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authorTejun Heo <tj@kernel.org>2009-02-09 16:17:40 +0300
committerIngo Molnar <mingo@elte.hu>2009-02-10 02:42:00 +0300
commitccbeed3a05908d201b47b6c3dd1a373138bba566 (patch)
treee834d548c70426aa3885dd2169be1a79be4a617b /arch/x86/include/asm/ptrace.h
parentd9a89a26e02ef9ed03f74a755a8b4d8f3a066622 (diff)
downloadlinux-ccbeed3a05908d201b47b6c3dd1a373138bba566.tar.xz
x86: make lazy %gs optional on x86_32
Impact: pt_regs changed, lazy gs handling made optional, add slight overhead to SAVE_ALL, simplifies error_code path a bit On x86_32, %gs hasn't been used by kernel and handled lazily. pt_regs doesn't have place for it and gs is saved/loaded only when necessary. In preparation for stack protector support, this patch makes lazy %gs handling optional by doing the followings. * Add CONFIG_X86_32_LAZY_GS and place for gs in pt_regs. * Save and restore %gs along with other registers in entry_32.S unless LAZY_GS. Note that this unfortunately adds "pushl $0" on SAVE_ALL even when LAZY_GS. However, it adds no overhead to common exit path and simplifies entry path with error code. * Define different user_gs accessors depending on LAZY_GS and add lazy_save_gs() and lazy_load_gs() which are noop if !LAZY_GS. The lazy_*_gs() ops are used to save, load and clear %gs lazily. * Define ELF_CORE_COPY_KERNEL_REGS() which always read %gs directly. xen and lguest changes need to be verified. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/ptrace.h')
-rw-r--r--arch/x86/include/asm/ptrace.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index 6d34d954c228..e304b66abeea 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -28,7 +28,7 @@ struct pt_regs {
int xds;
int xes;
int xfs;
- /* int gs; */
+ int xgs;
long orig_eax;
long eip;
int xcs;
@@ -50,7 +50,7 @@ struct pt_regs {
unsigned long ds;
unsigned long es;
unsigned long fs;
- /* int gs; */
+ unsigned long gs;
unsigned long orig_ax;
unsigned long ip;
unsigned long cs;