_stext = . ;
@@ -55,7 +55,7 @@ SECTIONS {
*/
.sdata2 : AT(ADDR(.sdata2) - LOAD_OFFSET) {
_ssrw = .;
- . = ALIGN(4096); /* page aligned when MMU used - origin 0x8 */
+ . = ALIGN(PAGE_SIZE); /* page aligned when MMU used */
*(.sdata2)
. = ALIGN(8);
_essrw = .;
@@ -70,7 +70,7 @@ SECTIONS {
/* Reserve some low RAM for r0 based memory references */
. = ALIGN(0x4) ;
r0_ram = . ;
- . = . + 4096; /* a page should be enough */
+ . = . + PAGE_SIZE; /* a page should be enough */
/* Under the microblaze ABI, .sdata and .sbss must be contiguous */
. = ALIGN(8);
@@ -120,7 +120,7 @@ SECTIONS {
__init_end_before_initramfs = .;
- .init.ramfs ALIGN(4096) : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
+ .init.ramfs ALIGN(PAGE_SIZE) : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
__initramfs_start = .;
*(.init.ramfs)
__initramfs_end = .;
@@ -132,11 +132,11 @@ SECTIONS {
* so that __init_end == __bss_start. This will make image.elf
* consistent with the image.bin
*/
- /* . = ALIGN(4096); */
+ /* . = ALIGN(PAGE_SIZE); */
}
__init_end = .;
- .bss ALIGN (4096) : AT(ADDR(.bss) - LOAD_OFFSET) {
+ .bss ALIGN (PAGE_SIZE) : AT(ADDR(.bss) - LOAD_OFFSET) {
/* page aligned when MMU used */
__bss_start = . ;
*(.bss*)
@@ -145,7 +145,7 @@ SECTIONS {
__bss_stop = . ;
_ebss = . ;
}
- . = ALIGN(4096);
+ . = ALIGN(PAGE_SIZE);
_end = .;
DISCARDS
diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
index bab922993185..57bd2a09610c 100644
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -37,10 +37,6 @@
#include <linux/uaccess.h>
#include <asm/exceptions.h>
-#if defined(CONFIG_KGDB)
-int debugger_kernel_faults = 1;
-#endif
-
static unsigned long pte_misses; /* updated by do_page_fault() */
static unsigned long pte_errors; /* updated by do_page_fault() */
@@ -81,10 +77,6 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
}
/* kernel has accessed a bad area */
-#if defined(CONFIG_KGDB)
- if (debugger_kernel_faults)
- debugger(regs);
-#endif
die("kernel access of bad area", regs, sig);
}
@@ -115,13 +107,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
if ((error_code & 0x13) == 0x13 || (error_code & 0x11) == 0x11)
is_write = 0;
-#if defined(CONFIG_KGDB)
- if (debugger_fault_handler && regs->trap == 0x300) {
- debugger_fault_handler(regs);
- return;
- }
-#endif /* CONFIG_KGDB */
-
if (unlikely(in_atomic() || !mm)) {
if (kernel_mode(regs))
goto bad_area_nosemaphore;
@@ -226,7 +211,6 @@ good_area:
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
-survive:
fault = handle_mm_fault(mm, vma, address, is_write ? FAULT_FLAG_WRITE : 0);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index db5934989926..65eb00419d19 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -134,13 +134,8 @@ void __init setup_memory(void)
* for 4GB of memory, using 4kB pages), plus 1 page
* (in case the address isn't page-aligned).
*/
-#ifndef CONFIG_MMU
- map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)),
- min_low_pfn, max_low_pfn);
-#else
- map_size = init_bootmem_node(&contig_page_data,
+ map_size = init_bootmem_node(NODE_DATA(0),
PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
-#endif
memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
/* free bootmem is whole main memory */