^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/alpha/kernel/signal.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1995 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * 1997-11-02 Modified for POSIX.1b signals by Richard Henderson
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/sigcontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include "proto.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define DEBUG_SIG 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) asmlinkage void ret_from_sys_call(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * The OSF/1 sigprocmask calling sequence is different from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * C sigprocmask() sequence..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) SYSCALL_DEFINE2(osf_sigprocmask, int, how, unsigned long, newmask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) sigset_t oldmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) sigset_t mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned long res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) siginitset(&mask, newmask & _BLOCKABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) res = sigprocmask(how, &mask, &oldmask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (!res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) force_successful_syscall_return();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) res = oldmask.sig[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) SYSCALL_DEFINE3(osf_sigaction, int, sig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) const struct osf_sigaction __user *, act,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct osf_sigaction __user *, oact)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct k_sigaction new_ka, old_ka;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (act) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) old_sigset_t mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (!access_ok(act, sizeof(*act)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) __get_user(mask, &act->sa_mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) siginitset(&new_ka.sa.sa_mask, mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) new_ka.ka_restorer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (!ret && oact) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (!access_ok(oact, sizeof(*oact)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct sigaction __user *, oact,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) size_t, sigsetsize, void __user *, restorer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct k_sigaction new_ka, old_ka;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* XXX: Don't preclude handling different sized sigset_t's. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (sigsetsize != sizeof(sigset_t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (act) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) new_ka.ka_restorer = restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (!ret && oact) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * Do a signal return; undo the signal stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #if _NSIG_WORDS > 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) # error "Non SA_SIGINFO frame needs rearranging"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct sigframe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct sigcontext sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) unsigned int retcode[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct rt_sigframe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct siginfo info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) struct ucontext uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) unsigned int retcode[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* If this changes, userland unwinders that Know Things about our signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) frame will break. Do not undertake lightly. It also implies an ABI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) change wrt the size of siginfo_t, which may cause some pain. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) extern char compile_time_assert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) [offsetof(struct rt_sigframe, uc.uc_mcontext) == 176 ? 1 : -1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #define INSN_MOV_R30_R16 0x47fe0410
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #define INSN_LDI_R0 0x201f0000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #define INSN_CALLSYS 0x00000083
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) unsigned long usp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct switch_stack *sw = (struct switch_stack *)regs - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) long i, err = __get_user(regs->pc, &sc->sc_pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) sw->r26 = (unsigned long) ret_from_sys_call;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) err |= __get_user(regs->r0, sc->sc_regs+0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) err |= __get_user(regs->r1, sc->sc_regs+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) err |= __get_user(regs->r2, sc->sc_regs+2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) err |= __get_user(regs->r3, sc->sc_regs+3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) err |= __get_user(regs->r4, sc->sc_regs+4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) err |= __get_user(regs->r5, sc->sc_regs+5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) err |= __get_user(regs->r6, sc->sc_regs+6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) err |= __get_user(regs->r7, sc->sc_regs+7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) err |= __get_user(regs->r8, sc->sc_regs+8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) err |= __get_user(sw->r9, sc->sc_regs+9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) err |= __get_user(sw->r10, sc->sc_regs+10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) err |= __get_user(sw->r11, sc->sc_regs+11);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) err |= __get_user(sw->r12, sc->sc_regs+12);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) err |= __get_user(sw->r13, sc->sc_regs+13);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) err |= __get_user(sw->r14, sc->sc_regs+14);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) err |= __get_user(sw->r15, sc->sc_regs+15);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) err |= __get_user(regs->r16, sc->sc_regs+16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) err |= __get_user(regs->r17, sc->sc_regs+17);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) err |= __get_user(regs->r18, sc->sc_regs+18);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) err |= __get_user(regs->r19, sc->sc_regs+19);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) err |= __get_user(regs->r20, sc->sc_regs+20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) err |= __get_user(regs->r21, sc->sc_regs+21);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) err |= __get_user(regs->r22, sc->sc_regs+22);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) err |= __get_user(regs->r23, sc->sc_regs+23);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) err |= __get_user(regs->r24, sc->sc_regs+24);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) err |= __get_user(regs->r25, sc->sc_regs+25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) err |= __get_user(regs->r26, sc->sc_regs+26);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) err |= __get_user(regs->r27, sc->sc_regs+27);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) err |= __get_user(regs->r28, sc->sc_regs+28);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) err |= __get_user(regs->gp, sc->sc_regs+29);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) err |= __get_user(usp, sc->sc_regs+30);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) wrusp(usp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) for (i = 0; i < 31; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) err |= __get_user(sw->fp[i], sc->sc_fpregs+i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) err |= __get_user(sw->fp[31], &sc->sc_fpcr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /* Note that this syscall is also used by setcontext(3) to install
