/*
* signal32.c: Support 32bit signal syscalls.
*
* Copyright (C) 2001 IBM
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
*
* These routines maintain argument size conversion between 32bit and 64bit
* environment.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/elf.h>
#include <linux/compat.h>
#include <asm/ppc32.h>
#include <asm/uaccess.h>
#include <asm/ppcdebug.h>
#include <asm/unistd.h>
#include <asm/cacheflush.h>
#define DEBUG_SIG 0
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
/*
* These are the flags in the MSR that the user is allowed to change
* by modifying the saved value of the MSR on the stack. SE and BE
* should not be in this list since gdb may want to change these. I.e,
* you should be able to step out of a signal handler to see what
* instruction executes next after the signal handler completes.
* Alternately, if you stepped into a signal handler, you should be
* able to continue 'til the next breakpoint from within the signal
* handler, even if the handler returns.
*/
#if 0
#define MSR_USERCHANGE (MSR_FE0 | MSR_FE1)
#else
/*
* glibc tries to set FE0/FE1 via a signal handler. Since it only ever
* sets both bits and this is the default setting we now disable this
* behaviour. This is done to insure the new prctl which alters FE0/FE1 does
* not get overriden by glibc. Setting and clearing FE0/FE1 via signal
* handler has always been bogus since load_up_fpu used to set FE0/FE1
* unconditionally.
*/
#define MSR_USERCHANGE 0
#endif
struct sigregs32 {
/*
* the gp_regs array is 32 bit representation of the pt_regs
* structure that was stored on the kernel stack during the
* system call that was interrupted for the signal.
*
* Note that the entire pt_regs regs structure will fit in
* the gp_regs structure because the ELF_NREG value is 48 for
* PPC and the pt_regs structure contains 44 registers
*/
elf_gregset_t32 gp_regs;
double fp_regs[ELF_NFPREG];
unsigned int tramp[2];
/*
* Programs using the rs6000/xcoff abi can save up to 19 gp
* regs and 18 fp regs below sp before decrementing it.
*/
int abigap[56];
};
struct rt_sigframe_32 {
/*
* Unused space at start of frame to allow for storing of
* stack pointers
*/
unsigned long _unused;
/*
* This is a 32 bit pointer in user address space
* it is a pointer to the siginfo stucture in the rt stack frame
*/
u32 pinfo;
/*
* This is a 32 bit pointer in user address space
* it is a pointer to the user context in the rt stack frame
*/
u32 puc;
struct siginfo32 info;
struct ucontext32 uc;
};
/*
* Start of nonRT signal support
*
* sigset_t is 32 bits for non-rt signals
*
* System Calls
* sigaction sys32_sigaction
* sigreturn sys32_sigreturn
*
* Note sigsuspend has no special 32 bit routine - uses the 64 bit routine
*
* Other routines
* setup_frame32
*/
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
long sys32_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
struct pt_regs *regs)
{
sigset_t saveset;
mask &= _BLOCKABLE;
spin_lock_irq(¤t->sighand->siglock);
saveset = current->blocked;
siginitset(¤t->blocked, mask);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
regs->result = -EINTR;
regs->gpr[3] = EINTR;
regs->ccr |= 0x10000000;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal32(&saveset, regs))
/*
* If a signal handler needs to be called,
* do_signal32() has set R3 to the signal number (the
* first argument of the signal handler), so don't
* overwrite that with EINTR !
* In the other cases, do_signal32() doesn't touch
* R3, so it's still set to -EINTR (see above).
*/
return regs->gpr[3];
}
}
long sys32_sigaction(int sig, struct old_sigaction32 *act,
struct old_sigaction32 *oact)
{
struct k_sigaction new_ka, old_ka;
int ret;
if (sig < 0)
sig = -sig;
if (act) {
compat_old_sigset_t mask;
if (get_user((long)new_ka.sa.sa_handler, &act->sa_handler) ||
__get_user((long)new_ka.sa.sa_restorer, &act->sa_restorer) ||
__get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
__get_user(mask, &act->sa_mask))
return -EFAULT;
siginitset(&new_ka.sa.sa_mask, mask);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
if (put_user((long)old_ka.sa.sa_handler, &oact->sa_handler) ||
__put_user((long)old_ka.sa.sa_restorer, &oact->sa_restorer) ||
__put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
return -EFAULT;
}
return ret;
}
/*
* When we have signals to deliver, we set up on the
* user stack, going down from the original stack pointer:
* a sigregs struct
* one or more sigcontext structs
* a gap of __SIGNAL_FRAMESIZE32 bytes
*
* Each of these things must be a multiple of 16 bytes in size.
