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Diffstat (limited to 'arch/xtensa/include/asm/processor.h')
-rw-r--r--arch/xtensa/include/asm/processor.h125
1 files changed, 71 insertions, 54 deletions
diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h
index f7dd895b2353..60a211356335 100644
--- a/arch/xtensa/include/asm/processor.h
+++ b/arch/xtensa/include/asm/processor.h
@@ -10,25 +10,17 @@
#ifndef _XTENSA_PROCESSOR_H
#define _XTENSA_PROCESSOR_H
-#include <variant/core.h>
+#include <asm/core.h>
#include <linux/compiler.h>
#include <linux/stringify.h>
+
+#include <asm/bootparam.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/regs.h>
-/* Assertions. */
-
-#if (XCHAL_HAVE_WINDOWED != 1)
-# error Linux requires the Xtensa Windowed Registers Option.
-#endif
-
-/* Xtensa ABI requires stack alignment to be at least 16 */
-
-#define STACK_ALIGN (XCHAL_DATA_WIDTH > 16 ? XCHAL_DATA_WIDTH : 16)
-
-#define ARCH_SLAB_MINALIGN STACK_ALIGN
+#define ARCH_SLAB_MINALIGN XTENSA_STACK_ALIGNMENT
/*
* User space process size: 1 GB.
@@ -105,7 +97,17 @@
#define WSBITS (XCHAL_NUM_AREGS / 4) /* width of WINDOWSTART in bits */
#define WBBITS (XCHAL_NUM_AREGS_LOG2 - 2) /* width of WINDOWBASE in bits */
-#ifndef __ASSEMBLY__
+#if defined(__XTENSA_WINDOWED_ABI__)
+#define KERNEL_PS_WOE_MASK PS_WOE_MASK
+#elif defined(__XTENSA_CALL0_ABI__)
+#define KERNEL_PS_WOE_MASK 0
+#else
+#error Unsupported xtensa ABI
+#endif
+
+#ifndef __ASSEMBLER__
+
+#if defined(__XTENSA_WINDOWED_ABI__)
/* Build a valid return address for the specified call winsize.
* winsize must be 1 (call4), 2 (call8), or 3 (call12)
@@ -113,9 +115,25 @@
#define MAKE_RA_FOR_CALL(ra,ws) (((ra) & 0x3fffffff) | (ws) << 30)
/* Convert return address to a valid pc
- * Note: We assume that the stack pointer is in the same 1GB ranges as the ra
+ * Note: 'text' is the address within the same 1GB range as the ra
+ */
+#define MAKE_PC_FROM_RA(ra, text) (((ra) & 0x3fffffff) | ((unsigned long)(text) & 0xc0000000))
+
+#elif defined(__XTENSA_CALL0_ABI__)
+
+/* Build a valid return address for the specified call winsize.
+ * winsize must be 1 (call4), 2 (call8), or 3 (call12)
*/
-#define MAKE_PC_FROM_RA(ra,sp) (((ra) & 0x3fffffff) | ((sp) & 0xc0000000))
+#define MAKE_RA_FOR_CALL(ra, ws) (ra)
+
+/* Convert return address to a valid pc
+ * Note: 'text' is not used as 'ra' is always the full address
+ */
+#define MAKE_PC_FROM_RA(ra, text) (ra)
+
+#else
+#error Unsupported Xtensa ABI
+#endif
/* Spill slot location for the register reg in the spill area under the stack
* pointer sp. reg must be in the range [0..4).
@@ -132,30 +150,17 @@
*/
#define SPILL_SLOT_CALL12(sp, reg) (*(((unsigned long *)(sp)) - 16 + (reg)))
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
struct thread_struct {
/* kernel's return address and stack pointer for context switching */
unsigned long ra; /* kernel's a0: return address and window call size */
unsigned long sp; /* kernel's a1: stack pointer */
- mm_segment_t current_ds; /* see uaccess.h for example uses */
-
- /* struct xtensa_cpuinfo info; */
-
- unsigned long bad_vaddr; /* last user fault */
- unsigned long bad_uaddr; /* last kernel fault accessing user space */
- unsigned long error_code;
#ifdef CONFIG_HAVE_HW_BREAKPOINT
struct perf_event *ptrace_bp[XCHAL_NUM_IBREAK];
struct perf_event *ptrace_wp[XCHAL_NUM_DBREAK];
#endif
- /* Make structure 16 bytes aligned. */
- int align[0] __attribute__ ((aligned(16)));
-};
+} __aligned(16);
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
@@ -166,45 +171,54 @@ struct thread_struct {
{ \
ra: 0, \
sp: sizeof(init_stack) + (long) &init_stack, \
- current_ds: {0}, \
- /*info: {0}, */ \
- bad_vaddr: 0, \
- bad_uaddr: 0, \
- error_code: 0, \
}
/*
* Do necessary setup to start up a newly executed thread.