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) a given sigcontext. This because it's impossible to set *all*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) registers and transfer control from userland. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) asmlinkage void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) do_sigreturn(struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) /* Verify that it's a good sigcontext before using it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (!access_ok(sc, sizeof(*sc)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) goto give_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (__get_user(set.sig[0], &sc->sc_mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) goto give_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (restore_sigcontext(sc, regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) goto give_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* Send SIGTRAP if we're single-stepping: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (ptrace_cancel_bpt (current)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) give_sigsegv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) asmlinkage void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) do_rt_sigreturn(struct rt_sigframe __user *frame)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* Verify that it's a good ucontext_t before using it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (!access_ok(&frame->uc, sizeof(frame->uc)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) goto give_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) goto give_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) goto give_sigsegv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /* Send SIGTRAP if we're single-stepping: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (ptrace_cancel_bpt (current)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) give_sigsegv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * Set up a signal frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static inline void __user *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) get_sigframe(struct ksignal *ksig, unsigned long sp, size_t frame_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return (void __user *)((sigsp(sp, ksig) - frame_size) & -32ul);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) unsigned long mask, unsigned long sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) struct switch_stack *sw = (struct switch_stack *)regs - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) long i, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) err |= __put_user(on_sig_stack((unsigned long)sc), &sc->sc_onstack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) err |= __put_user(mask, &sc->sc_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) err |= __put_user(regs->pc, &sc->sc_pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) err |= __put_user(8, &sc->sc_ps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) err |= __put_user(regs->r0 , sc->sc_regs+0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) err |= __put_user(regs->r1 , sc->sc_regs+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) err |= __put_user(regs->r2 , sc->sc_regs+2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) err |= __put_user(regs->r3 , sc->sc_regs+3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) err |= __put_user(regs->r4 , sc->sc_regs+4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) err |= __put_user(regs->r5 , sc->sc_regs+5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) err |= __put_user(regs->r6 , sc->sc_regs+6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) err |= __put_user(regs->r7 , sc->sc_regs+7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) err |= __put_user(regs->r8 , sc->sc_regs+8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) err |= __put_user(sw->r9 , sc->sc_regs+9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) err |= __put_user(sw->r10 , sc->sc_regs+10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) err |= __put_user(sw->r11 , sc->sc_regs+11);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) err |= __put_user(sw->r12 , sc->sc_regs+12);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) err |= __put_user(sw->r13 , sc->sc_regs+13);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) err |= __put_user(sw->r14 , sc->sc_regs+14);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) err |= __put_user(sw->r15 , sc->sc_regs+15);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) err |= __put_user(regs->r16, sc->sc_regs+16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) err |= __put_user(regs->r17, sc->sc_regs+17);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) err |= __put_user(regs->r18, sc->sc_regs+18);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) err |= __put_user(regs->r19, sc->sc_regs+19);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) err |= __put_user(regs->r20, sc->sc_regs+20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) err |= __put_user(regs->r21, sc->sc_regs+21);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) err |= __put_user(regs->r22, sc->sc_regs+22);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) err |= __put_user(regs->r23, sc->sc_regs+23);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) err |= __put_user(regs->r24, sc->sc_regs+24);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) err |= __put_user(regs->r25, sc->sc_regs+25);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) err |= __put_user(regs->r26, sc->sc_regs+26);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) err |= __put_user(regs->r27, sc->sc_regs+27);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) err |= __put_user(regs->r28, sc->sc_regs+28);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) err |= __put_user(regs->gp , sc->sc_regs+29);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) err |= __put_user(sp, sc->sc_regs+30);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) err |= __put_user(0, sc->sc_regs+31);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) for (i = 0; i < 31; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) err |= __put_user(sw->fp[i], sc->sc_fpregs+i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) err |= __put_user(0, sc->sc_fpregs+31);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) err |= __put_user(sw->fp[31], &sc->sc_fpcr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) err |= __put_user(regs->trap_a0, &sc->sc_traparg_a0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) err |= __put_user(regs->trap_a1, &sc->sc_traparg_a1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) err |= __put_user(regs->trap_a2, &sc->sc_traparg_a2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) unsigned long oldsp, r26, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) oldsp = rdusp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) frame = get_sigframe(ksig, oldsp, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) err |= setup_sigcontext(&frame->sc, regs, set->sig[0], oldsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /* Set up to return from userspace. If provided, use a stub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) already in userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) r26 = (unsigned long) ksig->ka.ka_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (!r26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) err |= __put_user(INSN_LDI_R0+__NR_sigreturn, frame->retcode+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) err |= __put_user(INSN_CALLSYS, frame->retcode+2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) imb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) r26 = (unsigned long) frame->retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) /* Check that everything was written properly. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /* "Return" to the handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) regs->r26 = r26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) regs->r27 = regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) regs->r16 = ksig->sig; /* a0: signal number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) regs->r17 = 0; /* a1: exception code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) regs->r18 = (unsigned long) &frame->sc; /* a2: sigcontext pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) wrusp((unsigned long) frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) #if DEBUG_SIG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) current->comm, current->pid, frame, regs->pc, regs->r26);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) unsigned long oldsp, r26, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) oldsp = rdusp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) frame = get_sigframe(ksig, oldsp, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) err |= copy_siginfo_to_user(&frame->info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /* Create the ucontext. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) err |= __put_user(0, &frame->uc.uc_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) err |= __put_user(0, &frame->uc.uc_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) err |= __put_user(set->sig[0], &frame->uc.uc_osf_sigmask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) err |= __save_altstack(&frame->uc.uc_stack, oldsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) err |= setup_sigcontext(&frame->uc.uc_mcontext, regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) set->sig[0], oldsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) /* Set up to return from userspace. If provided, use a stub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) already in userspace. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) r26 = (unsigned long) ksig->ka.ka_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (!r26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) err |= __put_user(INSN_LDI_R0+__NR_rt_sigreturn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) frame->retcode+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) err |= __put_user(INSN_CALLSYS, frame->retcode+2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) imb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) r26 = (unsigned long) frame->retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) /* "Return" to the handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) regs->r26 = r26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) regs->r27 = regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) regs->r16 = ksig->sig; /* a0: signal number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) regs->r17 = (unsigned long) &frame->info; /* a1: siginfo pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) regs->r18 = (unsigned long) &frame->uc; /* a2: ucontext pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) wrusp((unsigned long) frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) #if DEBUG_SIG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) current->comm, current->pid, frame, regs->pc, regs->r26);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * OK, we're invoking a handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) handle_signal(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) sigset_t *oldset = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (ksig->ka.sa.sa_flags & SA_SIGINFO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) ret = setup_rt_frame(ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) ret = setup_frame(ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) signal_setup_done(ret, ksig, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) syscall_restart(unsigned long r0, unsigned long r19,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct pt_regs *regs, struct k_sigaction *ka)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) switch (regs->r0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) case ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (!(ka->sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) case ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) regs->r0 = EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) case ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) regs->r0 = r0; /* reset v0 and a3 and replay syscall */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) regs->r19 = r19;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) case ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) regs->r0 = EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) * Note that 'init' is a special process: it doesn't get signals it doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * want to handle. Thus you cannot kill init even with a SIGKILL even by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) * mistake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) * Note that we go through the signals twice: once to check the signals that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) * the kernel can handle, and then we build all the user-level signal handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) * stack-frames in one go after that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * "r0" and "r19" are the registers we need to restore for system call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * restart. "r0" is also used as an indicator whether we can restart at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * all (if we get here from anything but a syscall return, it will be 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) do_signal(struct pt_regs *regs, unsigned long r0, unsigned long r19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) unsigned long single_stepping = ptrace_cancel_bpt(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) /* This lets the debugger run, ... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) /* ... so re-check the single stepping. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) single_stepping |= ptrace_cancel_bpt(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) /* Whee! Actually deliver the signal. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) if (r0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) syscall_restart(r0, r19, regs, &ksig.ka);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) handle_signal(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) single_stepping |= ptrace_cancel_bpt(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (r0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) switch (regs->r0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) case ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) case ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) case ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) /* Reset v0 and a3 and replay syscall. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) regs->r0 = r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) regs->r19 = r19;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) case ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) /* Set v0 to the restart_syscall and replay */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) regs->r0 = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (single_stepping)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) ptrace_set_bpt(current); /* re-set breakpoint */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) do_work_pending(struct pt_regs *regs, unsigned long thread_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) unsigned long r0, unsigned long r19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (thread_flags & _TIF_NEED_RESCHED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) local_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (thread_flags & _TIF_SIGPENDING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) do_signal(regs, r0, r19);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) r0 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) thread_flags = current_thread_info()->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) } while (thread_flags & _TIF_WORK_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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