*
*/
/*
* Do a signal return; undo the signal stack.
*/
long sys32_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7, unsigned long r8,
struct pt_regs *regs)
{
struct sigcontext32 *sc, sigctx;
struct sigregs32 *sr;
int ret;
elf_gregset_t32 saved_regs; /* an array of ELF_NGREG unsigned ints (32 bits) */
sigset_t set;
int i;
sc = (struct sigcontext32 *)(regs->gpr[1] + __SIGNAL_FRAMESIZE32);
if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
goto badframe;
/*
* Note that PPC32 puts the upper 32 bits of the sigmask in the
* unused part of the signal stackframe
*/
set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
if (regs->msr & MSR_FP )
giveup_fpu(current);
/* Last stacked signal - restore registers */
sr = (struct sigregs32*)(u64)sigctx.regs;
/*
* copy the 32 bit register values off the user stack
* into the 32 bit register area
*/
if (copy_from_user(saved_regs, &sr->gp_regs, sizeof(sr->gp_regs)))
goto badframe;
/*
* The saved reg structure in the frame is an elf_grepset_t32,
* it is a 32 bit register save of the registers in the
* pt_regs structure that was stored on the kernel stack
* during the system call when the system call was interrupted
* for the signal. Only 32 bits are saved because the
* sigcontext contains a pointer to the regs and the sig
* context address is passed as a pointer to the signal
* handler.
*
* The entries in the elf_grepset have the same index as the
* elements in the pt_regs structure.
*/
saved_regs[PT_MSR] = (regs->msr & ~MSR_USERCHANGE)
| (saved_regs[PT_MSR] & MSR_USERCHANGE);
/*
* Register 2 is the kernel toc - should be reset on
* any calls into the kernel
*/
for (i = 0; i < 32; i++)
regs->gpr[i] = (u64)(saved_regs[i]) & 0xFFFFFFFF;
/*
* restore the non gpr registers
*/
regs->msr = (u64)(saved_regs[PT_MSR]) & 0xFFFFFFFF;
/*
* Insure that the interrupt mode is 64 bit, during 32 bit
* execution. (This is necessary because we only saved
* lower 32 bits of msr.)
*/
regs->msr = regs->msr | MSR_ISF; /* When this thread is interrupted it should run in 64 bit mode. */
regs->nip = (u64)(saved_regs[PT_NIP]) & 0xFFFFFFFF;
regs->orig_gpr3 = (u64)(saved_regs[PT_ORIG_R3]) & 0xFFFFFFFF;
regs->ctr = (u64)(saved_regs[PT_CTR]) & 0xFFFFFFFF;
regs->link = (u64)(saved_regs[PT_LNK]) & 0xFFFFFFFF;
regs->xer = (u64)(saved_regs[PT_XER]) & 0xFFFFFFFF;
regs->ccr = (u64)(saved_regs[PT_CCR]) & 0xFFFFFFFF;
/* regs->softe is left unchanged (like the MSR.EE bit) */
/******************************************************/
/* the DAR and the DSISR are only relevant during a */
/* data or instruction storage interrupt. The value */
/* will be set to zero. */
/******************************************************/
regs->dar = 0;
regs->dsisr = 0;
regs->result = (u64)(saved_regs[PT_RESULT]) & 0xFFFFFFFF;
if (copy_from_user(current->thread.fpr, &sr->fp_regs,
sizeof(sr->fp_regs)))
goto badframe;
ret = regs->result;
return ret;
badframe:
do_exit(SIGSEGV);
}
/*
* Set up a signal frame.
*/
static void setup_frame32(struct pt_regs *regs, struct sigregs32 *frame,
unsigned int newsp)
{
struct sigcontext32 *sc = (struct sigcontext32 *)(u64)newsp;
int i;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
if (verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
goto badframe;
if (regs->msr & MSR_FP)
giveup_fpu(current);
/*
* Copy the register contents for the pt_regs structure on the
* kernel stack to the elf_gregset_t32 structure on the user
* stack. This is a copy of 64 bit register values to 32 bit
* register values. The high order 32 bits of the 64 bit
* registers are not needed since a 32 bit application is
* running and the saved registers are the contents of the
* user registers at the time of a system call.
