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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*  arch/sparc64/kernel/signal32.c
0003  *
0004  *  Copyright (C) 1991, 1992  Linus Torvalds
0005  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
0006  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
0007  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
0008  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
0009  */
0010 
0011 #include <linux/sched.h>
0012 #include <linux/kernel.h>
0013 #include <linux/signal.h>
0014 #include <linux/errno.h>
0015 #include <linux/wait.h>
0016 #include <linux/ptrace.h>
0017 #include <linux/unistd.h>
0018 #include <linux/mm.h>
0019 #include <linux/tty.h>
0020 #include <linux/binfmts.h>
0021 #include <linux/compat.h>
0022 #include <linux/bitops.h>
0023 
0024 #include <linux/uaccess.h>
0025 #include <asm/ptrace.h>
0026 #include <asm/psrcompat.h>
0027 #include <asm/fpumacro.h>
0028 #include <asm/visasm.h>
0029 #include <asm/compat_signal.h>
0030 #include <asm/switch_to.h>
0031 
0032 #include "sigutil.h"
0033 #include "kernel.h"
0034 
0035 /* This magic should be in g_upper[0] for all upper parts
0036  * to be valid.
0037  */
0038 #define SIGINFO_EXTRA_V8PLUS_MAGIC  0x130e269
0039 typedef struct {
0040     unsigned int g_upper[8];
0041     unsigned int o_upper[8];
0042     unsigned int asi;
0043 } siginfo_extra_v8plus_t;
0044 
0045 struct signal_frame32 {
0046     struct sparc_stackf32   ss;
0047     __siginfo32_t       info;
0048     /* __siginfo_fpu_t * */ u32 fpu_save;
0049     unsigned int        insns[2];
0050     unsigned int        extramask[_COMPAT_NSIG_WORDS - 1];
0051     unsigned int        extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
0052     /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
0053     siginfo_extra_v8plus_t  v8plus;
0054     /* __siginfo_rwin_t * */u32 rwin_save;
0055 } __attribute__((aligned(8)));
0056 
0057 struct rt_signal_frame32 {
0058     struct sparc_stackf32   ss;
0059     compat_siginfo_t    info;
0060     struct pt_regs32    regs;
0061     compat_sigset_t     mask;
0062     /* __siginfo_fpu_t * */ u32 fpu_save;
0063     unsigned int        insns[2];
0064     compat_stack_t      stack;
0065     unsigned int        extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
0066     /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
0067     siginfo_extra_v8plus_t  v8plus;
0068     /* __siginfo_rwin_t * */u32 rwin_save;
0069 } __attribute__((aligned(8)));
0070 
0071 /* Checks if the fp is valid.  We always build signal frames which are
0072  * 16-byte aligned, therefore we can always enforce that the restore
0073  * frame has that property as well.
0074  */
0075 static bool invalid_frame_pointer(void __user *fp, int fplen)
0076 {
0077     if ((((unsigned long) fp) & 15) ||
0078         ((unsigned long)fp) > 0x100000000ULL - fplen)
0079         return true;
0080     return false;
0081 }
0082 
0083 void do_sigreturn32(struct pt_regs *regs)
0084 {
0085     struct signal_frame32 __user *sf;
0086     compat_uptr_t fpu_save;
0087     compat_uptr_t rwin_save;
0088     unsigned int psr, ufp;
0089     unsigned int pc, npc;
0090     sigset_t set;
0091     compat_sigset_t seta;
0092     int err, i;
0093     
0094     /* Always make any pending restarted system calls return -EINTR */
0095     current->restart_block.fn = do_no_restart_syscall;
0096 
0097     synchronize_user_stack();
0098 
0099     regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
0100     sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
0101 
0102     /* 1. Make sure we are not getting garbage from the user */
0103     if (invalid_frame_pointer(sf, sizeof(*sf)))
0104         goto segv;
0105 
0106     if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
0107         goto segv;
0108 
0109     if (ufp & 0x7)
0110         goto segv;
0111 
0112     if (__get_user(pc, &sf->info.si_regs.pc) ||
0113         __get_user(npc, &sf->info.si_regs.npc))
0114         goto segv;
0115 
0116     if ((pc | npc) & 3)
0117         goto segv;
0118 
0119     if (test_thread_flag(TIF_32BIT)) {
0120         pc &= 0xffffffff;
0121         npc &= 0xffffffff;
0122     }
0123     regs->tpc = pc;
0124     regs->tnpc = npc;
0125 
0126     /* 2. Restore the state */
0127     err = __get_user(regs->y, &sf->info.si_regs.y);
