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x86-64: merge the standard and compat start_thread() functions

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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>
This commit is contained in:
H. Peter Anvin 2009-10-09 15:56:53 -07:00
parent a6f05a6a0a
commit e634d8fc79
1 changed files with 17 additions and 22 deletions
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39
arch/x86/kernel/process_64.c
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@ -344,18 +344,20 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
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