Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/parisc/kernel/signal.c: Architecture-specific signal |
| 3 | * handling support. |
| 4 | * |
| 5 | * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> |
| 6 | * Copyright (C) 2000 Linuxcare, Inc. |
| 7 | * |
| 8 | * Based on the ia64, i386, and alpha versions. |
| 9 | * |
| 10 | * Like the IA-64, we are a recent enough port (we are *starting* |
| 11 | * with glibc2.2) that we do not need to support the old non-realtime |
Helge Deller | c78c2b7 | 2015-02-16 22:21:00 +0100 | [diff] [blame] | 12 | * Linux signals. Therefore we don't. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | */ |
| 14 | |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/mm.h> |
| 17 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/signal.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/wait.h> |
| 22 | #include <linux/ptrace.h> |
Kyle McMartin | ecf02de | 2009-04-27 00:29:53 -0400 | [diff] [blame] | 23 | #include <linux/tracehook.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/unistd.h> |
| 25 | #include <linux/stddef.h> |
| 26 | #include <linux/compat.h> |
| 27 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/ucontext.h> |
| 29 | #include <asm/rt_sigframe.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/pgalloc.h> |
| 32 | #include <asm/cacheflush.h> |
Sam Ravnborg | 0013a85 | 2005-09-09 20:57:26 +0200 | [diff] [blame] | 33 | #include <asm/asm-offsets.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #ifdef CONFIG_COMPAT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include "signal32.h" |
| 37 | #endif |
| 38 | |
| 39 | #define DEBUG_SIG 0 |
| 40 | #define DEBUG_SIG_LEVEL 2 |
| 41 | |
| 42 | #if DEBUG_SIG |
| 43 | #define DBG(LEVEL, ...) \ |
| 44 | ((DEBUG_SIG_LEVEL >= LEVEL) \ |
| 45 | ? printk(__VA_ARGS__) : (void) 0) |
| 46 | #else |
| 47 | #define DBG(LEVEL, ...) |
| 48 | #endif |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | /* gcc will complain if a pointer is cast to an integer of different |
| 51 | * size. If you really need to do this (and we do for an ELF32 user |
| 52 | * application in an ELF64 kernel) then you have to do a cast to an |
| 53 | * integer of the same size first. The A() macro accomplishes |
| 54 | * this. */ |
| 55 | #define A(__x) ((unsigned long)(__x)) |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * Do a signal return - restore sigcontext. |
| 59 | */ |
| 60 | |
| 61 | /* Trampoline for calling rt_sigreturn() */ |
| 62 | #define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */ |
| 63 | #define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */ |
| 64 | #define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */ |
| 65 | #define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */ |
| 66 | #define INSN_NOP 0x08000240 /* nop */ |
| 67 | /* For debugging */ |
| 68 | #define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */ |
| 69 | |
| 70 | static long |
| 71 | restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs) |
| 72 | { |
| 73 | long err = 0; |
| 74 | |
| 75 | err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr)); |
| 76 | err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); |
| 77 | err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq)); |
| 78 | err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq)); |
| 79 | err |= __get_user(regs->sar, &sc->sc_sar); |
Joe Perches | 8e33a52 | 2013-07-25 11:53:25 -0700 | [diff] [blame] | 80 | DBG(2,"restore_sigcontext: iaoq is %#lx / %#lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | regs->iaoq[0],regs->iaoq[1]); |
| 82 | DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]); |
| 83 | return err; |
| 84 | } |
| 85 | |
| 86 | void |
| 87 | sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) |
| 88 | { |
| 89 | struct rt_sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | sigset_t set; |
| 91 | unsigned long usp = (regs->gr[30] & ~(0x01UL)); |
| 92 | unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 93 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | compat_sigset_t compat_set; |
| 95 | struct compat_rt_sigframe __user * compat_frame; |
