diff options
| author | Andy Lutomirski <luto@kernel.org> | 2016-04-26 21:23:29 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-04-29 11:56:42 +0200 |
| commit | 296f781a4b7801ad9c1c0219f9e87b6c25e196fe (patch) | |
| tree | 6ef66ab7f992aebabaeb40069919d217f35837fb /arch/x86/include/asm | |
| parent | x86/arch_prctl/64: Remove FSBASE/GSBASE < 4G optimization (diff) | |
| download | linux-296f781a4b7801ad9c1c0219f9e87b6c25e196fe.tar.xz linux-296f781a4b7801ad9c1c0219f9e87b6c25e196fe.zip | |
x86/asm/64: Rename thread_struct's fs and gs to fsbase and gsbase
Unlike ds and es, these are base addresses, not selectors. Rename
them so their meaning is more obvious.
On x86_32, the field is still called fs. Fixing that could make sense
as a future cleanup.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/69a18a51c4cba0ce29a241e570fc618ad721d908.1461698311.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/elf.h | 6 | ||||
| -rw-r--r-- | arch/x86/include/asm/processor.h | 11 |
2 files changed, 12 insertions, 5 deletions
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h index 15340e36ddcb..fea7724141a0 100644 --- a/arch/x86/include/asm/elf.h +++ b/arch/x86/include/asm/elf.h @@ -176,7 +176,7 @@ static inline void elf_common_init(struct thread_struct *t, regs->si = regs->di = regs->bp = 0; regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0; regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; - t->fs = t->gs = 0; + t->fsbase = t->gsbase = 0; t->fsindex = t->gsindex = 0; t->ds = t->es = ds; } @@ -226,8 +226,8 @@ do { \ (pr_reg)[18] = (regs)->flags; \ (pr_reg)[19] = (regs)->sp; \ (pr_reg)[20] = (regs)->ss; \ - (pr_reg)[21] = current->thread.fs; \ - (pr_reg)[22] = current->thread.gs; \ + (pr_reg)[21] = current->thread.fsbase; \ + (pr_reg)[22] = current->thread.gsbase; \ asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 9264476f3d57..9251aa962721 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -388,9 +388,16 @@ struct thread_struct { unsigned long ip; #endif #ifdef CONFIG_X86_64 - unsigned long fs; + unsigned long fsbase; + unsigned long gsbase; +#else + /* + * XXX: this could presumably be unsigned short. Alternatively, + * 32-bit kernels could be taught to use fsindex instead. + */ + unsigned long fs; + unsigned long gs; #endif - unsigned long gs; /* Save middle states of ptrace breakpoints */ struct perf_event *ptrace_bps[HBP_NUM]; |