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sh: Tidy up NEFF-based sign extension for SH-5.

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This consolidates all of the NEFF-based sign extension for SH-5.
In the future the other SH code will need to make use of this as well,
so make it generic in preparation for more 32/64 consolidation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2009-08-04 17:14:39 +09:00
parent c0fe478dbb
commit c7914834ef
6 changed files with 36 additions and 66 deletions
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24
arch/sh/kernel/process_64.c
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@@ -425,7 +425,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
unsigned long long se; /* Sign extension */
#ifdef CONFIG_SH_FPU
if(last_task_used_math == current) {
@@ -441,11 +440,19 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
*childregs = *regs;
/*
* Sign extend the edited stack.
* Note that thread.pc and thread.pc will stay
* 32-bit wide and context switch must take care
* of NEFF sign extension.
*/
if (user_mode(regs)) {
childregs->regs[15] = usp;
childregs->regs[15] = neff_sign_extend(usp);
p->thread.uregs = childregs;
} else {
childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE;
childregs->regs[15] =
neff_sign_extend((unsigned long)task_stack_page(p) +
THREAD_SIZE);
}
childregs->regs[9] = 0; /* Set return value for child */
@@ -454,17 +461,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
p->thread.sp = (unsigned long) childregs;
p->thread.pc = (unsigned long) ret_from_fork;
/*
* Sign extend the edited stack.
* Note that thread.pc and thread.pc will stay
* 32-bit wide and context switch must take care
* of NEFF sign extension.
*/
se = childregs->regs[15];
se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se;
childregs->regs[15] = se;
return 0;
}