| 96 | |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 97 | if (is_compat_task()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
| 99 | #endif |
| 100 | |
Andy Lutomirski | f56141e | 2015-02-12 15:01:14 -0800 | [diff] [blame] | 101 | current->restart_block.fn = do_no_restart_syscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | /* Unwind the user stack to get the rt_sigframe structure. */ |
| 104 | frame = (struct rt_sigframe __user *) |
| 105 | (usp - sigframe_size); |
| 106 | DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); |
| 107 | |
Al Viro | 00df111 | 2012-05-19 00:29:22 -0400 | [diff] [blame] | 108 | regs->orig_r28 = 1; /* no restarts for sigreturn */ |
| 109 | |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 110 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | compat_frame = (struct compat_rt_sigframe __user *)frame; |
| 112 | |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 113 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | DBG(2,"sys_rt_sigreturn: ELF32 process.\n"); |
| 115 | if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set))) |
| 116 | goto give_sigsegv; |
| 117 | sigset_32to64(&set,&compat_set); |
| 118 | } else |
| 119 | #endif |
| 120 | { |
| 121 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 122 | goto give_sigsegv; |
| 123 | } |
| 124 | |
Matt Fleming | ade7728 | 2012-05-11 10:58:58 +1000 | [diff] [blame] | 125 | set_current_blocked(&set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | /* Good thing we saved the old gr[30], eh? */ |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 128 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 129 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", |
| 131 | &compat_frame->uc.uc_mcontext); |
| 132 | // FIXME: Load upper half from register file |
| 133 | if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, |
| 134 | &compat_frame->regs, regs)) |
| 135 | goto give_sigsegv; |
| 136 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", |
| 137 | usp, &compat_frame->uc.uc_stack); |
Al Viro | 6e26aab | 2012-12-23 03:22:04 -0500 | [diff] [blame] | 138 | if (compat_restore_altstack(&compat_frame->uc.uc_stack)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | goto give_sigsegv; |
| 140 | } else |
| 141 | #endif |
| 142 | { |
| 143 | DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n", |
| 144 | &frame->uc.uc_mcontext); |
| 145 | if (restore_sigcontext(&frame->uc.uc_mcontext, regs)) |
| 146 | goto give_sigsegv; |
| 147 | DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", |
| 148 | usp, &frame->uc.uc_stack); |
Al Viro | 6e26aab | 2012-12-23 03:22:04 -0500 | [diff] [blame] | 149 | if (restore_altstack(&frame->uc.uc_stack)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | goto give_sigsegv; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | |
| 155 | /* If we are on the syscall path IAOQ will not be restored, and |
| 156 | * if we are on the interrupt path we must not corrupt gr31. |
| 157 | */ |
| 158 | if (in_syscall) |
| 159 | regs->gr[31] = regs->iaoq[0]; |
| 160 | #if DEBUG_SIG |
| 161 | DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]); |
| 162 | show_regs(regs); |
| 163 | #endif |
| 164 | return; |
| 165 | |
| 166 | give_sigsegv: |
| 167 | DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n"); |
Kyle McMartin | 67bace7 | 2010-11-29 20:34:38 -0500 | [diff] [blame] | 168 | force_sig(SIGSEGV, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | return; |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * Set up a signal frame. |
| 174 | */ |
| 175 | |
| 176 | static inline void __user * |
| 177 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 178 | { |
| 179 | /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we |
| 180 | don't use the parameter it doesn't matter */ |
| 181 | |
| 182 | DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n", |
| 183 | (unsigned long)ka, sp, frame_size); |
| 184 | |
John David Anglin | ad30f3f | 2012-11-25 21:39:00 +0000 | [diff] [blame] | 185 | /* Align alternate stack and reserve 64 bytes for the signal |
