diff options
Diffstat (limited to 'arch/arm/kernel/kgdb.c')
| -rw-r--r-- | arch/arm/kernel/kgdb.c | 142 |
1 files changed, 99 insertions, 43 deletions
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c index ba8ccfede964..778c2f7024ff 100644 --- a/arch/arm/kernel/kgdb.c +++ b/arch/arm/kernel/kgdb.c @@ -9,57 +9,63 @@ * Authors: George Davis <davis_g@mvista.com> * Deepak Saxena <dsaxena@plexity.net> */ +#include <linux/irq.h> +#include <linux/kdebug.h> #include <linux/kgdb.h> #include <asm/traps.h> -/* Make a local copy of the registers passed into the handler (bletch) */ -void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) +struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = { - int regno; - - /* Initialize all to zero. */ - for (regno = 0; regno < GDB_MAX_REGS; regno++) - gdb_regs[regno] = 0; + { "r0", 4, offsetof(struct pt_regs, ARM_r0)}, + { "r1", 4, offsetof(struct pt_regs, ARM_r1)}, + { "r2", 4, offsetof(struct pt_regs, ARM_r2)}, + { "r3", 4, offsetof(struct pt_regs, ARM_r3)}, + { "r4", 4, offsetof(struct pt_regs, ARM_r4)}, + { "r5", 4, offsetof(struct pt_regs, ARM_r5)}, + { "r6", 4, offsetof(struct pt_regs, ARM_r6)}, + { "r7", 4, offsetof(struct pt_regs, ARM_r7)}, + { "r8", 4, offsetof(struct pt_regs, ARM_r8)}, + { "r9", 4, offsetof(struct pt_regs, ARM_r9)}, + { "r10", 4, offsetof(struct pt_regs, ARM_r10)}, + { "fp", 4, offsetof(struct pt_regs, ARM_fp)}, + { "ip", 4, offsetof(struct pt_regs, ARM_ip)}, + { "sp", 4, offsetof(struct pt_regs, ARM_sp)}, + { "lr", 4, offsetof(struct pt_regs, ARM_lr)}, + { "pc", 4, offsetof(struct pt_regs, ARM_pc)}, + { "f0", 12, -1 }, + { "f1", 12, -1 }, + { "f2", 12, -1 }, + { "f3", 12, -1 }, + { "f4", 12, -1 }, + { "f5", 12, -1 }, + { "f6", 12, -1 }, + { "f7", 12, -1 }, + { "fps", 4, -1 }, + { "cpsr", 4, offsetof(struct pt_regs, ARM_cpsr)}, +}; - gdb_regs[_R0] = kernel_regs->ARM_r0; - gdb_regs[_R1] = kernel_regs->ARM_r1; - gdb_regs[_R2] = kernel_regs->ARM_r2; - gdb_regs[_R3] = kernel_regs->ARM_r3; - gdb_regs[_R4] = kernel_regs->ARM_r4; - gdb_regs[_R5] = kernel_regs->ARM_r5; - gdb_regs[_R6] = kernel_regs->ARM_r6; - gdb_regs[_R7] = kernel_regs->ARM_r7; - gdb_regs[_R8] = kernel_regs->ARM_r8; - gdb_regs[_R9] = kernel_regs->ARM_r9; - gdb_regs[_R10] = kernel_regs->ARM_r10; - gdb_regs[_FP] = kernel_regs->ARM_fp; - gdb_regs[_IP] = kernel_regs->ARM_ip; - gdb_regs[_SPT] = kernel_regs->ARM_sp; - gdb_regs[_LR] = kernel_regs->ARM_lr; - gdb_regs[_PC] = kernel_regs->ARM_pc; - gdb_regs[_CPSR] = kernel_regs->ARM_cpsr; +char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) +{ + if (regno >= DBG_MAX_REG_NUM || regno < 0) + return NULL; + + if (dbg_reg_def[regno].offset != -1) + memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, + dbg_reg_def[regno].size); + else + memset(mem, 0, dbg_reg_def[regno].size); + return dbg_reg_def[regno].name; } -/* Copy local gdb registers back to kgdb regs, for later copy to kernel */ -void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) +int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) { - kernel_regs->ARM_r0 = gdb_regs[_R0]; - kernel_regs->ARM_r1 = gdb_regs[_R1]; - kernel_regs->ARM_r2 = gdb_regs[_R2]; - kernel_regs->ARM_r3 = gdb_regs[_R3]; - kernel_regs->ARM_r4 = gdb_regs[_R4]; - kernel_regs->ARM_r5 = gdb_regs[_R5]; - kernel_regs->ARM_r6 = gdb_regs[_R6]; - kernel_regs->ARM_r7 = gdb_regs[_R7]; - kernel_regs->ARM_r8 = gdb_regs[_R8]; - kernel_regs->ARM_r9 = gdb_regs[_R9]; - kernel_regs->ARM_r10 = gdb_regs[_R10]; - kernel_regs->ARM_fp = gdb_regs[_FP]; - kernel_regs->ARM_ip = gdb_regs[_IP]; - kernel_regs->ARM_sp = gdb_regs[_SPT]; - kernel_regs->ARM_lr = gdb_regs[_LR]; - kernel_regs->ARM_pc = gdb_regs[_PC]; - kernel_regs->ARM_cpsr = gdb_regs[_CPSR]; + if (regno >= DBG_MAX_REG_NUM || regno < 0) + return -EINVAL; + + if (dbg_reg_def[regno].offset != -1) + memcpy((void *)regs + dbg_reg_def[regno].offset, mem, + dbg_reg_def[regno].size); + return 0; } void @@ -97,6 +103,11 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task) gdb_regs[_CPSR] = thread_regs->ARM_cpsr; } +void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) +{ + regs->ARM_pc = pc; +} + static int compiled_break; int kgdb_arch_handle_exception(int exception_vector, int signo, @@ -158,6 +169,45 @@ static struct undef_hook kgdb_compiled_brkpt_hook = { .fn = kgdb_compiled_brk_fn }; +static void kgdb_call_nmi_hook(void *ignored) +{ + kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); +} + +void kgdb_roundup_cpus(unsigned long flags) +{ + local_irq_enable(); + smp_call_function(kgdb_call_nmi_hook, NULL, 0); + local_irq_disable(); +} + +static int __kgdb_notify(struct die_args *args, unsigned long cmd) +{ + struct pt_regs *regs = args->regs; + + if (kgdb_handle_exception(1, args->signr, cmd, regs)) + return NOTIFY_DONE; + return NOTIFY_STOP; +} +static int +kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr) +{ + unsigned long flags; + int ret; + + local_irq_save(flags); + ret = __kgdb_notify(ptr, cmd); + local_irq_restore(flags); + + return ret; +} + +static struct notifier_block kgdb_notifier = { + .notifier_call = kgdb_notify, + .priority = -INT_MAX, +}; + + /** * kgdb_arch_init - Perform any architecture specific initalization. * @@ -166,6 +216,11 @@ static struct undef_hook kgdb_compiled_brkpt_hook = { */ int kgdb_arch_init(void) { + int ret = register_die_notifier(&kgdb_notifier); + + if (ret != 0) + return ret; + register_undef_hook(&kgdb_brkpt_hook); register_undef_hook(&kgdb_compiled_brkpt_hook); @@ -182,6 +237,7 @@ void kgdb_arch_exit(void) { unregister_undef_hook(&kgdb_brkpt_hook); unregister_undef_hook(&kgdb_compiled_brkpt_hook); + unregister_die_notifier(&kgdb_notifier); } /* |