11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * Copyright (C) 2003 Broadcom Corporation
41da177e4SLinus Torvalds */
502416dcfSRalf Baechle #include <linux/cache.h>
602416dcfSRalf Baechle #include <linux/sched.h>
71da177e4SLinus Torvalds #include <linux/mm.h>
81da177e4SLinus Torvalds #include <linux/smp.h>
91da177e4SLinus Torvalds #include <linux/kernel.h>
101da177e4SLinus Torvalds #include <linux/signal.h>
111da177e4SLinus Torvalds #include <linux/errno.h>
121da177e4SLinus Torvalds #include <linux/wait.h>
131da177e4SLinus Torvalds #include <linux/ptrace.h>
141da177e4SLinus Torvalds #include <linux/unistd.h>
151da177e4SLinus Torvalds #include <linux/compat.h>
161da177e4SLinus Torvalds #include <linux/bitops.h>
171da177e4SLinus Torvalds
18151fd6acSRalf Baechle #include <asm/abi.h>
191da177e4SLinus Torvalds #include <asm/asm.h>
201da177e4SLinus Torvalds #include <asm/cacheflush.h>
21431dc804SRalf Baechle #include <asm/compat-signal.h>
221da177e4SLinus Torvalds #include <asm/sim.h>
237c0f6ba6SLinus Torvalds #include <linux/uaccess.h>
241da177e4SLinus Torvalds #include <asm/ucontext.h>
251da177e4SLinus Torvalds #include <asm/fpu.h>
261da177e4SLinus Torvalds #include <asm/cpu-features.h>
27*be018aaaSArnd Bergmann #include <asm/syscalls.h>
281da177e4SLinus Torvalds
291da177e4SLinus Torvalds #include "signal-common.h"
301da177e4SLinus Torvalds
311da177e4SLinus Torvalds /*
321da177e4SLinus Torvalds * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
331da177e4SLinus Torvalds */
341da177e4SLinus Torvalds #define __NR_N32_restart_syscall 6214
351da177e4SLinus Torvalds
361da177e4SLinus Torvalds struct ucontextn32 {
371da177e4SLinus Torvalds u32 uc_flags;
381da177e4SLinus Torvalds s32 uc_link;
39ea536ad4SAl Viro compat_stack_t uc_stack;
401da177e4SLinus Torvalds struct sigcontext uc_mcontext;
41431dc804SRalf Baechle compat_sigset_t uc_sigmask; /* mask last for extensibility */
421da177e4SLinus Torvalds };
431da177e4SLinus Torvalds
441da177e4SLinus Torvalds struct rt_sigframe_n32 {
451da177e4SLinus Torvalds u32 rs_ass[4]; /* argument save space for o32 */
46d814c28cSDavid Daney u32 rs_pad[2]; /* Was: signal trampoline */
47a76f3a41SPavel Kiryukhin struct compat_siginfo rs_info;
481da177e4SLinus Torvalds struct ucontextn32 rs_uc;
491da177e4SLinus Torvalds };
501da177e4SLinus Torvalds
sysn32_rt_sigreturn(void)5196a68b14SPaul Burton asmlinkage void sysn32_rt_sigreturn(void)
521da177e4SLinus Torvalds {
539bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame;
5496a68b14SPaul Burton struct pt_regs *regs;
551da177e4SLinus Torvalds sigset_t set;
56c6a2f467SAtsushi Nemoto int sig;
571da177e4SLinus Torvalds
5896a68b14SPaul Burton regs = current_pt_regs();
5996a68b14SPaul Burton frame = (struct rt_sigframe_n32 __user *)regs->regs[29];
6096d4f267SLinus Torvalds if (!access_ok(frame, sizeof(*frame)))
611da177e4SLinus Torvalds goto badframe;
62431dc804SRalf Baechle if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
631da177e4SLinus Torvalds goto badframe;
641da177e4SLinus Torvalds
658598f3cdSMatt Fleming set_current_blocked(&set);
661da177e4SLinus Torvalds
6796a68b14SPaul Burton sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
68c6a2f467SAtsushi Nemoto if (sig < 0)
691da177e4SLinus Torvalds goto badframe;
70c6a2f467SAtsushi Nemoto else if (sig)
713cf5d076SEric W. Biederman force_sig(sig);
721da177e4SLinus Torvalds
73ea536ad4SAl Viro if (compat_restore_altstack(&frame->rs_uc.uc_stack))
741da177e4SLinus Torvalds goto badframe;
751da177e4SLinus Torvalds
761da177e4SLinus Torvalds /*
771da177e4SLinus Torvalds * Don't let your children do this ...
781da177e4SLinus Torvalds */
791da177e4SLinus Torvalds __asm__ __volatile__(
801da177e4SLinus Torvalds "move\t$29, %0\n\t"
811da177e4SLinus Torvalds "j\tsyscall_exit"
821da177e4SLinus Torvalds : /* no outputs */
8396a68b14SPaul Burton : "r" (regs));
841da177e4SLinus Torvalds /* Unreached */
851da177e4SLinus Torvalds
861da177e4SLinus Torvalds badframe:
873cf5d076SEric W. Biederman force_sig(SIGSEGV);
881da177e4SLinus Torvalds }
891da177e4SLinus Torvalds
setup_rt_frame_n32(void * sig_return,struct ksignal * ksig,struct pt_regs * regs,sigset_t * set)9081d103bfSRichard Weinberger static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
9181d103bfSRichard Weinberger struct pt_regs *regs, sigset_t *set)
921da177e4SLinus Torvalds {
939bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame;
941da177e4SLinus Torvalds int err = 0;
951da177e4SLinus Torvalds
967c4f5635SRichard Weinberger frame = get_sigframe(ksig, regs, sizeof(*frame));
9796d4f267SLinus Torvalds if (!access_ok(frame, sizeof (*frame)))
9881d103bfSRichard Weinberger return -EFAULT;
991da177e4SLinus Torvalds
1001da177e4SLinus Torvalds /* Create siginfo. */
10181d103bfSRichard Weinberger err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
1021da177e4SLinus Torvalds
1031da177e4SLinus Torvalds /* Create the ucontext. */
1041da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_flags);
1051da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_link);
106ea536ad4SAl Viro err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
1071da177e4SLinus Torvalds err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
108431dc804SRalf Baechle err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
1091da177e4SLinus Torvalds
1101da177e4SLinus Torvalds if (err)
11181d103bfSRichard Weinberger return -EFAULT;
1121da177e4SLinus Torvalds
1131da177e4SLinus Torvalds /*
1141da177e4SLinus Torvalds * Arguments to signal handler:
1151da177e4SLinus Torvalds *
1161da177e4SLinus Torvalds * a0 = signal number
1171da177e4SLinus Torvalds * a1 = 0 (should be cause)
1181da177e4SLinus Torvalds * a2 = pointer to ucontext
1191da177e4SLinus Torvalds *
1201da177e4SLinus Torvalds * $25 and c0_epc point to the signal handler, $29 points to
1211da177e4SLinus Torvalds * the struct rt_sigframe.
1221da177e4SLinus Torvalds */
12381d103bfSRichard Weinberger regs->regs[ 4] = ksig->sig;
1241da177e4SLinus Torvalds regs->regs[ 5] = (unsigned long) &frame->rs_info;
1251da177e4SLinus Torvalds regs->regs[ 6] = (unsigned long) &frame->rs_uc;
1261da177e4SLinus Torvalds regs->regs[29] = (unsigned long) frame;
127d814c28cSDavid Daney regs->regs[31] = (unsigned long) sig_return;
12881d103bfSRichard Weinberger regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
1291da177e4SLinus Torvalds
130722bb63dSFranck Bui-Huu DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
1311da177e4SLinus Torvalds current->comm, current->pid,
1321da177e4SLinus Torvalds frame, regs->cp0_epc, regs->regs[31]);
133722bb63dSFranck Bui-Huu
1347b3e2fc8SRalf Baechle return 0;
1351da177e4SLinus Torvalds }
136151fd6acSRalf Baechle
137151fd6acSRalf Baechle struct mips_abi mips_abi_n32 = {
138151fd6acSRalf Baechle .setup_rt_frame = setup_rt_frame_n32,
13977856100SPaul Burton .restart = __NR_N32_restart_syscall,
14077856100SPaul Burton
14177856100SPaul Burton .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
14277856100SPaul Burton .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
14377856100SPaul Burton .off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
144ebb5e78cSAlex Smith
145ebb5e78cSAlex Smith .vdso = &vdso_image_n32,
146151fd6acSRalf Baechle };
147