| 186 | handler's frame marker. */ |
Laurent MEYER | d09042d | 2006-06-23 02:05:36 -0700 | [diff] [blame] | 187 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
John David Anglin | ad30f3f | 2012-11-25 21:39:00 +0000 | [diff] [blame] | 188 | sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp); |
| 191 | return (void __user *) sp; /* Stacks grow up. Fun. */ |
| 192 | } |
| 193 | |
| 194 | static long |
| 195 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall) |
| 196 | |
| 197 | { |
| 198 | unsigned long flags = 0; |
| 199 | long err = 0; |
| 200 | |
| 201 | if (on_sig_stack((unsigned long) sc)) |
| 202 | flags |= PARISC_SC_FLAG_ONSTACK; |
| 203 | if (in_syscall) { |
| 204 | flags |= PARISC_SC_FLAG_IN_SYSCALL; |
| 205 | /* regs->iaoq is undefined in the syscall return path */ |
| 206 | err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]); |
| 207 | err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]); |
| 208 | err |= __put_user(regs->sr[3], &sc->sc_iasq[0]); |
| 209 | err |= __put_user(regs->sr[3], &sc->sc_iasq[1]); |
| 210 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n", |
| 211 | regs->gr[31], regs->gr[31]+4); |
| 212 | } else { |
| 213 | err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq)); |
| 214 | err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq)); |
| 215 | DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", |
| 216 | regs->iaoq[0], regs->iaoq[1]); |
| 217 | } |
| 218 | |
| 219 | err |= __put_user(flags, &sc->sc_flags); |
| 220 | err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr)); |
| 221 | err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); |
| 222 | err |= __put_user(regs->sar, &sc->sc_sar); |
| 223 | DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]); |
| 224 | |
| 225 | return err; |
| 226 | } |
| 227 | |
| 228 | static long |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 229 | setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs, |
| 230 | int in_syscall) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
| 232 | struct rt_sigframe __user *frame; |
| 233 | unsigned long rp, usp; |
| 234 | unsigned long haddr, sigframe_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | int err = 0; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 236 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | struct compat_rt_sigframe __user * compat_frame; |
| 238 | compat_sigset_t compat_set; |
| 239 | #endif |
| 240 | |
| 241 | usp = (regs->gr[30] & ~(0x01UL)); |
| 242 | /*FIXME: frame_size parameter is unused, remove it. */ |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 243 | frame = get_sigframe(&ksig->ka, usp, sizeof(*frame)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | DBG(1,"SETUP_RT_FRAME: START\n"); |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 246 | DBG(1,"setup_rt_frame: frame %p info %p\n", frame, ksig->info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 249 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | compat_frame = (struct compat_rt_sigframe __user *)frame; |
| 252 | |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 253 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info); |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 255 | err |= copy_siginfo_to_user32(&compat_frame->info, &ksig->info); |
Al Viro | 6e26aab | 2012-12-23 03:22:04 -0500 | [diff] [blame] | 256 | err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc); |
| 258 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext); |
| 259 | err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, |
| 260 | &compat_frame->regs, regs, in_syscall); |
| 261 | sigset_64to32(&compat_set,set); |
| 262 | err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set)); |
| 263 | } else |
| 264 | #endif |
| 265 | { |
| 266 | DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info); |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 267 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
Al Viro | 6e26aab | 2012-12-23 03:22:04 -0500 | [diff] [blame] | 268 | err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc); |
