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Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2003 Broadcom Corporation | |
1da177e4 | 4 | */ |
02416dcf RB |
5 | #include <linux/cache.h> |
6 | #include <linux/sched.h> | |
1da177e4 LT |
7 | #include <linux/mm.h> |
8 | #include <linux/smp.h> | |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | #include <linux/signal.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/wait.h> | |
13 | #include <linux/ptrace.h> | |
14 | #include <linux/unistd.h> | |
15 | #include <linux/compat.h> | |
16 | #include <linux/bitops.h> | |
17 | ||
151fd6ac | 18 | #include <asm/abi.h> |
1da177e4 LT |
19 | #include <asm/asm.h> |
20 | #include <asm/cacheflush.h> | |
431dc804 | 21 | #include <asm/compat-signal.h> |
1da177e4 | 22 | #include <asm/sim.h> |
7c0f6ba6 | 23 | #include <linux/uaccess.h> |
1da177e4 | 24 | #include <asm/ucontext.h> |
1da177e4 LT |
25 | #include <asm/fpu.h> |
26 | #include <asm/cpu-features.h> | |
02416dcf | 27 | #include <asm/war.h> |
1da177e4 LT |
28 | |
29 | #include "signal-common.h" | |
30 | ||
31 | /* | |
32 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
33 | */ | |
1da177e4 LT |
34 | #define __NR_N32_restart_syscall 6214 |
35 | ||
205d84aa RB |
36 | extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); |
37 | extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); | |
38 | ||
1da177e4 | 39 | struct ucontextn32 { |
70342287 RB |
40 | u32 uc_flags; |
41 | s32 uc_link; | |
ea536ad4 | 42 | compat_stack_t uc_stack; |
1da177e4 | 43 | struct sigcontext uc_mcontext; |
70342287 | 44 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ |
1da177e4 LT |
45 | }; |
46 | ||
c0b9bae9 FBH |
47 | struct rt_sigframe_n32 { |
48 | u32 rs_ass[4]; /* argument save space for o32 */ | |
d814c28c | 49 | u32 rs_pad[2]; /* Was: signal trampoline */ |
a76f3a41 | 50 | struct compat_siginfo rs_info; |
c0b9bae9 | 51 | struct ucontextn32 rs_uc; |
1da177e4 LT |
52 | }; |
53 | ||
96a68b14 | 54 | asmlinkage void sysn32_rt_sigreturn(void) |
1da177e4 | 55 | { |
9bbf28a3 | 56 | struct rt_sigframe_n32 __user *frame; |
96a68b14 | 57 | struct pt_regs *regs; |
1da177e4 | 58 | sigset_t set; |
c6a2f467 | 59 | int sig; |
1da177e4 | 60 | |
96a68b14 PB |
61 | regs = current_pt_regs(); |
62 | frame = (struct rt_sigframe_n32 __user *)regs->regs[29]; | |
96d4f267 | 63 | if (!access_ok(frame, sizeof(*frame))) |
1da177e4 | 64 | goto badframe; |
431dc804 | 65 | if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) |
1da177e4 LT |
66 | goto badframe; |
67 | ||
8598f3cd | 68 | set_current_blocked(&set); |
1da177e4 | 69 | |
96a68b14 | 70 | sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
c6a2f467 | 71 | if (sig < 0) |
1da177e4 | 72 | goto badframe; |
c6a2f467 AN |
73 | else if (sig) |
74 | force_sig(sig, current); | |
1da177e4 | 75 | |
ea536ad4 | 76 | if (compat_restore_altstack(&frame->rs_uc.uc_stack)) |
1da177e4 | 77 | goto badframe; |
1da177e4 LT |
78 | |
79 | /* | |
80 | * Don't let your children do this ... | |
81 | */ | |
82 | __asm__ __volatile__( | |
83 | "move\t$29, %0\n\t" | |
84 | "j\tsyscall_exit" | |
96a68b14 PB |
85 | : /* no outputs */ |
86 | : "r" (regs)); | |
1da177e4 LT |
87 | /* Unreached */ |
88 | ||
89 | badframe: | |
90 | force_sig(SIGSEGV, current); | |
91 | } | |
92 | ||
81d103bf RW |
93 | static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig, |
94 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 95 | { |
9bbf28a3 | 96 | struct rt_sigframe_n32 __user *frame; |
1da177e4 | 97 | int err = 0; |
1da177e4 | 98 | |
7c4f5635 | 99 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
96d4f267 | 100 | if (!access_ok(frame, sizeof (*frame))) |
81d103bf | 101 | return -EFAULT; |
1da177e4 | 102 | |
1da177e4 | 103 | /* Create siginfo. */ |
81d103bf | 104 | err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info); |
1da177e4 | 105 | |
70342287 | 106 | /* Create the ucontext. */ |
1da177e4 LT |
107 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
108 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
ea536ad4 | 109 | err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 | 110 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
431dc804 | 111 | err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); |
1da177e4 LT |
112 | |
113 | if (err) | |
81d103bf | 114 | return -EFAULT; |
1da177e4 LT |
115 | |
116 | /* | |
117 | * Arguments to signal handler: | |
118 | * | |
119 | * a0 = signal number | |
120 | * a1 = 0 (should be cause) | |
121 | * a2 = pointer to ucontext | |
122 | * | |
123 | * $25 and c0_epc point to the signal handler, $29 points to | |
124 | * the struct rt_sigframe. | |
125 | */ | |
81d103bf | 126 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
127 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
128 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
129 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 130 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 131 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 132 | |
722bb63d | 133 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
134 | current->comm, current->pid, |
135 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 136 | |
7b3e2fc8 | 137 | return 0; |
1da177e4 | 138 | } |
151fd6ac RB |
139 | |
140 | struct mips_abi mips_abi_n32 = { | |
70342287 | 141 | .setup_rt_frame = setup_rt_frame_n32, |
77856100 PB |
142 | .restart = __NR_N32_restart_syscall, |
143 | ||
144 | .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), | |
145 | .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), | |
146 | .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), | |
ebb5e78c AS |
147 | |
148 | .vdso = &vdso_image_n32, | |
151fd6ac | 149 | }; |