*
* The values saved on the user stack will be restored into
* the registers during the signal return processing
*/
for (i = 0; i < 32; i++) {
if (__put_user((u32)regs->gpr[i], &frame->gp_regs[i]))
goto badframe;
}
/*
* Copy the non gpr registers to the user stack
*/
if (__put_user((u32)regs->gpr[PT_NIP], &frame->gp_regs[PT_NIP])
|| __put_user((u32)regs->gpr[PT_MSR], &frame->gp_regs[PT_MSR])
|| __put_user((u32)regs->gpr[PT_ORIG_R3], &frame->gp_regs[PT_ORIG_R3])
|| __put_user((u32)regs->gpr[PT_CTR], &frame->gp_regs[PT_CTR])
|| __put_user((u32)regs->gpr[PT_LNK], &frame->gp_regs[PT_LNK])
|| __put_user((u32)regs->gpr[PT_XER], &frame->gp_regs[PT_XER])
|| __put_user((u32)regs->gpr[PT_CCR], &frame->gp_regs[PT_CCR])
#if 0
|| __put_user((u32)regs->gpr[PT_MQ], &frame->gp_regs[PT_MQ])
#endif
|| __put_user((u32)regs->gpr[PT_RESULT], &frame->gp_regs[PT_RESULT]))
goto badframe;
/*
* Now copy the floating point registers onto the user stack
*
* Also set up so on the completion of the signal handler, the
* sys_sigreturn will get control to reset the stack
*/
if (__copy_to_user(&frame->fp_regs, current->thread.fpr,
ELF_NFPREG * sizeof(double))
/* li r0, __NR_sigreturn */
|| __put_user(0x38000000U + __NR_sigreturn, &frame->tramp[0])
/* sc */
|| __put_user(0x44000002U, &frame->tramp[1]))
goto badframe;
flush_icache_range((unsigned long)&frame->tramp[0],
(unsigned long)&frame->tramp[2]);
current->thread.fpscr = 0; /* turn off all fp exceptions */
newsp -= __SIGNAL_FRAMESIZE32;
if (put_user(regs->gpr[1], (u32*)(u64)newsp)
|| get_user(regs->nip, &sc->handler)
|| get_user(regs->gpr[3], &sc->signal))
goto badframe;
regs->gpr[1] = newsp & 0xFFFFFFFF;
/*
* first parameter to the signal handler is the signal number
* - the value is in gpr3
* second parameter to the signal handler is the sigcontext
* - set the value into gpr4
*/
regs->gpr[4] = (unsigned long) sc;
regs->link = (unsigned long) frame->tramp;
return;
badframe:
#if DEBUG_SIG
printk("badframe in setup_frame32, regs=%p frame=%p newsp=%lx\n",
regs, frame, newsp);
#endif
do_exit(SIGSEGV);
}
/*
* Start of RT signal support
*
* sigset_t is 64 bits for rt signals
*
* System Calls
* sigaction sys32_rt_sigaction
* sigpending sys32_rt_sigpending
* sigprocmask sys32_rt_sigprocmask
* sigreturn sys32_rt_sigreturn
* sigtimedwait sys32_rt_sigtimedwait
* sigqueueinfo sys32_rt_sigqueueinfo
* sigsuspend sys32_rt_sigsuspend
*
* Other routines
* setup_rt_frame32
* copy_siginfo_to_user32
* siginfo32to64
*/
/*
* This code executes after the rt signal handler in 32 bit mode has
* completed and returned
*/
long sys32_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7, unsigned long r8,
struct pt_regs * regs)
{
struct rt_sigframe_32 *rt_sf;
struct sigcontext32 sigctx;
struct sigregs32 *sr;
int ret;
elf_gregset_t32 saved_regs; /* an array of 32 bit register values */
sigset_t set;
stack_t st;
int i;
mm_segment_t old_fs;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
/* Adjust the inputted reg1 to point to the first rt signal frame */
rt_sf = (struct rt_sigframe_32 *)(regs->gpr[1] + __SIGNAL_FRAMESIZE32);
/* Copy the information from the user stack */
if (copy_from_user(&sigctx, &rt_sf->uc.uc_mcontext, sizeof(sigctx))
|| copy_from_user(&set, &rt_sf->uc.uc_sigmask, sizeof(set))
|| copy_from_user(&st,&rt_sf->uc.uc_stack, sizeof(st)))
goto badframe;
/*
* Unblock the signal that was processed
* After a signal handler runs -
* if the signal is blockable - the signal will be unblocked
* (sigkill and sigstop are not blockable)
*/
sigdelsetmask(&set, ~_BLOCKABLE);
/* update the current based on the sigmask found in the rt_stackframe */
spin_lock_irq(¤t->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
/* If currently owning the floating point - give them up */
if (regs->msr & MSR_FP)
giveup_fpu(current);
/*
* Set to point to the next rt_sigframe - this is used to
* determine whether this is the last signal to process
*/
sr = (struct sigregs32 *)(u64)sigctx.regs;
if (copy_from_user(saved_regs, &sr->gp_regs, sizeof(sr->gp_regs)))
goto badframe;
/*
* The saved reg structure in the frame is an elf_grepset_t32,
* it is a 32 bit register save of the registers in the
* pt_regs structure that was stored on the kernel stack
* during the system call when the system call was interrupted
* for the signal. Only 32 bits are saved because the
* sigcontext contains a pointer to the regs and the sig
* context address is passed as a pointer to the signal handler
*
* The entries in the elf_grepset have the same index as
* the elements in the pt_regs structure.