| 270 | DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext); |
| 271 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall); |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 272 | /* FIXME: Should probably be converted as well for the compat case */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 274 | } |
| 275 | |
| 276 | if (err) |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 277 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
| 279 | /* Set up to return from userspace. If provided, use a stub |
| 280 | already in userspace. The first words of tramp are used to |
| 281 | save the previous sigrestartblock trampoline that might be |
| 282 | on the stack. We start the sigreturn trampoline at |
| 283 | SIGRESTARTBLOCK_TRAMP+X. */ |
| 284 | err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0, |
| 285 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]); |
| 286 | err |= __put_user(INSN_LDI_R20, |
| 287 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]); |
| 288 | err |= __put_user(INSN_BLE_SR2_R0, |
| 289 | &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]); |
| 290 | err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]); |
| 291 | |
| 292 | #if DEBUG_SIG |
| 293 | /* Assert that we're flushing in the correct space... */ |
| 294 | { |
John David Anglin | 45b6eff | 2013-02-02 23:43:06 +0000 | [diff] [blame] | 295 | unsigned long sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | asm ("mfsp %%sr3,%0" : "=r" (sid)); |
| 297 | DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n", |
| 298 | sid, frame->tramp); |
| 299 | } |
| 300 | #endif |
| 301 | |
| 302 | flush_user_dcache_range((unsigned long) &frame->tramp[0], |
| 303 | (unsigned long) &frame->tramp[TRAMP_SIZE]); |
| 304 | flush_user_icache_range((unsigned long) &frame->tramp[0], |
| 305 | (unsigned long) &frame->tramp[TRAMP_SIZE]); |
| 306 | |
Paulius Zaleckas | efad798b | 2008-02-03 15:42:53 +0200 | [diff] [blame] | 307 | /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP |
| 309 | * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP |
| 310 | */ |
| 311 | rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP]; |
| 312 | |
| 313 | if (err) |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 314 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 316 | haddr = A(ksig->ka.sa.sa_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | /* The sa_handler may be a pointer to a function descriptor */ |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 318 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 319 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | #endif |
| 321 | if (haddr & PA_PLABEL_FDESC) { |
| 322 | Elf32_Fdesc fdesc; |
| 323 | Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3); |
| 324 | |
| 325 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); |
| 326 | |
| 327 | if (err) |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 328 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | haddr = fdesc.addr; |
| 331 | regs->gr[19] = fdesc.gp; |
| 332 | } |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 333 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } else { |
| 335 | Elf64_Fdesc fdesc; |
| 336 | Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); |
| 337 | |
| 338 | err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); |
| 339 | |
| 340 | if (err) |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 341 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | haddr = fdesc.addr; |
| 344 | regs->gr[19] = fdesc.gp; |
| 345 | DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n", |
| 346 | haddr, regs->gr[19], in_syscall); |
| 347 | } |
| 348 | #endif |
| 349 | |
| 350 | /* The syscall return path will create IAOQ values from r31. |
| 351 | */ |
| 352 | sigframe_size = PARISC_RT_SIGFRAME_SIZE; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 353 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 354 | if (is_compat_task()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | sigframe_size = PARISC_RT_SIGFRAME_SIZE32; |
| 356 | #endif |
| 357 | if (in_syscall) { |
