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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2013-03-04 23:10:32 (GMT) |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2013-03-04 23:10:32 (GMT) |
| commit | ee2c25efdd46d7ed5605d6fe877bdf4b47a4ab2e (patch) | |
| tree | 35890281e93e667a8e262d76ef250025eb30a8c1 /arch/x86/lib/getuser.S | |
| parent | 3ab66e8a455a4877889c65a848f2fb32be502f2c (diff) | |
| parent | 6dbe51c251a327e012439c4772097a13df43c5b8 (diff) | |
| download | linux-ee2c25efdd46d7ed5605d6fe877bdf4b47a4ab2e.tar.xz | |
Merge branch 'master' into queue
* master: (15791 commits)
Linux 3.9-rc1
btrfs/raid56: Add missing #include <linux/vmalloc.h>
fix compat_sys_rt_sigprocmask()
SUNRPC: One line comment fix
ext4: enable quotas before orphan cleanup
ext4: don't allow quota mount options when quota feature enabled
ext4: fix a warning from sparse check for ext4_dir_llseek
ext4: convert number of blocks to clusters properly
ext4: fix possible memory leak in ext4_remount()
jbd2: fix ERR_PTR dereference in jbd2__journal_start
metag: Provide dma_get_sgtable()
metag: prom.h: remove declaration of metag_dt_memblock_reserve()
metag: copy devicetree to non-init memory
metag: cleanup metag_ksyms.c includes
metag: move mm/init.c exports out of metag_ksyms.c
metag: move usercopy.c exports out of metag_ksyms.c
metag: move setup.c exports out of metag_ksyms.c
metag: move kick.c exports out of metag_ksyms.c
metag: move traps.c exports out of metag_ksyms.c
metag: move irq enable out of irqflags.h on SMP
...
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Conflicts:
arch/x86/kernel/kvmclock.c
Diffstat (limited to 'arch/x86/lib/getuser.S')
| -rw-r--r-- | arch/x86/lib/getuser.S | 43 |
1 files changed, 35 insertions, 8 deletions
diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S index 156b9c8..a451235 100644 --- a/arch/x86/lib/getuser.S +++ b/arch/x86/lib/getuser.S @@ -15,11 +15,10 @@ * __get_user_X * * Inputs: %[r|e]ax contains the address. - * The register is modified, but all changes are undone - * before returning because the C code doesn't know about it. * * Outputs: %[r|e]ax is error code (0 or -EFAULT) * %[r|e]dx contains zero-extended value + * %ecx contains the high half for 32-bit __get_user_8 * * * These functions should not modify any other registers, @@ -42,7 +41,7 @@ ENTRY(__get_user_1) cmp TI_addr_limit(%_ASM_DX),%_ASM_AX jae bad_get_user ASM_STAC -1: movzb (%_ASM_AX),%edx +1: movzbl (%_ASM_AX),%edx xor %eax,%eax ASM_CLAC ret @@ -72,29 +71,42 @@ ENTRY(__get_user_4) cmp TI_addr_limit(%_ASM_DX),%_ASM_AX jae bad_get_user ASM_STAC -3: mov -3(%_ASM_AX),%edx +3: movl -3(%_ASM_AX),%edx xor %eax,%eax ASM_CLAC ret CFI_ENDPROC ENDPROC(__get_user_4) -#ifdef CONFIG_X86_64 ENTRY(__get_user_8) CFI_STARTPROC +#ifdef CONFIG_X86_64 add $7,%_ASM_AX jc bad_get_user GET_THREAD_INFO(%_ASM_DX) cmp TI_addr_limit(%_ASM_DX),%_ASM_AX - jae bad_get_user + jae bad_get_user ASM_STAC -4: movq -7(%_ASM_AX),%_ASM_DX +4: movq -7(%_ASM_AX),%rdx xor %eax,%eax ASM_CLAC ret +#else + add $7,%_ASM_AX + jc bad_get_user_8 + GET_THREAD_INFO(%_ASM_DX) + cmp TI_addr_limit(%_ASM_DX),%_ASM_AX + jae bad_get_user_8 + ASM_STAC +4: movl -7(%_ASM_AX),%edx +5: movl -3(%_ASM_AX),%ecx + xor %eax,%eax + ASM_CLAC + ret +#endif CFI_ENDPROC ENDPROC(__get_user_8) -#endif + bad_get_user: CFI_STARTPROC @@ -105,9 +117,24 @@ bad_get_user: CFI_ENDPROC END(bad_get_user) +#ifdef CONFIG_X86_32 +bad_get_user_8: + CFI_STARTPROC + xor %edx,%edx + xor %ecx,%ecx + mov $(-EFAULT),%_ASM_AX + ASM_CLAC + ret + CFI_ENDPROC +END(bad_get_user_8) +#endif + _ASM_EXTABLE(1b,bad_get_user) _ASM_EXTABLE(2b,bad_get_user) _ASM_EXTABLE(3b,bad_get_user) #ifdef CONFIG_X86_64 _ASM_EXTABLE(4b,bad_get_user) +#else + _ASM_EXTABLE(4b,bad_get_user_8) + _ASM_EXTABLE(5b,bad_get_user_8) #endif |