*/
saved_regs[PT_MSR] = (regs->msr & ~MSR_USERCHANGE)
| (saved_regs[PT_MSR] & MSR_USERCHANGE);
/*
* Register 2 is the kernel toc - should be reset on any
* calls into the kernel
*/
for (i = 0; i < 32; i++)
regs->gpr[i] = (u64)(saved_regs[i]) & 0xFFFFFFFF;
/*
* restore the non gpr registers
*/
regs->msr = (u64)(saved_regs[PT_MSR]) & 0xFFFFFFFF;
regs->nip = (u64)(saved_regs[PT_NIP]) & 0xFFFFFFFF;
regs->orig_gpr3 = (u64)(saved_regs[PT_ORIG_R3]) & 0xFFFFFFFF;
regs->ctr = (u64)(saved_regs[PT_CTR]) & 0xFFFFFFFF;
regs->link = (u64)(saved_regs[PT_LNK]) & 0xFFFFFFFF;
regs->xer = (u64)(saved_regs[PT_XER]) & 0xFFFFFFFF;
regs->ccr = (u64)(saved_regs[PT_CCR]) & 0xFFFFFFFF;
/* regs->softe is left unchanged (like MSR.EE) */
/*
* the DAR and the DSISR are only relevant during a
* data or instruction storage interrupt. The value
* will be set to zero.
*/
regs->dar = 0;
regs->dsisr = 0;
regs->result = (u64)(saved_regs[PT_RESULT]) & 0xFFFFFFFF;
if (copy_from_user(current->thread.fpr, &sr->fp_regs,
sizeof(sr->fp_regs)))
goto badframe;
/* This function sets back the stack flags into
the current task structure. */
old_fs = get_fs();
set_fs(KERNEL_DS);
do_sigaltstack(&st, NULL, regs->gpr[1]);
set_fs(old_fs);
ret = regs->result;
return ret;
badframe:
do_exit(SIGSEGV);
}
long sys32_rt_sigaction(int sig, const struct sigaction32 *act,
struct sigaction32 *oact, size_t sigsetsize)
{
struct k_sigaction new_ka, old_ka;
int ret;
compat_sigset_t set32;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (act) {
ret = get_user((long)new_ka.sa.sa_handler, &act->sa_handler);
ret |= __copy_from_user(&set32, &act->sa_mask,
sizeof(compat_sigset_t));
switch (_NSIG_WORDS) {
case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
| (((long)set32.sig[7]) << 32);
case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
| (((long)set32.sig[5]) << 32);
case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
| (((long)set32.sig[3]) << 32);
case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
| (((long)set32.sig[1]) << 32);
}
ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
if (ret)
return -EFAULT;
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
switch (_NSIG_WORDS) {
case 4:
set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
set32.sig[6] = old_ka.sa.sa_mask.sig[3];
case 3:
set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
set32.sig[4] = old_ka.sa.sa_mask.sig[2];
case 2:
set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
set32.sig[2] = old_ka.sa.sa_mask.sig[1];
case 1:
set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
set32.sig[0] = old_ka.sa.sa_mask.sig[0];
}
ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler);
ret |= __copy_to_user(&oact->sa_mask, &set32,
sizeof(compat_sigset_t));
ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
}
return ret;
}
/*
* Note: it is necessary to treat how as an unsigned int, with the
* corresponding cast to a signed int to insure that the proper
* conversion (sign extension) between the register representation
* of a signed int (msr in 32-bit mode) and the register representation
* of a signed int (msr in 64-bit mode) is performed.
