static inline void __user *get_sigframe(struct k_sigaction *ka,
struct pt_regs *regs, size_t frame_size)
{
unsigned long sp = regs->sp;
int onsigstack = on_sig_stack(sp);
/* */
sp -= STACK_FRAME_OVERHEAD;
/* */
if ((ka->sa.sa_flags & SA_ONSTACK) && !onsigstack) {
if (current->sas_ss_size)
sp = current->sas_ss_sp + current->sas_ss_size;
}
sp = align_sigframe(sp - frame_size);
/*
*/
if (onsigstack && !likely(on_sig_stack(sp)))
return (void __user *)-1L;
return (void __user *)sp;
}
static inline void __user *get_sigframe(struct ksignal *ksig,
struct pt_regs *regs, size_t frame_size)
{
unsigned long sp = regs->sp;
/* redzone */
sp -= STACK_FRAME_OVERHEAD;
sp = sigsp(sp, ksig);
sp = align_sigframe(sp - frame_size);
return (void __user *)sp;
}
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
void __user **fpstate)
{
/* Default to using normal stack */
unsigned long math_size = 0;
unsigned long sp = regs->sp;
unsigned long buf_fx = 0;
int onsigstack = on_sig_stack(sp);
/* redzone */
if (config_enabled(CONFIG_X86_64))
sp -= 128;
if (!onsigstack) {
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
if (current->sas_ss_size)
sp = current->sas_ss_sp + current->sas_ss_size;
} else if (config_enabled(CONFIG_X86_32) &&
(regs->ss & 0xffff) != __USER_DS &&
#ifdef CONFIG_KERNEL_MODE_LINUX
(regs->sp > TASK_SIZE) &&
#endif
!(ka->sa.sa_flags & SA_RESTORER) &&
ka->sa.sa_restorer) {
/* This is the legacy signal stack switching. */
sp = (unsigned long) ka->sa.sa_restorer;
}
}
if (used_math()) {
sp = alloc_mathframe(sp, config_enabled(CONFIG_X86_32),
&buf_fx, &math_size);
*fpstate = (void __user *)sp;
}
sp = align_sigframe(sp - frame_size);
/*
* If we are on the alternate signal stack and would overflow it, don't.
* Return an always-bogus address instead so we will die with SIGSEGV.
*/
if (onsigstack && !likely(on_sig_stack(sp)))
return (void __user *)-1L;
/* save i387 and extended state */
if (used_math() &&
save_xstate_sig(*fpstate, (void __user *)buf_fx, math_size) < 0)
return (void __user *)-1L;
return (void __user *)sp;
}
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
void __user **fpstate)
{
/* Default to using normal stack */
unsigned long sp = regs->sp;
int onsigstack = on_sig_stack(sp);
#ifdef CONFIG_X86_64
/* redzone */
sp -= 128;
#endif /* CONFIG_X86_64 */
if (!onsigstack) {
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
if (current->sas_ss_size)
sp = current->sas_ss_sp + current->sas_ss_size;
} else {
#ifdef CONFIG_X86_32
/* This is the legacy signal stack switching. */
if ((regs->ss & 0xffff) != __USER_DS &&
!(ka->sa.sa_flags & SA_RESTORER) &&
ka->sa.sa_restorer)
sp = (unsigned long) ka->sa.sa_restorer;
#endif /* CONFIG_X86_32 */
}
}
if (used_math()) {
sp -= sig_xstate_size;
#ifdef CONFIG_X86_64
sp = round_down(sp, 64);
#endif /* CONFIG_X86_64 */
*fpstate = (void __user *)sp;
}
sp = align_sigframe(sp - frame_size);
/*
* If we are on the alternate signal stack and would overflow it, don't.
* Return an always-bogus address instead so we will die with SIGSEGV.
*/
if (onsigstack && !likely(on_sig_stack(sp)))
return (void __user *)-1L;
/* save i387 state */
if (used_math() && save_i387_xstate(*fpstate) < 0)
return (void __user *)-1L;
return (void __user *)sp;
}
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
void __user **fpstate)
{
/* */
unsigned long sp = regs->sp;
int onsigstack = on_sig_stack(sp);
#ifdef CONFIG_X86_64
/* */
sp -= 128;
#endif /* */
if (!onsigstack) {
/* */
if (ka->sa.sa_flags & SA_ONSTACK) {
if (current->sas_ss_size)
sp = current->sas_ss_sp + current->sas_ss_size;
} else {
#ifdef CONFIG_X86_32
/* */
if ((regs->ss & 0xffff) != __USER_DS &&
!(ka->sa.sa_flags & SA_RESTORER) &&
ka->sa.sa_restorer)
sp = (unsigned long) ka->sa.sa_restorer;
#endif /* */
}
}
if (used_math()) {
sp -= sig_xstate_size;
#ifdef CONFIG_X86_64
sp = round_down(sp, 64);
#endif /* */
*fpstate = (void __user *)sp;
}
sp = align_sigframe(sp - frame_size);
/*
*/
if (onsigstack && !likely(on_sig_stack(sp)))
return (void __user *)-1L;
/* */
if (used_math() && save_i387_xstate(*fpstate) < 0)
return (void __user *)-1L;
return (void __user *)sp;
}
