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-rw-r--r--arch/x86/kernel/entry_64.S34
1 files changed, 13 insertions, 21 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 048f2240f8e6..c1d01e6ca790 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -828,23 +828,6 @@ int_restore_rest:
CFI_ENDPROC
END(system_call)
-/*
- * Certain special system calls that need to save a complete full stack frame.
- */
- .macro PTREGSCALL label,func,arg
-ENTRY(\label)
- PARTIAL_FRAME 1 8 /* offset 8: return address */
- subq $REST_SKIP, %rsp
- CFI_ADJUST_CFA_OFFSET REST_SKIP
- call save_rest
- DEFAULT_FRAME 0 8 /* offset 8: return address */
- leaq 8(%rsp), \arg /* pt_regs pointer */
- call \func
- jmp ptregscall_common
- CFI_ENDPROC
-END(\label)
- .endm
-
.macro FORK_LIKE func
ENTRY(stub_\func)
CFI_STARTPROC
@@ -861,10 +844,22 @@ ENTRY(stub_\func)
END(stub_\func)
.endm
+ .macro FIXED_FRAME label,func
+ENTRY(\label)
+ CFI_STARTPROC
+ PARTIAL_FRAME 0 8 /* offset 8: return address */
+ FIXUP_TOP_OF_STACK %r11, 8-ARGOFFSET
+ call \func
+ RESTORE_TOP_OF_STACK %r11, 8-ARGOFFSET
+ ret
+ CFI_ENDPROC
+END(\label)
+ .endm
+
FORK_LIKE clone
FORK_LIKE fork
FORK_LIKE vfork
- PTREGSCALL stub_iopl, sys_iopl, %rsi
+ FIXED_FRAME stub_iopl, sys_iopl
ENTRY(ptregscall_common)
DEFAULT_FRAME 1 8 /* offset 8: return address */
@@ -886,7 +881,6 @@ ENTRY(stub_execve)
SAVE_REST
FIXUP_TOP_OF_STACK %r11
call sys_execve
- RESTORE_TOP_OF_STACK %r11
movq %rax,RAX(%rsp)
RESTORE_REST
jmp int_ret_from_sys_call
@@ -902,7 +896,6 @@ ENTRY(stub_rt_sigreturn)
addq $8, %rsp
PARTIAL_FRAME 0
SAVE_REST
- movq %rsp,%rdi
FIXUP_TOP_OF_STACK %r11
call sys_rt_sigreturn
movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer
@@ -917,7 +910,6 @@ ENTRY(stub_x32_rt_sigreturn)
addq $8, %rsp
PARTIAL_FRAME 0
SAVE_REST
- movq %rsp,%rdi
FIXUP_TOP_OF_STACK %r11
call sys32_x32_rt_sigreturn
movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer