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[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>
This commit is contained in:
Chuck Ebbert 2006-01-11 22:46:03 +01:00 committed by Linus Torvalds
parent 100c0e3685
commit 60923df35e
2 changed files with 12 additions and 6 deletions
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9
arch/x86_64/ia32/ptrace32.c
View File

@ -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

9
arch/x86_64/kernel/ptrace.c
View File

@ -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