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Diffstat (limited to 'arch/powerpc/kernel/kgdb.c')
-rw-r--r--arch/powerpc/kernel/kgdb.c116
1 files changed, 56 insertions, 60 deletions
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index dbf098121ce6..5081334b7bd2 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* PowerPC backend to the KGDB stub.
*
@@ -8,10 +9,6 @@
* PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
* Sergei Shtylyov <sshtylyov@ru.mvista.com>
* Copyright (C) 2007-2008 Wind River Systems, Inc.
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program as licensed "as is" without any warranty of any
- * kind, whether express or implied.
*/
#include <linux/kernel.h>
@@ -24,7 +21,9 @@
#include <asm/processor.h>
#include <asm/machdep.h>
#include <asm/debug.h>
+#include <asm/text-patching.h>
#include <linux/slab.h>
+#include <asm/inst.h>
/*
* This table contains the mapping between PowerPC hardware trap types, and
@@ -46,9 +45,9 @@ static struct hard_trap_info
{ 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */
{ 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */
{ 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */
-#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
+#ifdef CONFIG_BOOKE
{ 0x2002, 0x05 /* SIGTRAP */ }, /* debug */
-#if defined(CONFIG_FSL_BOOKE)
+#if defined(CONFIG_PPC_85xx)
{ 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */
{ 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */
{ 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */
@@ -58,18 +57,18 @@ static struct hard_trap_info
{ 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */
{ 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */
{ 0x3200, 0x02 /* SIGINT */ }, /* watchdog */
-#else /* ! CONFIG_FSL_BOOKE */
+#else /* ! CONFIG_PPC_85xx */
{ 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */
{ 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */
{ 0x1020, 0x02 /* SIGINT */ }, /* watchdog */
{ 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */
{ 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */
#endif
-#else /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */
+#else /* !CONFIG_BOOKE */
{ 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */
-#if defined(CONFIG_8xx)
+#if defined(CONFIG_PPC_8xx)
{ 0x1000, 0x04 /* SIGILL */ }, /* software emulation */
-#else /* ! CONFIG_8xx */
+#else /* ! CONFIG_PPC_8xx */
{ 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */
{ 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */
{ 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */
@@ -116,14 +115,14 @@ int kgdb_skipexception(int exception, struct pt_regs *regs)
return kgdb_isremovedbreak(regs->nip);
}
-static int kgdb_call_nmi_hook(struct pt_regs *regs)
+static int kgdb_debugger_ipi(struct pt_regs *regs)
{
kgdb_nmicallback(raw_smp_processor_id(), regs);
return 0;
}
#ifdef CONFIG_SMP
-void kgdb_roundup_cpus(unsigned long flags)
+void kgdb_roundup_cpus(void)
{
smp_send_debugger_break();
}
@@ -144,47 +143,19 @@ static int kgdb_handle_breakpoint(struct pt_regs *regs)
if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
return 0;
- if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
- regs->nip += BREAK_INSTR_SIZE;
+ if (*(u32 *)regs->nip == BREAK_INSTR)
+ regs_add_return_ip(regs, BREAK_INSTR_SIZE);
return 1;
}
-static DEFINE_PER_CPU(struct thread_info, kgdb_thread_info);
static int kgdb_singlestep(struct pt_regs *regs)
{
- struct thread_info *thread_info, *exception_thread_info;
- struct thread_info *backup_current_thread_info =
- this_cpu_ptr(&kgdb_thread_info);
-
if (user_mode(regs))
return 0;
- /*
- * On Book E and perhaps other processors, singlestep is handled on
- * the critical exception stack. This causes current_thread_info()
- * to fail, since it it locates the thread_info by masking off
- * the low bits of the current stack pointer. We work around
- * this issue by copying the thread_info from the kernel stack
- * before calling kgdb_handle_exception, and copying it back
- * afterwards. On most processors the copy is avoided since
- * exception_thread_info == thread_info.
