redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

x86/debug: Drop several unnecessary CFI annotations

Browse source 
With the conversion of the register saving code from macros to
functions, and with those functions not clobbering most of the
registers they spill, there's no need to annotate most of the
spill operations; the only exceptions being %rbx (always
modified) and %rcx (modified on the error_kernelspace: path).

Also remove a bogus commented out annotation - there's no
register %orig_rax after all.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/53AAE69A020000780001D3C7@mail.emea.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jan Beulich 2014-06-25 14:11:22 +01:00 committed by Ingo Molnar
parent 1795cd9b3a
commit 3bab13b015
1 changed files with 26 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

52
arch/x86/kernel/entry_64.S
View file

@ -207,7 +207,6 @@ ENDPROC(native_usergs_sysret64)
*/
.macro XCPT_FRAME start=1 offset=0
INTR_FRAME \start, RIP+\offset-ORIG_RAX
/*CFI_REL_OFFSET orig_rax, ORIG_RAX-ORIG_RAX*/
.endm
/*
@ -287,21 +286,21 @@ ENDPROC(native_usergs_sysret64)
ENTRY(save_paranoid)
XCPT_FRAME 1 RDI+8
cld
movq_cfi rdi, RDI+8
movq_cfi rsi, RSI+8
movq %rdi, RDI+8(%rsp)
movq %rsi, RSI+8(%rsp)
movq_cfi rdx, RDX+8
movq_cfi rcx, RCX+8
movq_cfi rax, RAX+8
movq_cfi r8, R8+8
movq_cfi r9, R9+8
movq_cfi r10, R10+8
movq_cfi r11, R11+8
movq %r8, R8+8(%rsp)
movq %r9, R9+8(%rsp)
movq %r10, R10+8(%rsp)
movq %r11, R11+8(%rsp)
movq_cfi rbx, RBX+8
movq_cfi rbp, RBP+8
movq_cfi r12, R12+8
movq_cfi r13, R13+8
movq_cfi r14, R14+8
movq_cfi r15, R15+8
movq %rbp, RBP+8(%rsp)
movq %r12, R12+8(%rsp)
movq %r13, R13+8(%rsp)
movq %r14, R14+8(%rsp)
movq %r15, R15+8(%rsp)
movl $1,%ebx
movl $MSR_GS_BASE,%ecx
rdmsr
@ -1395,21 +1394,21 @@ ENTRY(error_entry)
CFI_ADJUST_CFA_OFFSET 15*8
/* oldrax contains error code */
cld
movq_cfi rdi, RDI+8
movq_cfi rsi, RSI+8
movq_cfi rdx, RDX+8
movq_cfi rcx, RCX+8
movq_cfi rax, RAX+8
movq_cfi r8, R8+8
movq_cfi r9, R9+8
movq_cfi r10, R10+8
movq_cfi r11, R11+8
movq %rdi, RDI+8(%rsp)
movq %rsi, RSI+8(%rsp)
movq %rdx, RDX+8(%rsp)
movq %rcx, RCX+8(%rsp)
movq %rax, RAX+8(%rsp)
movq %r8, R8+8(%rsp)
movq %r9, R9+8(%rsp)
movq %r10, R10+8(%rsp)
movq %r11, R11+8(%rsp)
movq_cfi rbx, RBX+8
movq_cfi rbp, RBP+8
movq_cfi r12, R12+8
movq_cfi r13, R13+8
movq_cfi r14, R14+8
movq_cfi r15, R15+8
movq %rbp, RBP+8(%rsp)
movq %r12, R12+8(%rsp)
movq %r13, R13+8(%rsp)
movq %r14, R14+8(%rsp)
movq %r15, R15+8(%rsp)
xorl %ebx,%ebx
testl $3,CS+8(%rsp)
je error_kernelspace
@ -1427,6 +1426,7 @@ error_sti:
* compat mode. Check for these here too.
*/
error_kernelspace:
CFI_REL_OFFSET rcx, RCX+8
incl %ebx
leaq irq_return_iret(%rip),%rcx
cmpq %rcx,RIP+8(%rsp)