*/
long sys32_rt_sigprocmask(u32 how, compat_sigset_t *set,
compat_sigset_t *oset, size_t sigsetsize)
{
sigset_t s;
compat_sigset_t s32;
int ret;
mm_segment_t old_fs = get_fs();
if (set) {
if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
return -EFAULT;
switch (_NSIG_WORDS) {
case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
}
}
set_fs(KERNEL_DS);
ret = sys_rt_sigprocmask((int)how, set ? &s : NULL, oset ? &s : NULL,
sigsetsize);
set_fs(old_fs);
if (ret)
return ret;
if (oset) {
switch (_NSIG_WORDS) {
case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
}
if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
return -EFAULT;
}
return 0;
}
long sys32_rt_sigpending(compat_sigset_t *set, compat_size_t sigsetsize)
{
sigset_t s;
compat_sigset_t s32;
int ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_rt_sigpending(&s, sigsetsize);
set_fs(old_fs);
if (!ret) {
switch (_NSIG_WORDS) {
case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
}
if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
return -EFAULT;
}
return ret;
}
static int copy_siginfo_to_user32(siginfo_t32 *d, siginfo_t *s)
{
int err;
if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
return -EFAULT;
err = __put_user(s->si_signo, &d->si_signo);
err |= __put_user(s->si_errno, &d->si_errno);
err |= __put_user((short)s->si_code, &d->si_code);
if (s->si_signo >= SIGRTMIN) {
err |= __put_user(s->si_pid, &d->si_pid);
err |= __put_user(s->si_uid, &d->si_uid);
err |= __put_user(s->si_int, &d->si_int);
} else {
switch (s->si_signo) {
/* XXX: What about POSIX1.b timers */
case SIGCHLD:
err |= __put_user(s->si_pid, &d->si_pid);
err |= __put_user(s->si_status, &d->si_status);
err |= __put_user(s->si_utime, &d->si_utime);
err |= __put_user(s->si_stime, &d->si_stime);
break;
case SIGSEGV:
case SIGBUS:
case SIGFPE:
case SIGILL:
err |= __put_user((long)(s->si_addr), &d->si_addr);
break;
case SIGPOLL:
err |= __put_user(s->si_band, &d->si_band);
err |= __put_user(s->si_fd, &d->si_fd);
break;
default:
err |= __put_user(s->si_pid, &d->si_pid);
err |= __put_user(s->si_uid, &d->si_uid);
break;
}
}
return err;
}
long sys32_rt_sigtimedwait(compat_sigset_t *uthese, siginfo_t32 *uinfo,
struct compat_timespec *uts, compat_size_t sigsetsize)
{
sigset_t s;
compat_sigset_t s32;
struct timespec t;
int ret;
mm_segment_t old_fs = get_fs();
siginfo_t info;
if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
return -EFAULT;
switch (_NSIG_WORDS) {
case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
}
if (uts && get_compat_timespec(&t, uts))
return -EFAULT;
set_fs(KERNEL_DS);
ret = sys_rt_sigtimedwait(&s, uinfo ? &info : NULL, uts ? &t : NULL,
sigsetsize);
set_fs(old_fs);
if (ret >= 0 && uinfo) {
if (copy_siginfo_to_user32(uinfo, &info))
return -EFAULT;
}
return ret;
}
static siginfo_t * siginfo32to64(siginfo_t *d, siginfo_t32 *s)
{
d->si_signo = s->si_signo;
d->si_errno = s->si_errno;
d->si_code = s->si_code;
if (s->si_signo >= SIGRTMIN) {
d->si_pid = s->si_pid;
d->si_uid = s->si_uid;
d->si_int = s->si_int;
} else {
switch (s->si_signo) {
/* XXX: What about POSIX1.b timers */
case SIGCHLD:
d->si_pid = s->si_pid;
d->si_status = s->si_status;
d->si_utime = s->si_utime;
d->si_stime = s->si_stime;
break;
case SIGSEGV:
case SIGBUS:
case SIGFPE:
case SIGILL:
d->si_addr = (void *)A(s->si_addr);
break;
case SIGPOLL:
d->si_band = s->si_band;
d->si_fd = s->si_fd;
break;
default:
d->si_pid = s->si_pid;
d->si_uid = s->si_uid;
break;
}
}
return d;
}
/*
* Note: it is necessary to treat pid and sig as unsigned ints, with the
* corresponding cast to a signed int to insure that the proper conversion
* (sign extension) between the register representation of a signed int
* (msr in 32-bit mode) and the register representation of a signed int
* (msr in 64-bit mode) is performed.