| 358 | regs->gr[31] = haddr; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 359 | #ifdef CONFIG_64BIT |
Kyle McMartin | df570b9 | 2006-08-27 11:04:26 -0400 | [diff] [blame] | 360 | if (!test_thread_flag(TIF_32BIT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | sigframe_size |= 1; |
| 362 | #endif |
| 363 | } else { |
| 364 | unsigned long psw = USER_PSW; |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 365 | #ifdef CONFIG_64BIT |
Kyle McMartin | df570b9 | 2006-08-27 11:04:26 -0400 | [diff] [blame] | 366 | if (!test_thread_flag(TIF_32BIT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | psw |= PSW_W; |
| 368 | #endif |
| 369 | |
| 370 | /* If we are singlestepping, arrange a trap to be delivered |
| 371 | when we return to userspace. Note the semantics -- we |
| 372 | should trap before the first insn in the handler is |
| 373 | executed. Ref: |
| 374 | http://sources.redhat.com/ml/gdb/2004-11/msg00245.html |
| 375 | */ |
| 376 | if (pa_psw(current)->r) { |
| 377 | pa_psw(current)->r = 0; |
| 378 | psw |= PSW_R; |
| 379 | mtctl(-1, 0); |
| 380 | } |
| 381 | |
| 382 | regs->gr[0] = psw; |
| 383 | regs->iaoq[0] = haddr | 3; |
| 384 | regs->iaoq[1] = regs->iaoq[0] + 4; |
| 385 | } |
| 386 | |
| 387 | regs->gr[2] = rp; /* userland return pointer */ |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 388 | regs->gr[26] = ksig->sig; /* signal number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
Helge Deller | a8f44e3 | 2007-01-28 14:58:52 +0100 | [diff] [blame] | 390 | #ifdef CONFIG_64BIT |
Kyle McMartin | a3ea84f | 2006-06-16 19:10:02 +0000 | [diff] [blame] | 391 | if (is_compat_task()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ |
| 393 | regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ |
| 394 | } else |
| 395 | #endif |
| 396 | { |
| 397 | regs->gr[25] = A(&frame->info); /* siginfo pointer */ |
| 398 | regs->gr[24] = A(&frame->uc); /* ucontext pointer */ |
| 399 | } |
| 400 | |
| 401 | DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n", |
| 402 | regs->gr[30], sigframe_size, |
| 403 | regs->gr[30] + sigframe_size); |
| 404 | /* Raise the user stack pointer to make a proper call frame. */ |
| 405 | regs->gr[30] = (A(frame) + sigframe_size); |
| 406 | |
| 407 | |
| 408 | DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n", |
| 409 | current->comm, current->pid, frame, regs->gr[30], |
| 410 | regs->iaoq[0], regs->iaoq[1], rp); |
| 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * OK, we're invoking a handler. |
| 417 | */ |
| 418 | |
Al Viro | e3b880c | 2012-05-19 01:13:01 -0400 | [diff] [blame] | 419 | static void |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 420 | handle_signal(struct ksignal *ksig, struct pt_regs *regs, int in_syscall) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | { |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 422 | int ret; |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 423 | sigset_t *oldset = sigmask_to_save(); |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n", |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 426 | ksig->sig, ksig->ka, ksig->info, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | /* Set up the stack frame */ |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 429 | ret = setup_rt_frame(ksig, oldset, regs, in_syscall); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 431 | signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP) || |
| 432 | test_thread_flag(TIF_BLOCKSTEP)); |
Kyle McMartin | ecf02de | 2009-04-27 00:29:53 -0400 | [diff] [blame] | 433 | |
Al Viro | a610d6e | 2012-05-21 23:42:15 -0400 | [diff] [blame] | 434 | DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", |
| 435 | regs->gr[28]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | } |
| 437 | |
Helge Deller | 71a71fb | 2015-12-21 10:03:30 +0100 | [diff] [blame] | 438 | /* |
| 439 | * Check how the syscall number gets loaded into %r20 within |
| 440 | * the delay branch in userspace and adjust as needed. |
| 441 | */ |
| 442 | |
| 443 | static void check_syscallno_in_delay_branch(struct pt_regs *regs) |
| 444 | { |
