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Commit 60923df3 authored Jan 11, 2006 by Chuck Ebbert Committed by Linus Torvalds Jan 11, 2006

[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>

parent 100c0e36

arch/x86_64/ia32/ptrace32.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -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

arch/x86_64/kernel/ptrace.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -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