// SPDX-License-Identifier: GPL-2.0
/*
- * linux/arch/parisc/kernel/signal.c: Architecture-specific signal
- * handling support.
+ * PA-RISC architecture-specific signal handling support.
*
* Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
* Copyright (C) 2000 Linuxcare, Inc.
+ * Copyright (C) 2000-2022 Helge Deller <deller@gmx.de>
+ * Copyright (C) 2022 John David Anglin <dave.anglin@bell.net>
*
* Based on the ia64, i386, and alpha versions.
- *
- * Like the IA-64, we are a recent enough port (we are *starting*
- * with glibc2.2) that we do not need to support the old non-realtime
- * Linux signals. Therefore we don't.
*/
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/asm-offsets.h>
+#include <asm/vdso.h>
#ifdef CONFIG_COMPAT
#include "signal32.h"
* Do a signal return - restore sigcontext.
*/
-/* Trampoline for calling rt_sigreturn() */
-#define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */
-#define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */
-#define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */
-#define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */
-/* For debugging */
-#define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */
-
static long
restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
{
err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq));
err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq));
err |= __get_user(regs->sar, &sc->sc_sar);
- DBG(2,"restore_sigcontext: iaoq is %#lx / %#lx\n",
- regs->iaoq[0],regs->iaoq[1]);
- DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]);
+ DBG(2, "%s: iaoq is %#lx / %#lx\n",
+ __func__, regs->iaoq[0], regs->iaoq[1]);
+ DBG(2, "%s: r28 is %ld\n", __func__, regs->gr[28]);
return err;
}
/* Unwind the user stack to get the rt_sigframe structure. */
frame = (struct rt_sigframe __user *)
(usp - sigframe_size);
- DBG(2,"sys_rt_sigreturn: frame is %p\n", frame);
+ DBG(2, "%s: frame is %p pid %d\n", __func__, frame, task_pid_nr(current));
regs->orig_r28 = 1; /* no restarts for sigreturn */
compat_frame = (struct compat_rt_sigframe __user *)frame;
if (is_compat_task()) {
- DBG(2,"sys_rt_sigreturn: ELF32 process.\n");
if (get_compat_sigset(&set, &compat_frame->uc.uc_sigmask))
goto give_sigsegv;
} else
/* Good thing we saved the old gr[30], eh? */
#ifdef CONFIG_64BIT
if (is_compat_task()) {
- DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n",
- &compat_frame->uc.uc_mcontext);
+ DBG(1, "%s: compat_frame->uc.uc_mcontext 0x%p\n",
+ __func__, &compat_frame->uc.uc_mcontext);
// FIXME: Load upper half from register file
if (restore_sigcontext32(&compat_frame->uc.uc_mcontext,
&compat_frame->regs, regs))
goto give_sigsegv;
- DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
- usp, &compat_frame->uc.uc_stack);
+ DBG(1, "%s: usp %#08lx stack 0x%p\n",
+ __func__, usp, &compat_frame->uc.uc_stack);
if (compat_restore_altstack(&compat_frame->uc.uc_stack))
goto give_sigsegv;
} else
#endif
{
- DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n",
- &frame->uc.uc_mcontext);
+ DBG(1, "%s: frame->uc.uc_mcontext 0x%p\n",
+ __func__, &frame->uc.uc_mcontext);
if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
goto give_sigsegv;
- DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
- usp, &frame->uc.uc_stack);
+ DBG(1, "%s: usp %#08lx stack 0x%p\n",
+ __func__, usp, &frame->uc.uc_stack);
if (restore_altstack(&frame->uc.uc_stack))
goto give_sigsegv;
}
*/
if (in_syscall)
regs->gr[31] = regs->iaoq[0];
-#if DEBUG_SIG
- DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]);
- show_regs(regs);
-#endif
+
return;
give_sigsegv:
- DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n");
+ DBG(1, "%s: Sending SIGSEGV\n", __func__);
force_sig(SIGSEGV);
return;
}
/*FIXME: ELF32 vs. ELF64 has different frame_size, but since we
don't use the parameter it doesn't matter */
- DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n",
- (unsigned long)ka, sp, frame_size);
+ DBG(1, "%s: ka = %#lx, sp = %#lx, frame_size = %zu\n",
+ __func__, (unsigned long)ka, sp, frame_size);
/* Align alternate stack and reserve 64 bytes for the signal