| 445 | u32 opcode, source_reg; |
| 446 | u32 __user *uaddr; |
| 447 | int err; |
| 448 | |
| 449 | /* Usually we don't have to restore %r20 (the system call number) |
| 450 | * because it gets loaded in the delay slot of the branch external |
| 451 | * instruction via the ldi instruction. |
| 452 | * In some cases a register-to-register copy instruction might have |
| 453 | * been used instead, in which case we need to copy the syscall |
| 454 | * number into the source register before returning to userspace. |
| 455 | */ |
| 456 | |
| 457 | /* A syscall is just a branch, so all we have to do is fiddle the |
| 458 | * return pointer so that the ble instruction gets executed again. |
| 459 | */ |
| 460 | regs->gr[31] -= 8; /* delayed branching */ |
| 461 | |
| 462 | /* Get assembler opcode of code in delay branch */ |
| 463 | uaddr = (unsigned int *) ((regs->gr[31] & ~3) + 4); |
| 464 | err = get_user(opcode, uaddr); |
| 465 | if (err) |
| 466 | return; |
| 467 | |
| 468 | /* Check if delay branch uses "ldi int,%r20" */ |
| 469 | if ((opcode & 0xffff0000) == 0x34140000) |
| 470 | return; /* everything ok, just return */ |
| 471 | |
| 472 | /* Check if delay branch uses "nop" */ |
| 473 | if (opcode == INSN_NOP) |
| 474 | return; |
| 475 | |
| 476 | /* Check if delay branch uses "copy %rX,%r20" */ |
| 477 | if ((opcode & 0xffe0ffff) == 0x08000254) { |
| 478 | source_reg = (opcode >> 16) & 31; |
| 479 | regs->gr[source_reg] = regs->gr[20]; |
| 480 | return; |
| 481 | } |
| 482 | |
| 483 | pr_warn("syscall restart: %s (pid %d): unexpected opcode 0x%08x\n", |
| 484 | current->comm, task_pid_nr(current), opcode); |
| 485 | } |
| 486 | |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 487 | static inline void |
| 488 | syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) |
| 489 | { |
Al Viro | 00df111 | 2012-05-19 00:29:22 -0400 | [diff] [blame] | 490 | if (regs->orig_r28) |
| 491 | return; |
| 492 | regs->orig_r28 = 1; /* no more restarts */ |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 493 | /* Check the return code */ |
| 494 | switch (regs->gr[28]) { |
| 495 | case -ERESTART_RESTARTBLOCK: |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 496 | case -ERESTARTNOHAND: |
| 497 | DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); |
| 498 | regs->gr[28] = -EINTR; |
| 499 | break; |
| 500 | |
| 501 | case -ERESTARTSYS: |
| 502 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
| 503 | DBG(1,"ERESTARTSYS: putting -EINTR\n"); |
| 504 | regs->gr[28] = -EINTR; |
| 505 | break; |
| 506 | } |
| 507 | /* fallthrough */ |
| 508 | case -ERESTARTNOINTR: |
Helge Deller | 71a71fb | 2015-12-21 10:03:30 +0100 | [diff] [blame] | 509 | check_syscallno_in_delay_branch(regs); |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 510 | break; |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | static inline void |
| 515 | insert_restart_trampoline(struct pt_regs *regs) |
| 516 | { |
Al Viro | 00df111 | 2012-05-19 00:29:22 -0400 | [diff] [blame] | 517 | if (regs->orig_r28) |
| 518 | return; |
| 519 | regs->orig_r28 = 1; /* no more restarts */ |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 520 | switch(regs->gr[28]) { |
| 521 | case -ERESTART_RESTARTBLOCK: { |
| 522 | /* Restart the system call - no handlers present */ |
| 523 | unsigned int *usp = (unsigned int *)regs->gr[30]; |
Helge Deller | 0bd1e94 | 2015-02-03 21:52:47 +0100 | [diff] [blame] | 524 | unsigned long start = (unsigned long) &usp[2]; |
| 525 | unsigned long end = (unsigned long) &usp[5]; |
| 526 | long err = 0; |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 527 | |
| 528 | /* Setup a trampoline to restart the syscall |
| 529 | * with __NR_restart_syscall |
| 530 | * |
| 531 | * 0: <return address (orig r31)> |
| 532 | * 4: <2nd half for 64-bit> |
| 533 | * 8: ldw 0(%sp), %r31 |
| 534 | * 12: be 0x100(%sr2, %r0) |
| 535 | * 16: ldi __NR_restart_syscall, %r20 |
| 536 | */ |
| 537 | #ifdef CONFIG_64BIT |
Helge Deller | 0bd1e94 | 2015-02-03 21:52:47 +0100 | [diff] [blame] | 538 | err |= put_user(regs->gr[31] >> 32, &usp[0]); |
| 539 | err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]); |