*/
long sys32_rt_sigqueueinfo(u32 pid, u32 sig, siginfo_t32 *uinfo)
{
siginfo_t info;
siginfo_t32 info32;
int ret;
mm_segment_t old_fs = get_fs();
if (copy_from_user (&info32, uinfo, sizeof(siginfo_t32)))
return -EFAULT;
/* XXX: Is this correct? */
siginfo32to64(&info, &info32);
set_fs (KERNEL_DS);
ret = sys_rt_sigqueueinfo((int)pid, (int)sig, &info);
set_fs (old_fs);
return ret;
}
int sys32_rt_sigsuspend(compat_sigset_t* unewset, size_t sigsetsize, int p3,
int p4, int p6, int p7, struct pt_regs *regs)
{
sigset_t saveset, newset;
compat_sigset_t s32;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&s32, unewset, sizeof(s32)))
return -EFAULT;
/*
* Swap the 2 words of the 64-bit sigset_t (they are stored
* in the "wrong" endian in 32-bit user storage).
*/
switch (_NSIG_WORDS) {
case 4: newset.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
case 3: newset.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
case 2: newset.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
case 1: newset.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
}
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
saveset = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
regs->result = -EINTR;
regs->gpr[3] = EINTR;
regs->ccr |= 0x10000000;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal32(&saveset, regs))
/*
* If a signal handler needs to be called,
* do_signal32() has set R3 to the signal number (the
* first argument of the signal handler), so don't
* overwrite that with EINTR !
* In the other cases, do_signal32() doesn't touch
* R3, so it's still set to -EINTR (see above).
*/
return regs->gpr[3];
}
}
/*
* Set up a rt signal frame.
*/
static void setup_rt_frame32(struct pt_regs *regs, struct sigregs32 *frame,
unsigned int newsp)
{
unsigned int copyreg4, copyreg5;
struct rt_sigframe_32 * rt_sf = (struct rt_sigframe_32 *) (u64)newsp;
int i;
if (verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
goto badframe;
if (regs->msr & MSR_FP)
giveup_fpu(current);
/*
* Copy the register contents for the pt_regs structure on the
* kernel stack to the elf_gregset_t32 structure on the user
* stack. This is a copy of 64 bit register values to 32 bit
* register values. The high order 32 bits of the 64 bit
* registers are not needed since a 32 bit application is
* running and the saved registers are the contents of the
* user registers at the time of a system call.