handler's frame marker. */
if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */
- DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp);
+ DBG(1, "%s: Returning sp = %#lx\n", __func__, (unsigned long)sp);
return (void __user *) sp; /* Stacks grow up. Fun. */
}
err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]);
err |= __put_user(regs->sr[3], &sc->sc_iasq[0]);
err |= __put_user(regs->sr[3], &sc->sc_iasq[1]);
- DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n",
- regs->gr[31], regs->gr[31]+4);
+ DBG(1, "%s: iaoq %#lx / %#lx (in syscall)\n",
+ __func__, regs->gr[31], regs->gr[31]+4);
} else {
err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq));
err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq));
- DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n",
- regs->iaoq[0], regs->iaoq[1]);
+ DBG(1, "%s: iaoq %#lx / %#lx (not in syscall)\n",
+ __func__, regs->iaoq[0], regs->iaoq[1]);
}
err |= __put_user(flags, &sc->sc_flags);
err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr));
err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
err |= __put_user(regs->sar, &sc->sc_sar);
- DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]);
+ DBG(1, "%s: r28 is %ld\n", __func__, regs->gr[28]);
return err;
}
struct rt_sigframe __user *frame;
unsigned long rp, usp;
unsigned long haddr, sigframe_size;
- unsigned long start, end;
+ unsigned long start;
int err = 0;
#ifdef CONFIG_64BIT
struct compat_rt_sigframe __user * compat_frame;
#endif
frame = get_sigframe(&ksig->ka, usp, sigframe_size);
- DBG(1,"SETUP_RT_FRAME: START\n");
- DBG(1,"setup_rt_frame: frame %p info %p\n", frame, ksig->info);
+ DBG(1, "%s: frame %p info %p\n", __func__, frame, &ksig->info);
start = (unsigned long) frame;
- if (start >= user_addr_max() - sigframe_size)
+ if (start >= TASK_SIZE_MAX - sigframe_size)
return -EFAULT;
#ifdef CONFIG_64BIT
compat_frame = (struct compat_rt_sigframe __user *)frame;
if (is_compat_task()) {
- DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
+ DBG(1, "%s: frame->info = 0x%p\n", __func__, &compat_frame->info);
err |= copy_siginfo_to_user32(&compat_frame->info, &ksig->info);
err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]);
- DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc);
- DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext);
+ DBG(1, "%s: frame->uc = 0x%p\n", __func__, &compat_frame->uc);
+ DBG(1, "%s: frame->uc.uc_mcontext = 0x%p\n",
+ __func__, &compat_frame->uc.uc_mcontext);
err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
&compat_frame->regs, regs, in_syscall);
err |= put_compat_sigset(&compat_frame->uc.uc_sigmask, set,
} else
#endif
{
- DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info);
+ DBG(1, "%s: frame->info = 0x%p\n", __func__, &frame->info);
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]);
- DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc);
- DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext);
+ DBG(1, "%s: frame->uc = 0x%p\n", __func__, &frame->uc);
+ DBG(1, "%s: frame->uc.uc_mcontext = 0x%p\n",
+ __func__, &frame->uc.uc_mcontext);
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
/* FIXME: Should probably be converted as well for the compat case */
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
return -EFAULT;
- /* Set up to return from userspace. If provided, use a stub
- already in userspace. The first words of tramp are used to
- save the previous sigrestartblock trampoline that might be
- on the stack. We start the sigreturn trampoline at
- SIGRESTARTBLOCK_TRAMP+X. */
- err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0,
- &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]);
- err |= __put_user(INSN_LDI_R20,
- &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]);
- err |= __put_user(INSN_BLE_SR2_R0,
- &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]);
- err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]);
-
- start = (unsigned long) &frame->tramp[0];
- end = (unsigned long) &frame->tramp[TRAMP_SIZE];
- flush_user_dcache_range_asm(start, end);
- flush_user_icache_range_asm(start, end);
-
