diff options
| author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-01-11 22:46:03 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:05:00 -0800 |
| commit | 60923df35edab273d0bd8e829cdfdc5cfbb4fd2c (patch) | |
| tree | d4869124d1344f711671a33628e5eebb16ecd68c /arch | |
| parent | 100c0e36852a771864c56c31b260b7810b554170 (diff) | |
[PATCH] x86_64: allow setting RF in EFLAGS
Setting RF (resume flag) allows a debugger to resume execution after a code
breakpoint without tripping the breakpoint again. It is reset by the CPU
after executing one instruction.
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86_64/ia32/ptrace32.c | 9 | ||||
| -rw-r--r-- | arch/x86_64/kernel/ptrace.c | 9 |
2 files changed, 12 insertions, 6 deletions
diff --git a/arch/x86_64/ia32/ptrace32.c b/arch/x86_64/ia32/ptrace32.c index 5f4cdfa5690..ea4394e021d 100644 --- a/arch/x86_64/ia32/ptrace32.c +++ b/arch/x86_64/ia32/ptrace32.c @@ -28,9 +28,12 @@ #include <asm/i387.h> #include <asm/fpu32.h> -/* determines which flags the user has access to. */ -/* 1 = access 0 = no access */ -#define FLAG_MASK 0x44dd5UL +/* + * Determines which flags the user has access to [1 = access, 0 = no access]. + * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9). + * Also masks reserved bits (31-22, 15, 5, 3, 1). + */ +#define FLAG_MASK 0x54dd5UL #define R32(l,q) \ case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c index a87b6cebe80..86248bc9303 100644 --- a/arch/x86_64/kernel/ptrace.c +++ b/arch/x86_64/kernel/ptrace.c @@ -36,9 +36,12 @@ * in exit.c or in signal.c. */ -/* determines which flags the user has access to. */ -/* 1 = access 0 = no access */ -#define FLAG_MASK 0x44dd5UL +/* + * Determines which flags the user has access to [1 = access, 0 = no access]. + * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9). + * Also masks reserved bits (63-22, 15, 5, 3, 1). + */ +#define FLAG_MASK 0x54dd5UL /* set's the trap flag. */ #define TRAP_FLAG 0x100UL |