*
* The values saved on the user stack will be restored into
* the registers during the signal return processing
*/
for (i = 0; i < 32; i++) {
if (__put_user((u32)regs->gpr[i], &frame->gp_regs[i]))
goto badframe;
}
/*
* Copy the non gpr registers to the user stack
*/
if (__put_user((u32)regs->gpr[PT_NIP], &frame->gp_regs[PT_NIP])
|| __put_user((u32)regs->gpr[PT_MSR], &frame->gp_regs[PT_MSR])
|| __put_user((u32)regs->gpr[PT_ORIG_R3], &frame->gp_regs[PT_ORIG_R3])
|| __put_user((u32)regs->gpr[PT_CTR], &frame->gp_regs[PT_CTR])
|| __put_user((u32)regs->gpr[PT_LNK], &frame->gp_regs[PT_LNK])
|| __put_user((u32)regs->gpr[PT_XER], &frame->gp_regs[PT_XER])
|| __put_user((u32)regs->gpr[PT_CCR], &frame->gp_regs[PT_CCR])
|| __put_user((u32)regs->gpr[PT_RESULT], &frame->gp_regs[PT_RESULT]))
goto badframe;
/*
* Now copy the floating point registers onto the user stack
*
* Also set up so on the completion of the signal handler, the
* sys_sigreturn will get control to reset the stack
*/
if (__copy_to_user(&frame->fp_regs, current->thread.fpr,
ELF_NFPREG * sizeof(double))
|| __put_user(0x38000000U + __NR_rt_sigreturn, &frame->tramp[0]) /* li r0, __NR_rt_sigreturn */
|| __put_user(0x44000002U, &frame->tramp[1])) /* sc */
goto badframe;
flush_icache_range((unsigned long) &frame->tramp[0],
(unsigned long) &frame->tramp[2]);
current->thread.fpscr = 0; /* turn off all fp exceptions */
/*
* Retrieve rt_sigframe from stack and
* set up registers for signal handler
*/
newsp -= __SIGNAL_FRAMESIZE32;
if (put_user((u32)(regs->gpr[1]), (unsigned int *)(u64)newsp)
|| get_user(regs->nip, &rt_sf->uc.uc_mcontext.handler)
|| get_user(regs->gpr[3], &rt_sf->uc.uc_mcontext.signal)
|| get_user(copyreg4, &rt_sf->pinfo)
|| get_user(copyreg5, &rt_sf->puc))
goto badframe;
regs->gpr[4] = copyreg4;
regs->gpr[5] = copyreg5;
regs->gpr[1] = newsp;
regs->gpr[6] = (unsigned long) rt_sf;
regs->link = (unsigned long) frame->tramp;
return;
badframe:
#if DEBUG_SIG
printk("badframe in setup_frame32, regs=%p frame=%p newsp=%lx\n",
regs, frame, newsp);
#endif
do_exit(SIGSEGV);
}
/*
* OK, we're invoking a handler
*/
static void handle_signal32(unsigned long sig, siginfo_t *info,
sigset_t *oldset, struct pt_regs * regs, unsigned int *newspp,
unsigned int frame)
{
struct sigcontext32 *sc;
struct rt_sigframe_32 *rt_sf;
struct k_sigaction *ka = ¤t->sighand->action[sig-1];
if (regs->trap == 0x0C00 /* System Call! */
&& ((int)regs->result == -ERESTARTNOHAND ||
(int)regs->result == -ERESTART_RESTARTBLOCK ||
((int)regs->result == -ERESTARTSYS &&
!(ka->sa.sa_flags & SA_RESTART)))) {
if ((int)regs->result == -ERESTART_RESTARTBLOCK)
current_thread_info()->restart_block.fn
= do_no_restart_syscall;
regs->result = -EINTR;
}
/*
* Set up the signal frame
* Determine if a real time frame and a siginfo is required
*/
if (ka->sa.sa_flags & SA_SIGINFO) {
*newspp -= sizeof(*rt_sf);
rt_sf = (struct rt_sigframe_32 *)(u64)(*newspp);
if (verify_area(VERIFY_WRITE, rt_sf, sizeof(*rt_sf)))
goto badframe;
if (__put_user((u32)(u64)ka->sa.sa_handler,
&rt_sf->uc.uc_mcontext.handler)
|| __put_user((u32)(u64)&rt_sf->info, &rt_sf->pinfo)
|| __put_user((u32)(u64)&rt_sf->uc, &rt_sf->puc)
/* put the siginfo on the user stack */
|| copy_siginfo_to_user32(&rt_sf->info, info)
/* set the ucontext on the user stack */
|| __put_user(0, &rt_sf->uc.uc_flags)
|| __put_user(0, &rt_sf->uc.uc_link)
|| __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
|| __put_user(sas_ss_flags(regs->gpr[1]),
&rt_sf->uc.uc_stack.ss_flags)
|| __put_user(current->sas_ss_size,
&rt_sf->uc.uc_stack.ss_size)
|| __copy_to_user(&rt_sf->uc.uc_sigmask,
oldset, sizeof(*oldset))
/* point the mcontext.regs to the pramble register frame */
|| __put_user(frame, &rt_sf->uc.uc_mcontext.regs)
|| __put_user(sig,&rt_sf->uc.uc_mcontext.signal))
