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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-11-19 22:00:52 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-02-03 18:16:24 -0500 |
| commit | b3af11afe06abdcf980b5f5c0b44dc46c496ddc3 (patch) | |
| tree | 3f784880fd8f14734dd3fd19a5a5a3757df0d44c /arch/x86/kernel/entry_64.S | |
| parent | ea93a6e2e73c5a1a8d1d60098f1ca5618fd5aca1 (diff) | |
| download | lwn-b3af11afe06abdcf980b5f5c0b44dc46c496ddc3.tar.gz lwn-b3af11afe06abdcf980b5f5c0b44dc46c496ddc3.zip | |
x86: get rid of pt_regs argument of iopl(2)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/kernel/entry_64.S')
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 31 |
1 files changed, 13 insertions, 18 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 2f2f57ac3748..4486fee3999f 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 */ |