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| author |   H. Peter Anvin <hpa@zytor.com> | 2009-10-09 15:56:53 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-10-09 16:26:38 -0700 |
| commit | e634d8fc792c66c3d4ff45518c04848c1e28f221 (patch) | |
| tree | d72159bc7b95af55f97ffe4688bee22403c66d79 /arch/x86/kernel/process_64.c | |
| parent | x86-64: make compat_start_thread() match start_thread() (diff) | |
| download | linux-dev-e634d8fc792c66c3d4ff45518c04848c1e28f221.tar.xz linux-dev-e634d8fc792c66c3d4ff45518c04848c1e28f221.zip | |
x86-64: merge the standard and compat start_thread() functions
The only thing left that differs between the standard and compat
start_thread functions is the actual segment numbers and the
prototype, so have a single common function which contains the guts
and two very small wrappers.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 39 |
1 files changed, 17 insertions, 22 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 7cf0a6b6d4bb..eb261c582a44 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -344,18 +344,20 @@ out: return err; } -void -start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp) +static void +start_thread_common(struct pt_regs *regs, unsigned long new_ip, + unsigned long new_sp, + unsigned int _cs, unsigned int _ss, unsigned int _ds) { loadsegment(fs, 0); - loadsegment(es, 0); - loadsegment(ds, 0); + loadsegment(es, _ds); + loadsegment(ds, _ds); load_gs_index(0); regs->ip = new_ip; regs->sp = new_sp; percpu_write(old_rsp, new_sp); - regs->cs = __USER_CS; - regs->ss = __USER_DS; + regs->cs = _cs; + regs->ss = _ss; regs->flags = X86_EFLAGS_IF; set_fs(USER_DS); /* @@ -363,26 +365,19 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp) */ free_thread_xstate(current); } -EXPORT_SYMBOL_GPL(start_thread); + +void +start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp) +{ + start_thread_common(regs, new_ip, new_sp, + __USER_CS, __USER_DS, 0); +} #ifdef CONFIG_IA32_EMULATION void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp) { - loadsegment(fs, 0); - loadsegment(ds, __USER32_DS); - loadsegment(es, __USER32_DS); - load_gs_index(0); - regs->ip = new_ip; - regs->sp = new_sp; - percpu_write(old_rsp, new_sp); - regs->cs = __USER32_CS; - regs->ss = __USER32_DS; - regs->flags = X86_EFLAGS_IF; - set_fs(USER_DS); - /* - * Free the old FP and other extended state - */ - free_thread_xstate(current); + start_thread_common(regs, new_ip, new_sp, + __USER32_CS, __USER32_DS, __USER32_DS); } #endif |