goto badframe;
} else {
/* Put a sigcontext on the stack */
*newspp -= sizeof(*sc);
sc = (struct sigcontext32 *)(u64)*newspp;
if (verify_area(VERIFY_WRITE, sc, sizeof(*sc)))
goto badframe;
/*
* Note the upper 32 bits of the signal mask are stored
* in the unused part of the signal stack frame
*/
if (__put_user((u32)(u64)ka->sa.sa_handler, &sc->handler)
|| __put_user(oldset->sig[0], &sc->oldmask)
|| __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
|| __put_user((unsigned int)frame, &sc->regs)
|| __put_user(sig, &sc->signal))
goto badframe;
}
if (ka->sa.sa_flags & SA_ONESHOT)
ka->sa.sa_handler = SIG_DFL;
if (!(ka->sa.sa_flags & SA_NODEFER)) {
spin_lock_irq(¤t->sighand->siglock);
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
sigaddset(¤t->blocked,sig);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
}
return;
badframe:
#if DEBUG_SIG
printk("badframe in handle_signal32, regs=%p frame=%lx newsp=%lx\n",
regs, frame, *newspp);
printk("sc=%p sig=%d ka=%p info=%p oldset=%p\n", sc, sig, ka, info, oldset);
#endif
do_exit(SIGSEGV);
}
/*
* Start Alternate signal stack support
*
* System Calls
* sigaltatck sys32_sigaltstack
*/
int sys32_sigaltstack(u32 newstack, u32 oldstack, int p3,
int p4, int p6, int p7, struct pt_regs *regs)
{
stack_t uss, uoss;
int ret;
mm_segment_t old_fs;
unsigned long sp;
/*
* set sp to the user stack on entry to the system call
* the system call router sets R9 to the saved registers
*/
sp = regs->gpr[1];
/* Put new stack info in local 64 bit stack struct */
if (newstack &&
(get_user((long)uss.ss_sp,
&((stack_32_t *)(long)newstack)->ss_sp) ||
__get_user(uss.ss_flags,
&((stack_32_t *)(long)newstack)->ss_flags) ||
__get_user(uss.ss_size,
&((stack_32_t *)(long)newstack)->ss_size)))
return -EFAULT;
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = do_sigaltstack(newstack ? &uss : NULL, oldstack ? &uoss : NULL,
sp);
set_fs(old_fs);
/* Copy the stack information to the user output buffer */
if (!ret && oldstack &&
(put_user((long)uoss.ss_sp,
&((stack_32_t *)(long)oldstack)->ss_sp) ||
__put_user(uoss.ss_flags,
&((stack_32_t *)(long)oldstack)->ss_flags) ||
__put_user(uoss.ss_size,
&((stack_32_t *)(long)oldstack)->ss_size)))
return -EFAULT;
return ret;
}
/*
* Start of do_signal32 routine
*
* This routine gets control when a pending signal needs to be processed
* in the 32 bit target thread -
*
* It handles both rt and non-rt signals
*/
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
int do_signal32(sigset_t *oldset, struct pt_regs *regs)
{
siginfo_t info;
struct k_sigaction *ka;
unsigned int frame, newsp;
int signr;
if (!oldset)
oldset = ¤t->blocked;
newsp = frame = 0;
signr = get_signal_to_deliver(&info, regs, NULL);
if (signr > 0) {
ka = ¤t->sighand->action[signr-1];
if ((ka->sa.sa_flags & SA_ONSTACK)
&& (!on_sig_stack(regs->gpr[1])))
newsp = (current->sas_ss_sp + current->sas_ss_size);
else
newsp = regs->gpr[1];
newsp = frame = newsp - sizeof(struct sigregs32);
/* Whee! Actually deliver the signal. */
handle_signal32(signr, &info, oldset, regs, &newsp, frame);
}
if (regs->trap == 0x0C00) { /* System Call! */
if ((int)regs->result == -ERESTARTNOHAND ||
(int)regs->result == -ERESTARTSYS ||
(int)regs->result == -ERESTARTNOINTR) {
regs->gpr[3] = regs->orig_gpr3;
regs->nip -= 4; /* Back up & retry system call */
regs->result = 0;
} else if ((int)regs->result == -ERESTART_RESTARTBLOCK) {
regs->gpr[0] = __NR_restart_syscall;
regs->nip -= 4;
regs->result = 0;
}
}
if (newsp == frame)
return 0; /* no signals delivered */
/* Invoke correct stack setup routine */
if (ka->sa.sa_flags & SA_SIGINFO)
setup_rt_frame32(regs, (struct sigregs32*)(u64)frame, newsp);
else
setup_frame32(regs, (struct sigregs32*)(u64)frame, newsp);
return 1;
}
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