| 540 | err |= put_user(0x0fc010df, &usp[2]); |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 541 | #else |
Helge Deller | 0bd1e94 | 2015-02-03 21:52:47 +0100 | [diff] [blame] | 542 | err |= put_user(regs->gr[31], &usp[0]); |
| 543 | err |= put_user(0x0fc0109f, &usp[2]); |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 544 | #endif |
Helge Deller | 0bd1e94 | 2015-02-03 21:52:47 +0100 | [diff] [blame] | 545 | err |= put_user(0xe0008200, &usp[3]); |
| 546 | err |= put_user(0x34140000, &usp[4]); |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 547 | |
Helge Deller | 0bd1e94 | 2015-02-03 21:52:47 +0100 | [diff] [blame] | 548 | WARN_ON(err); |
| 549 | |
| 550 | /* flush data/instruction cache for new insns */ |
| 551 | flush_user_dcache_range(start, end); |
| 552 | flush_user_icache_range(start, end); |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 553 | |
| 554 | regs->gr[31] = regs->gr[30] + 8; |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 555 | return; |
| 556 | } |
| 557 | case -ERESTARTNOHAND: |
| 558 | case -ERESTARTSYS: |
Helge Deller | 71a71fb | 2015-12-21 10:03:30 +0100 | [diff] [blame] | 559 | case -ERESTARTNOINTR: |
| 560 | check_syscallno_in_delay_branch(regs); |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 561 | return; |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 562 | default: |
| 563 | break; |
| 564 | } |
| 565 | } |
| 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | /* |
| 568 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 569 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 570 | * mistake. |
| 571 | * |
| 572 | * We need to be able to restore the syscall arguments (r21-r26) to |
| 573 | * restart syscalls. Thus, the syscall path should save them in the |
| 574 | * pt_regs structure (it's okay to do so since they are caller-save |
| 575 | * registers). As noted below, the syscall number gets restored for |
| 576 | * us due to the magic of delayed branching. |
| 577 | */ |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 578 | asmlinkage void |
| 579 | do_signal(struct pt_regs *regs, long in_syscall) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | { |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 581 | struct ksignal ksig; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 583 | DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n", |
| 584 | regs, regs->sr[7], in_syscall); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 586 | if (get_signal(&ksig)) { |
| 587 | DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | /* Restart a system call if necessary. */ |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 589 | if (in_syscall) |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 590 | syscall_restart(regs, &ksig.ka); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Richard Weinberger | e4dc894 | 2013-10-07 14:34:10 +0200 | [diff] [blame] | 592 | handle_signal(&ksig, regs, in_syscall); |
Al Viro | e3b880c | 2012-05-19 01:13:01 -0400 | [diff] [blame] | 593 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
| 596 | /* Did we come from a system call? */ |
Kyle McMartin | 2b163b7 | 2007-01-15 00:36:26 -0500 | [diff] [blame] | 597 | if (in_syscall) |
| 598 | insert_restart_trampoline(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", |
| 601 | regs->gr[28]); |
| 602 | |
Al Viro | 51a7b44 | 2012-05-21 23:33:55 -0400 | [diff] [blame] | 603 | restore_saved_sigmask(); |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | void do_notify_resume(struct pt_regs *regs, long in_syscall) |
| 607 | { |
Al Viro | 6fd84c0 | 2012-05-23 15:28:58 -0400 | [diff] [blame] | 608 | if (test_thread_flag(TIF_SIGPENDING)) |
Kyle McMartin | 4650f0a | 2007-01-08 16:28:06 -0500 | [diff] [blame] | 609 | do_signal(regs, in_syscall); |
David Howells | d0420c8 | 2009-09-02 09:14:16 +0100 | [diff] [blame] | 610 | |
| 611 | if (test_thread_flag(TIF_NOTIFY_RESUME)) { |
| 612 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 613 | tracehook_notify_resume(regs); |
| 614 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |