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