diff options
| author | Glauber Costa <gcosta@redhat.com> | 2008-06-24 11:37:57 -0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-09 09:14:04 +0200 |
| commit | 40faf463e62de0b29722910eded7dd26cd8b684b (patch) | |
| tree | ab7a576aec523d750944c53f6c7f340b4a1a3a3a /arch/x86/lib/getuser_64.S | |
| parent | ef8c1a2d0e990d0f4f15e1d45eeb262755e3d4c3 (diff) | |
x86: introduce __ASM_REG macro.
There are situations in which the architecture wants to use the
register that represents its word-size, whatever it is. For those,
introduce __ASM_REG in asm.h, along with the first users _ASM_AX
and _ASM_DX. They have users waiting for it, namely the getuser
functions.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib/getuser_64.S')
| -rw-r--r-- | arch/x86/lib/getuser_64.S | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/arch/x86/lib/getuser_64.S b/arch/x86/lib/getuser_64.S index 6134752a75f..63b0e5c1e58 100644 --- a/arch/x86/lib/getuser_64.S +++ b/arch/x86/lib/getuser_64.S @@ -13,14 +13,13 @@ /* * __get_user_X * - * Inputs: %rcx contains the address. + * Inputs: %rax contains the address. * The register is modified, but all changes are undone * before returning because the C code doesn't know about it. * * Outputs: %rax is error code (0 or -EFAULT) * %rdx contains zero-extended value * - * %r8 is destroyed. * * These functions should not modify any other registers, * as they get called from within inline assembly. @@ -32,14 +31,15 @@ #include <asm/errno.h> #include <asm/asm-offsets.h> #include <asm/thread_info.h> +#include <asm/asm.h> .text ENTRY(__get_user_1) CFI_STARTPROC - GET_THREAD_INFO(%rdx) - cmp TI_addr_limit(%rdx),%rax + GET_THREAD_INFO(%_ASM_DX) + cmp TI_addr_limit(%_ASM_DX),%_ASM_AX jae bad_get_user -1: movzb (%rax),%edx +1: movzb (%_ASM_AX),%edx xor %eax,%eax ret CFI_ENDPROC @@ -47,12 +47,12 @@ ENDPROC(__get_user_1) ENTRY(__get_user_2) CFI_STARTPROC - add $1,%rax + add $1,%_ASM_AX jc bad_get_user - GET_THREAD_INFO(%rdx) - cmp TI_addr_limit(%rdx),%rax + GET_THREAD_INFO(%_ASM_DX) + cmp TI_addr_limit(%_ASM_DX),%_ASM_AX jae bad_get_user -2: movzwl -1(%rax),%edx +2: movzwl -1(%_ASM_AX),%edx xor %eax,%eax ret CFI_ENDPROC @@ -60,12 +60,12 @@ ENDPROC(__get_user_2) ENTRY(__get_user_4) CFI_STARTPROC - add $3,%rax + add $3,%_ASM_AX jc bad_get_user - GET_THREAD_INFO(%rdx) - cmp TI_addr_limit(%rdx),%rax + GET_THREAD_INFO(%_ASM_DX) + cmp TI_addr_limit(%_ASM_DX),%_ASM_AX jae bad_get_user -3: mov -3(%rax),%edx +3: mov -3(%_ASM_AX),%edx xor %eax,%eax ret CFI_ENDPROC @@ -73,12 +73,12 @@ ENDPROC(__get_user_4) ENTRY(__get_user_8) CFI_STARTPROC - add $7,%rax + add $7,%_ASM_AX jc bad_get_user - GET_THREAD_INFO(%rdx) - cmp TI_addr_limit(%rdx),%rax + GET_THREAD_INFO(%_ASM_DX) + cmp TI_addr_limit(%_ASM_DX),%_ASM_AX jae bad_get_user -4: movq -7(%rax),%rdx +4: movq -7(%_ASM_AX),%_ASM_DX xor %eax,%eax ret CFI_ENDPROC @@ -87,7 +87,7 @@ ENDPROC(__get_user_8) bad_get_user: CFI_STARTPROC xor %edx,%edx - mov $(-EFAULT),%rax + mov $(-EFAULT),%_ASM_AX ret CFI_ENDPROC END(bad_get_user) |