- /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP
- * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP
- * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP
- */
- rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP];
+#ifdef CONFIG_64BIT
+ if (!is_compat_task())
+ rp = VDSO64_SYMBOL(current, sigtramp_rt);
+ else
+#endif
+ rp = VDSO32_SYMBOL(current, sigtramp_rt);
- if (err)
- return -EFAULT;
+ if (in_syscall)
+ rp += 4*4; /* skip 4 instructions and start at ldi 1,%r25 */
haddr = A(ksig->ka.sa.sa_handler);
/* The sa_handler may be a pointer to a function descriptor */
haddr = fdesc.addr;
regs->gr[19] = fdesc.gp;
- DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
- haddr, regs->gr[19], in_syscall);
+ DBG(1, "%s: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
+ __func__, haddr, regs->gr[19], in_syscall);
}
#endif
regs->gr[31] = haddr;
#ifdef CONFIG_64BIT
if (!test_thread_flag(TIF_32BIT))
- sigframe_size |= 1;
+ sigframe_size |= 1; /* XXX ???? */
#endif
} else {
unsigned long psw = USER_PSW;
}
regs->gr[0] = psw;
- regs->iaoq[0] = haddr | 3;
+ regs->iaoq[0] = haddr | PRIV_USER;
regs->iaoq[1] = regs->iaoq[0] + 4;
}
- regs->gr[2] = rp; /* userland return pointer */
+ regs->gr[2] = rp; /* userland return pointer */
regs->gr[26] = ksig->sig; /* signal number */
#ifdef CONFIG_64BIT
regs->gr[24] = A(&frame->uc); /* ucontext pointer */
}
- DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n",
+ DBG(1, "%s: making sigreturn frame: %#lx + %#lx = %#lx\n", __func__,
regs->gr[30], sigframe_size,
regs->gr[30] + sigframe_size);
/* Raise the user stack pointer to make a proper call frame. */
regs->gr[30] = (A(frame) + sigframe_size);
- DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
- current->comm, current->pid, frame, regs->gr[30],
+ DBG(1, "%s: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
+ __func__, current->comm, current->pid, frame, regs->gr[30],
regs->iaoq[0], regs->iaoq[1], rp);
return 0;
int ret;
sigset_t *oldset = sigmask_to_save();
- DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n",
- ksig->sig, ksig->ka, ksig->info, oldset, regs);
+ DBG(1, "%s: sig=%d, ka=%p, info=%p, oldset=%p, regs=%p\n",
+ __func__, ksig->sig, &ksig->ka, &ksig->info, oldset, regs);
/* Set up the stack frame */
ret = setup_rt_frame(ksig, oldset, regs, in_syscall);
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP) ||
test_thread_flag(TIF_BLOCKSTEP));
- DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
- regs->gr[28]);
+ DBG(1, "%s: Exit (success), regs->gr[28] = %ld\n",
+ __func__, regs->gr[28]);
}
/*
if (regs->orig_r28)
return;
regs->orig_r28 = 1; /* no more restarts */
+
+ DBG(1, "%s: orig_r28 = %ld pid %d r20 %ld\n",
+ __func__, regs->orig_r28, task_pid_nr(current), regs->gr[20]);
+
/* Check the return code */
switch (regs->gr[28]) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
- DBG(1,"ERESTARTNOHAND: returning -EINTR\n");
+ DBG(1, "%s: ERESTARTNOHAND: returning -EINTR\n", __func__);
regs->gr[28] = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
- DBG(1,"ERESTARTSYS: putting -EINTR\n");
+ DBG(1, "%s: ERESTARTSYS: putting -EINTR pid %d\n",
+ __func__, task_pid_nr(current));
regs->gr[28] = -EINTR;
break;
}
fallthrough;
case -ERESTARTNOINTR:
+ DBG(1, "%s: %ld\n", __func__, regs->gr[28]);
check_syscallno_in_delay_branch(regs);
break;
}
if (regs->orig_r28)
return;
regs->orig_r28 = 1; /* no more restarts */
- switch(regs->gr[28]) {
+
+ DBG(2, "%s: gr28 = %ld pid %d\n",
+ __func__, regs->gr[28], task_pid_nr(current));
+
+ switch (regs->gr[28]) {
case -ERESTART_RESTARTBLOCK: {
/* Restart the system call - no handlers present */
unsigned int *usp = (unsigned int *)regs->gr[30];
- unsigned long start = (unsigned long) &usp[2];
- unsigned long end = (unsigned long) &usp[5];
+ unsigned long rp;
long err = 0;
/* check that we don't exceed the stack */
- if (A(&usp[0]) >= user_addr_max() - 5 * sizeof(int))
+ if (A(&usp[0]) >= TASK_SIZE_MAX - 5 * sizeof(int))
return;
- /* Setup a trampoline to restart the syscall
- * with __NR_restart_syscall
+ /* Call trampoline in vdso to restart the syscall
+ * with __NR_restart_syscall.
+ * Original return addresses are on stack like this:
*
* 0: <return address (orig r31)>
* 4: <2nd half for 64-bit>
- * 8: ldw 0(%sp), %r31
- * 12: be 0x100(%sr2, %r0)
- * 16: ldi __NR_restart_syscall, %r20
*/
#ifdef CONFIG_64BIT
- err |= put_user(regs->gr[31] >> 32, &usp[0]);
- err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
- err |= put_user(0x0fc010df, &usp[2]);
-#else
- err |= put_user(regs->gr[31], &usp[0]);
- err |= put_user(0x0fc0109f, &usp[2]);
+ if (!is_compat_task()) {
+ err |= put_user(regs->gr[31] >> 32, &usp[0]);
+ err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
+ rp = VDSO64_SYMBOL(current, restart_syscall);
+ } else
#endif
- err |= put_user(0xe0008200, &usp[3]);
- err |= put_user(0x34140000, &usp[4]);
-
+ {
+ err |= put_user(regs->gr[31], &usp[0]);
+ rp = VDSO32_SYMBOL(current, restart_syscall);
+ }
WARN_ON(err);
- /* flush data/instruction cache for new insns */
- flush_user_dcache_range_asm(start, end);
- flush_user_icache_range_asm(start, end);
-
- regs->gr[31] = regs->gr[30] + 8;
+ regs->gr[31] = rp;
+ DBG(1, "%s: ERESTART_RESTARTBLOCK\n", __func__);
return;
}
+ case -EINTR:
+ /* ok, was handled before and should be returned. */
+ break;
case -ERESTARTNOHAND:
case -ERESTARTSYS:
case -ERESTARTNOINTR:
+ DBG(1, "%s: Type %ld\n", __func__, regs->gr[28]);
check_syscallno_in_delay_branch(regs);
return;
default:
* registers). As noted below, the syscall number gets restored for
* us due to the magic of delayed branching.
*/
-asmlinkage void
-do_signal(struct pt_regs *regs, long in_syscall)
+static void do_signal(struct pt_regs *regs, long in_syscall)
{
struct ksignal ksig;
+ int restart_syscall;
+ bool has_handler;
- DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n",
- regs, regs->sr[7], in_syscall);
+ has_handler = get_signal(&ksig);
- if (get_signal(&ksig)) {
- DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]);
+ restart_syscall = 0;
+ if (in_syscall)
+ restart_syscall = 1;
+
+ if (has_handler) {
/* Restart a system call if necessary. */
- if (in_syscall)
+ if (restart_syscall)
syscall_restart(regs, &ksig.ka);
handle_signal(&ksig, regs, in_syscall);
+ DBG(1, "%s: Handled signal pid %d\n",
+ __func__, task_pid_nr(current));
return;
}
- /* Did we come from a system call? */
- if (in_syscall)
+ /* Do we need to restart the system call? */
+ if (restart_syscall)
insert_restart_trampoline(regs);
- DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n",
- regs->gr[28]);
+ DBG(1, "%s: Exit (not delivered), regs->gr[28] = %ld orig_r28 = %ld pid %d\n",
+ __func__, regs->gr[28], regs->orig_r28, task_pid_nr(current));
restore_saved_sigmask();
}
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