- * Note: We set-up ps as if we did a call4 to the new pc.
+ * Note: When windowed ABI is used for userspace we set-up ps
+ * as if we did a call4 to the new pc.
* set_thread_state in signal.c depends on it.
*/
-#define USER_PS_VALUE ((1 << PS_WOE_BIT) | \
+#if IS_ENABLED(CONFIG_USER_ABI_CALL0)
+#define USER_PS_VALUE ((USER_RING << PS_RING_SHIFT) | \
+ (1 << PS_UM_BIT) | \
+ (1 << PS_EXCM_BIT))
+#else
+#define USER_PS_VALUE (PS_WOE_MASK | \
(1 << PS_CALLINC_SHIFT) | \
(USER_RING << PS_RING_SHIFT) | \
(1 << PS_UM_BIT) | \
(1 << PS_EXCM_BIT))
+#endif
/* Clearing a0 terminates the backtrace. */
#define start_thread(regs, new_pc, new_sp) \
- memset(regs, 0, sizeof(*regs)); \
- regs->pc = new_pc; \
- regs->ps = USER_PS_VALUE; \
- regs->areg[1] = new_sp; \
- regs->areg[0] = 0; \
- regs->wmask = 1; \
- regs->depc = 0; \
- regs->windowbase = 0; \
- regs->windowstart = 1;
+ do { \
+ unsigned long syscall = (regs)->syscall; \
+ unsigned long current_aregs[16]; \
+ memcpy(current_aregs, (regs)->areg, sizeof(current_aregs)); \
+ memset((regs), 0, sizeof(*(regs))); \
+ (regs)->pc = (new_pc); \
+ (regs)->ps = USER_PS_VALUE; \
+ memcpy((regs)->areg, current_aregs, sizeof(current_aregs)); \
+ (regs)->areg[1] = (new_sp); \
+ (regs)->areg[0] = 0; \
+ (regs)->wmask = 1; \
+ (regs)->depc = 0; \
+ (regs)->windowbase = 0; \
+ (regs)->windowstart = 1; \
+ (regs)->syscall = syscall; \
+ } while (0)
/* Forward declaration */
struct task_struct;
struct mm_struct;
-/* Free all resources held by a thread. */
-#define release_thread(thread) do { } while(0)
+extern unsigned long __get_wchan(struct task_struct *p);
-extern unsigned long get_wchan(struct task_struct *p);
+void init_arch(bp_tag_t *bp_start);
+void do_notify_resume(struct pt_regs *regs);
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->areg[1])
@@ -215,8 +229,8 @@ extern unsigned long get_wchan(struct task_struct *p);
#define xtensa_set_sr(x, sr) \
({ \
- unsigned int v = (unsigned int)(x); \
- __asm__ __volatile__ ("wsr %0, "__stringify(sr) :: "a"(v)); \
+ __asm__ __volatile__ ("wsr %0, "__stringify(sr) :: \
+ "a"((unsigned int)(x))); \
})
#define xtensa_get_sr(sr) \
@@ -226,9 +240,12 @@ extern unsigned long get_wchan(struct task_struct *p);
v; \
})
-#ifndef XCHAL_HAVE_EXTERN_REGS
-#define XCHAL_HAVE_EXTERN_REGS 0
-#endif
+#define xtensa_xsr(x, sr) \
+ ({ \
+ unsigned int __v__ = (unsigned int)(x); \
+ __asm__ __volatile__ ("xsr %0, " __stringify(sr) : "+a"(__v__)); \
+ __v__; \
+ })
#if XCHAL_HAVE_EXTERN_REGS
@@ -246,5 +263,5 @@ static inline unsigned long get_er(unsigned long addr)
#endif /* XCHAL_HAVE_EXTERN_REGS */
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
#endif /* _XTENSA_PROCESSOR_H */
generated by cgit (git 2.34.1) at 2025-12-24 22:22:27 +0000