- */
- thread_info = (struct thread_info *)(regs->gpr[1] & ~(THREAD_SIZE-1));
- exception_thread_info = current_thread_info();
-
- if (thread_info != exception_thread_info) {
- /* Save the original current_thread_info. */
- memcpy(backup_current_thread_info, exception_thread_info, sizeof *thread_info);
- memcpy(exception_thread_info, thread_info, sizeof *thread_info);
- }
-
kgdb_handle_exception(0, SIGTRAP, 0, regs);
- if (thread_info != exception_thread_info)
- /* Restore current_thread_info lastly. */
- memcpy(exception_thread_info, backup_current_thread_info, sizeof *thread_info);
-
return 1;
}
@@ -220,7 +191,7 @@ static int kgdb_break_match(struct pt_regs *regs)
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
- STACK_FRAME_OVERHEAD);
+ STACK_INT_FRAME_REGS);
unsigned long *ptr = gdb_regs;
int reg;
@@ -237,7 +208,7 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
for (reg = 14; reg < 32; reg++)
PACK64(ptr, regs->gpr[reg]);
-#ifdef CONFIG_FSL_BOOKE
+#ifdef CONFIG_PPC_85xx
#ifdef CONFIG_SPE
for (reg = 0; reg < 32; reg++)
PACK64(ptr, p->thread.evr[reg]);
@@ -263,7 +234,7 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
#define GDB_SIZEOF_REG sizeof(unsigned long)
#define GDB_SIZEOF_REG_U32 sizeof(u32)
-#ifdef CONFIG_FSL_BOOKE
+#ifdef CONFIG_PPC_85xx
#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
#else
#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
@@ -358,7 +329,7 @@ char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
if (regno >= 32 && regno < 64) {
/* FP registers 32 -> 63 */
-#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
+#if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE)
if (current)
memcpy(mem, &current->thread.evr[regno-32],
dbg_reg_def[regno].size);
@@ -384,7 +355,7 @@ int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
if (regno >= 32 && regno < 64) {
/* FP registers 32 -> 63 */
-#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
+#if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE)
memcpy(&current->thread.evr[regno-32], mem,
dbg_reg_def[regno].size);
#else
@@ -398,11 +369,11 @@ int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
{
- regs->nip = pc;
+ regs_set_return_ip(regs, pc);
}
/*
- * This function does PowerPC specific procesing for interfacing to gdb.
+ * This function does PowerPC specific processing for interfacing to gdb.
*/
int kgdb_arch_handle_exception(int vector, int signo, int err_code,
char *remcom_in_buffer, char *remcom_out_buffer,
@@ -420,7 +391,7 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
case 'c':
/* handle the optional parameter */
if (kgdb_hex2long(&ptr, &addr))
- linux_regs->nip = addr;
+ regs_set_return_ip(linux_regs, addr);
atomic_set(&kgdb_cpu_doing_single_step, -1);
/* set the trace bit if we're stepping */
@@ -428,9 +399,9 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
mtspr(SPRN_DBCR0,
mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
- linux_regs->msr |= MSR_DE;
+ regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE);
#else
- linux_regs->msr |= MSR_SE;
+ regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE);
#endif
atomic_set(&kgdb_cpu_doing_single_step,
raw_smp_processor_id());
@@ -441,16 +412,41 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
return -1;
}
+int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
+{
+ u32 instr, *addr = (u32 *)bpt->bpt_addr;
+ int err;
+
+ err = get_kernel_nofault(instr, addr);
+ if (err)
+ return err;
+
+ err = patch_instruction(addr, ppc_inst(BREAK_INSTR));
+ if (err)
+ return -EFAULT;
+
+ *(u32 *)bpt->saved_instr = instr;
+
+ return 0;
+}
+
+int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
+{
+ int err;
+ unsigned int instr = *(unsigned int *)bpt->saved_instr;
+ u32 *addr = (u32 *)bpt->bpt_addr;
+
+ err = patch_instruction(addr, ppc_inst(instr));
+ if (err)
+ return -EFAULT;
+
+ return 0;
+}
+
/*
* Global data
*/
-struct kgdb_arch arch_kgdb_ops = {
-#ifdef __LITTLE_ENDIAN__
- .gdb_bpt_instr = {0x08, 0x10, 0x82, 0x7d},
-#else
- .gdb_bpt_instr = {0x7d, 0x82, 0x10, 0x08},
-#endif
-};
+const struct kgdb_arch arch_kgdb_ops;
static int kgdb_not_implemented(struct pt_regs *regs)
{
@@ -475,7 +471,7 @@ int kgdb_arch_init(void)
old__debugger_break_match = __debugger_break_match;
old__debugger_fault_handler = __debugger_fault_handler;
- __debugger_ipi = kgdb_call_nmi_hook;
+ __debugger_ipi = kgdb_debugger_ipi;
__debugger = kgdb_debugger;
__debugger_bpt = kgdb_handle_breakpoint;
__debugger_sstep = kgdb_singlestep;
generated by cgit (git 2.34.1) at 2025-12-25 12:29:18 +0000