From 63ab25ebbc50f74550bd8d164a34724b498f6fb9 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Thu, 26 May 2011 16:25:45 -0700 Subject: [PATCH] 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 Cc: Oleg Nesterov Cc: Jason Wessel Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Acked-by: Paul Mundt Acked-by: Dongdong Deng Cc: Sergei Shtylyov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/blackfin/include/asm/kgdb.h | 1 + arch/sh/include/asm/kgdb.h | 1 + arch/x86/include/asm/kgdb.h | 1 + drivers/misc/kgdbts.c | 29 +++++++++++------------------ 4 files changed, 14 insertions(+), 18 deletions(-) diff --git a/arch/blackfin/include/asm/kgdb.h b/arch/blackfin/include/asm/kgdb.h index 3ac0c72e9fe..aaf884591b0 100644 --- a/arch/blackfin/include/asm/kgdb.h +++ b/arch/blackfin/include/asm/kgdb.h @@ -108,6 +108,7 @@ static inline void arch_kgdb_breakpoint(void) #else # define CACHE_FLUSH_IS_SAFE 1 #endif +#define GDB_ADJUSTS_BREAK_OFFSET #define HW_INST_WATCHPOINT_NUM 6 #define HW_WATCHPOINT_NUM 8 #define TYPE_INST_WATCHPOINT 0 diff --git a/arch/sh/include/asm/kgdb.h b/arch/sh/include/asm/kgdb.h index 4235e228d92..f3613952d1a 100644 --- a/arch/sh/include/asm/kgdb.h +++ b/arch/sh/include/asm/kgdb.h @@ -34,5 +34,6 @@ static inline void arch_kgdb_breakpoint(void) #define CACHE_FLUSH_IS_SAFE 1 #define BREAK_INSTR_SIZE 2 +#define GDB_ADJUSTS_BREAK_OFFSET #endif /* __ASM_SH_KGDB_H */ diff --git a/arch/x86/include/asm/kgdb.h b/arch/x86/include/asm/kgdb.h index 396f5b5fc4d..77e95f54570 100644 --- a/arch/x86/include/asm/kgdb.h +++ b/arch/x86/include/asm/kgdb.h @@ -77,6 +77,7 @@ static inline void arch_kgdb_breakpoint(void) } #define BREAK_INSTR_SIZE 1 #define CACHE_FLUSH_IS_SAFE 1 +#define GDB_ADJUSTS_BREAK_OFFSET extern int kgdb_ll_trap(int cmd, const char *str, struct pt_regs *regs, long err, int trap, int sig); diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c index 74f16f167b8..b0c56313dbb 100644 --- a/drivers/misc/kgdbts.c +++ b/drivers/misc/kgdbts.c @@ -285,33 +285,26 @@ static void hw_break_val_write(void) static int check_and_rewind_pc(char *put_str, char *arg) { unsigned long addr = lookup_addr(arg); + unsigned long ip; int offset = 0; kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs, NUMREGBYTES); gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs); - v2printk("Stopped at IP: %lx\n", instruction_pointer(&kgdbts_regs)); -#ifdef CONFIG_X86 - /* On x86 a breakpoint stop requires it to be decremented */ - if (addr + 1 == kgdbts_regs.ip) - offset = -1; -#elif defined(CONFIG_SUPERH) - /* On SUPERH a breakpoint stop requires it to be decremented */ - if (addr + 2 == kgdbts_regs.pc) - offset = -2; + ip = instruction_pointer(&kgdbts_regs); + v2printk("Stopped at IP: %lx\n", ip); +#ifdef GDB_ADJUSTS_BREAK_OFFSET + /* On some arches, a breakpoint stop requires it to be decremented */ + if (addr + BREAK_INSTR_SIZE == ip) + offset = -BREAK_INSTR_SIZE; #endif - if (strcmp(arg, "silent") && - instruction_pointer(&kgdbts_regs) + offset != addr) { + if (strcmp(arg, "silent") && ip + offset != addr) { eprintk("kgdbts: BP mismatch %lx expected %lx\n", - instruction_pointer(&kgdbts_regs) + offset, addr); + ip + offset, addr); return 1; } -#ifdef CONFIG_X86 - /* On x86 adjust the instruction pointer if needed */ - kgdbts_regs.ip += offset; -#elif defined(CONFIG_SUPERH) - kgdbts_regs.pc += offset; -#endif + /* Readjust the instruction pointer if needed */ + instruction_pointer_set(&kgdbts_regs, ip + offset); return 0; } -- 2.20.1