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Diffstat (limited to 'arch/sh/kernel/kgdb.c')
-rw-r--r--arch/sh/kernel/kgdb.c165
1 files changed, 137 insertions, 28 deletions
diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c
index 3e532d0d4a5..adad46e41a1 100644
--- a/arch/sh/kernel/kgdb.c
+++ b/arch/sh/kernel/kgdb.c
@@ -1,7 +1,7 @@
/*
* SuperH KGDB support
*
- * Copyright (C) 2008 Paul Mundt
+ * Copyright (C) 2008 - 2012 Paul Mundt
*
* Single stepping taken from the old stub by Henry Bell and Jeremy Siegel.
*
@@ -13,7 +13,9 @@
#include <linux/kdebug.h>
#include <linux/irq.h>
#include <linux/io.h>
+#include <linux/sched.h>
#include <asm/cacheflush.h>
+#include <asm/traps.h>
/* Macros for single step instruction identification */
#define OPCODE_BT(op) (((op) & 0xff00) == 0x8900)
@@ -163,42 +165,89 @@ static void undo_single_step(struct pt_regs *linux_regs)
stepped_opcode = 0;
}
-void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
-{
- int i;
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
+ { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[0]) },
+ { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[1]) },
+ { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[2]) },
+ { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[3]) },
+ { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[4]) },
+ { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[5]) },
+ { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[6]) },
+ { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[7]) },
+ { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[8]) },
+ { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[9]) },
+ { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[10]) },
+ { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[11]) },
+ { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[12]) },
+ { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[13]) },
+ { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[14]) },
+ { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[15]) },
+ { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, pc) },
+ { "pr", GDB_SIZEOF_REG, offsetof(struct pt_regs, pr) },
+ { "sr", GDB_SIZEOF_REG, offsetof(struct pt_regs, sr) },
+ { "gbr", GDB_SIZEOF_REG, offsetof(struct pt_regs, gbr) },
+ { "mach", GDB_SIZEOF_REG, offsetof(struct pt_regs, mach) },
+ { "macl", GDB_SIZEOF_REG, offsetof(struct pt_regs, macl) },
+ { "vbr", GDB_SIZEOF_REG, -1 },
+};
- for (i = 0; i < 16; i++)
- gdb_regs[GDB_R0 + i] = regs->regs[i];
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
+{
+ if (regno < 0 || regno >= DBG_MAX_REG_NUM)
+ return -EINVAL;
- gdb_regs[GDB_PC] = regs->pc;
- gdb_regs[GDB_PR] = regs->pr;
- gdb_regs[GDB_SR] = regs->sr;
- gdb_regs[GDB_GBR] = regs->gbr;
- gdb_regs[GDB_MACH] = regs->mach;
- gdb_regs[GDB_MACL] = regs->macl;
+ if (dbg_reg_def[regno].offset != -1)
+ memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+ dbg_reg_def[regno].size);
- __asm__ __volatile__ ("stc vbr, %0" : "=r" (gdb_regs[GDB_VBR]));
+ return 0;
}
-void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
{
- int i;
+ if (regno >= DBG_MAX_REG_NUM || regno < 0)
+ return NULL;
- for (i = 0; i < 16; i++)
- regs->regs[GDB_R0 + i] = gdb_regs[GDB_R0 + i];
+ if (dbg_reg_def[regno].size != -1)
+ memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+ dbg_reg_def[regno].size);
- regs->pc = gdb_regs[GDB_PC];
- regs->pr = gdb_regs[GDB_PR];
- regs->sr = gdb_regs[GDB_SR];
- regs->gbr = gdb_regs[GDB_GBR];
- regs->mach = gdb_regs[GDB_MACH];
- regs->macl = gdb_regs[GDB_MACL];
+ switch (regno) {
+ case GDB_VBR:
+ __asm__ __volatile__ ("stc vbr, %0" : "=r" (mem));
+ break;
+ }
+
+ return dbg_reg_def[regno].name;
}
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
+ struct pt_regs *thread_regs = task_pt_regs(p);
+ int reg;
+
+ /* Initialize to zero */
+ for (reg = 0; reg < DBG_MAX_REG_NUM; reg++)
+ gdb_regs[reg] = 0;
+
+ /*
+ * Copy out GP regs 8 to 14.
+ *
+ * switch_to() relies on SR.RB toggling, so regs 0->7 are banked
+ * and need privileged instructions to get to. The r15 value we
+ * fetch from the thread info directly.
+ */
+ for (reg = GDB_R8; reg < GDB_R15; reg++)
+ gdb_regs[reg] = thread_regs->regs[reg];
+
gdb_regs[GDB_R15] = p->thread.sp;
gdb_regs[GDB_PC] = p->thread.pc;
+
+ /*
+ * Additional registers we have context for
+ */
+ gdb_regs[GDB_PR] = thread_regs->pr;
+ gdb_regs[GDB_GBR] = thread_regs->gbr;
}
int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
@@ -237,6 +286,18 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
return -1;
}
+unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
+{
+ if (exception == 60)
+ return instruction_pointer(regs) - 2;
+ return instruction_pointer(regs);
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
+{
+ regs->pc = ip;
+}
+
/*
* The primary entry points for the kgdb debug trap table entries.
*/
@@ -247,28 +308,76 @@ BUILD_TRAP_HANDLER(singlestep)
local_irq_save(flags);
regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
- kgdb_handle_exception(vec >> 2, SIGTRAP, 0, regs);
+ kgdb_handle_exception(0, SIGTRAP, 0, regs);
local_irq_restore(flags);
}
+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();
+}
-BUILD_TRAP_HANDLER(breakpoint)
+static int __kgdb_notify(struct die_args *args, unsigned long cmd)
+{
+ int ret;
+
+ switch (cmd) {
+ case DIE_BREAKPOINT:
+ /*
+ * This means a user thread is single stepping
+ * a system call which should be ignored
+ */
+ if (test_thread_flag(TIF_SINGLESTEP))
+ return NOTIFY_DONE;
+
+ ret = kgdb_handle_exception(args->trapnr & 0xff, args->signr,
+ args->err, args->regs);
+ if (ret)
+ return NOTIFY_DONE;
+
+ break;
+ }
+
+ return NOTIFY_STOP;
+}
+
+static int
+kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
{
unsigned long flags;
- TRAP_HANDLER_DECL;
+ int ret;
local_irq_save(flags);
- kgdb_handle_exception(vec >> 2, SIGTRAP, 0, regs);
+ ret = __kgdb_notify(ptr, cmd);
local_irq_restore(flags);
+
+ return ret;
}
+static struct notifier_block kgdb_notifier = {
+ .notifier_call = kgdb_notify,
+
+ /*
+ * Lowest-prio notifier priority, we want to be notified last:
+ */
+ .priority = -INT_MAX,
+};
+
int kgdb_arch_init(void)
{
- return 0;
+ return register_die_notifier(&kgdb_notifier);
}
void kgdb_arch_exit(void)
{
+ unregister_die_notifier(&kgdb_notifier);
}
struct kgdb_arch arch_kgdb_ops = {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 07:02:20 +0000