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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
View File

@@ -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;
}

38
arch/sh/kernel/signal_64.c
View File

@@ -561,13 +561,11 @@ static int setup_frame(int sig, struct k_sigaction *ka,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
/*
* On SH5 all edited pointers are subject to NEFF
*/
DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
DEREF_REG_PR = neff_sign_extend((unsigned long)
ka->sa.sa_restorer | 0x1);
} else {
/*
* Different approach on SH5.
@@ -580,9 +578,8 @@ static int setup_frame(int sig, struct k_sigaction *ka,
* . being code, linker turns ShMedia bit on, always
* dereference index -1.
*/
DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
DEREF_REG_PR = neff_sign_extend((unsigned long)
frame->retcode | 0x01);
if (__copy_to_user(frame->retcode,
(void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0)
@@ -596,9 +593,7 @@ static int setup_frame(int sig, struct k_sigaction *ka,
* Set up registers for signal handler.
* All edited pointers are subject to NEFF.
*/
regs->regs[REG_SP] = (unsigned long) frame;
regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
(regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
/* FIXME:
@@ -613,8 +608,7 @@ static int setup_frame(int sig, struct k_sigaction *ka,
regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
regs->pc = (unsigned long) ka->sa.sa_handler;
regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
set_fs(USER_DS);
@@ -676,13 +670,11 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
/*
* On SH5 all edited pointers are subject to NEFF
*/
DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
DEREF_REG_PR = neff_sign_extend((unsigned long)
ka->sa.sa_restorer | 0x1);
} else {
/*
* Different approach on SH5.
@@ -695,15 +687,14 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
* . being code, linker turns ShMedia bit on, always
* dereference index -1.
*/
DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
DEREF_REG_PR = neff_sign_extend((unsigned long)
frame->retcode | 0x01);
if (__copy_to_user(frame->retcode,
(void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0)
goto give_sigsegv;
/* Cohere the trampoline with the I-cache. */
flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
}
@@ -711,14 +702,11 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
* Set up registers for signal handler.
* All edited pointers are subject to NEFF.
*/
regs->regs[REG_SP] = (unsigned long) frame;
regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
(regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame);
regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
regs->pc = (unsigned long) ka->sa.sa_handler;
regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler);
set_fs(USER_DS);