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kgdbts: unify/generalize gdb breakpoint adjustment 

The Blackfin arch, like the x86 arch, needs to adjust the PC manually
after a breakpoint is hit as normally this is handled by the remote gdb.
However, rather than starting another arch ifdef mess, create a common
GDB_ADJUSTS_BREAK_OFFSET define for any arch to opt-in via their kgdb.h.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Dongdong Deng <dongdong.deng@windriver.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Frysinger 2011-05-26 16:25:45 -07:00 committed by Linus Torvalds
parent 3cea45c6ef
commit 63ab25ebbc
4 changed files with 14 additions and 18 deletions
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1
arch/blackfin/include/asm/kgdb.h
View File

@ -108,6 +108,7 @@ static inline void arch_kgdb_breakpoint(void)
#else #else
# define CACHE_FLUSH_IS_SAFE 1 # define CACHE_FLUSH_IS_SAFE 1
#endif #endif
#define GDB_ADJUSTS_BREAK_OFFSET
#define HW_INST_WATCHPOINT_NUM 6 #define HW_INST_WATCHPOINT_NUM 6
#define HW_WATCHPOINT_NUM 8 #define HW_WATCHPOINT_NUM 8
#define TYPE_INST_WATCHPOINT 0 #define TYPE_INST_WATCHPOINT 0

1
arch/sh/include/asm/kgdb.h
View File

@ -34,5 +34,6 @@ static inline void arch_kgdb_breakpoint(void)
#define CACHE_FLUSH_IS_SAFE 1 #define CACHE_FLUSH_IS_SAFE 1
#define BREAK_INSTR_SIZE 2 #define BREAK_INSTR_SIZE 2
#define GDB_ADJUSTS_BREAK_OFFSET
#endif /* __ASM_SH_KGDB_H */ #endif /* __ASM_SH_KGDB_H */

1
arch/x86/include/asm/kgdb.h
View File

@ -77,6 +77,7 @@ static inline void arch_kgdb_breakpoint(void)
} }
#define BREAK_INSTR_SIZE 1 #define BREAK_INSTR_SIZE 1
#define CACHE_FLUSH_IS_SAFE 1 #define CACHE_FLUSH_IS_SAFE 1
#define GDB_ADJUSTS_BREAK_OFFSET
extern int kgdb_ll_trap(int cmd, const char *str, extern int kgdb_ll_trap(int cmd, const char *str,
struct pt_regs *regs, long err, int trap, int sig); struct pt_regs *regs, long err, int trap, int sig);

29
drivers/misc/kgdbts.c
View File

@ -285,33 +285,26 @@ static void hw_break_val_write(void)
static int check_and_rewind_pc(char *put_str, char *arg) static int check_and_rewind_pc(char *put_str, char *arg)
{ {
unsigned long addr = lookup_addr(arg); unsigned long addr = lookup_addr(arg);
unsigned long ip;
int offset = 0; int offset = 0;
kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs, kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
NUMREGBYTES); NUMREGBYTES);
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs); gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
v2printk("Stopped at IP: %lx\n", instruction_pointer(&kgdbts_regs)); ip = instruction_pointer(&kgdbts_regs);
#ifdef CONFIG_X86 v2printk("Stopped at IP: %lx\n", ip);
/* On x86 a breakpoint stop requires it to be decremented */ #ifdef GDB_ADJUSTS_BREAK_OFFSET
if (addr + 1 == kgdbts_regs.ip) /* On some arches, a breakpoint stop requires it to be decremented */
offset = -1; if (addr + BREAK_INSTR_SIZE == ip)
#elif defined(CONFIG_SUPERH) offset = -BREAK_INSTR_SIZE;
/* On SUPERH a breakpoint stop requires it to be decremented */
if (addr + 2 == kgdbts_regs.pc)
offset = -2;
#endif #endif
if (strcmp(arg, "silent") && if (strcmp(arg, "silent") && ip + offset != addr) {
instruction_pointer(&kgdbts_regs) + offset != addr) {
eprintk("kgdbts: BP mismatch %lx expected %lx\n", eprintk("kgdbts: BP mismatch %lx expected %lx\n",
instruction_pointer(&kgdbts_regs) + offset, addr); ip + offset, addr);
return 1; return 1;
} }
#ifdef CONFIG_X86 /* Readjust the instruction pointer if needed */
/* On x86 adjust the instruction pointer if needed */ instruction_pointer_set(&kgdbts_regs, ip + offset);
kgdbts_regs.ip += offset;
#elif defined(CONFIG_SUPERH)
kgdbts_regs.pc += offset;
#endif
return 0; return 0;
} }