0128     err |= __get_user(psr, &sf->info.si_regs.psr);
0129 
0130     for (i = UREG_G1; i <= UREG_I7; i++)
0131         err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
0132     if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
0133         err |= __get_user(i, &sf->v8plus.g_upper[0]);
0134         if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
0135             unsigned long asi;
0136 
0137             for (i = UREG_G1; i <= UREG_I7; i++)
0138                 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
0139             err |= __get_user(asi, &sf->v8plus.asi);
0140             regs->tstate &= ~TSTATE_ASI;
0141             regs->tstate |= ((asi & 0xffUL) << 24UL);
0142         }
0143     }
0144 
0145     /* User can only change condition codes in %tstate. */
0146     regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
0147     regs->tstate |= psr_to_tstate_icc(psr);
0148 
0149     /* Prevent syscall restart.  */
0150     pt_regs_clear_syscall(regs);
0151 
0152     err |= __get_user(fpu_save, &sf->fpu_save);
0153     if (!err && fpu_save)
0154         err |= restore_fpu_state(regs, compat_ptr(fpu_save));
0155     err |= __get_user(rwin_save, &sf->rwin_save);
0156     if (!err && rwin_save) {
0157         if (restore_rwin_state(compat_ptr(rwin_save)))
0158             goto segv;
0159     }
0160     err |= __get_user(seta.sig[0], &sf->info.si_mask);
0161     err |= copy_from_user(&seta.sig[1], &sf->extramask,
0162                   (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
0163     if (err)
0164             goto segv;
0165 
0166     set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
0167     set_current_blocked(&set);
0168     return;
0169 
0170 segv:
0171     force_sig(SIGSEGV);
0172 }
0173 
0174 asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
0175 {
0176     struct rt_signal_frame32 __user *sf;
0177     unsigned int psr, pc, npc, ufp;
0178     compat_uptr_t fpu_save;
0179     compat_uptr_t rwin_save;
0180     sigset_t set;
0181     int err, i;
0182     
0183     /* Always make any pending restarted system calls return -EINTR */
0184     current->restart_block.fn = do_no_restart_syscall;
0185 
0186     synchronize_user_stack();
0187     regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
0188     sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
0189 
0190     /* 1. Make sure we are not getting garbage from the user */
0191     if (invalid_frame_pointer(sf, sizeof(*sf)))
0192         goto segv;
0193 
0194     if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
0195         goto segv;
0196 
0197     if (ufp & 0x7)
0198         goto segv;
0199 
0200     if (__get_user(pc, &sf->regs.pc) || 
0201         __get_user(npc, &sf->regs.npc))
0202         goto segv;
0203 
0204     if ((pc | npc) & 3)
0205         goto segv;
0206 
0207     if (test_thread_flag(TIF_32BIT)) {
0208         pc &= 0xffffffff;
0209         npc &= 0xffffffff;
0210     }
0211     regs->tpc = pc;
0212     regs->tnpc = npc;
0213 
0214     /* 2. Restore the state */
0215     err = __get_user(regs->y, &sf->regs.y);
0216     err |= __get_user(psr, &sf->regs.psr);
0217     
0218     for (i = UREG_G1; i <= UREG_I7; i++)
0219         err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
0220     if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
0221         err |= __get_user(i, &sf->v8plus.g_upper[0]);
0222         if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
0223             unsigned long asi;
0224 
0225             for (i = UREG_G1; i <= UREG_I7; i++)
0226                 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
0227             err |= __get_user(asi, &sf->v8plus.asi);
0228             regs->tstate &= ~TSTATE_ASI;
0229             regs->tstate |= ((asi & 0xffUL) << 24UL);
0230         }
0231     }
0232 
0233     /* User can only change condition codes in %tstate. */
0234     regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
0235     regs->tstate |= psr_to_tstate_icc(psr);
0236 
0237     /* Prevent syscall restart.  */
0238     pt_regs_clear_syscall(regs);
0239 
0240     err |= __get_user(fpu_save, &sf->fpu_save);
0241     if (!err && fpu_save)
0242         err |= restore_fpu_state(regs, compat_ptr(fpu_save));
0243     err |= get_compat_sigset(&set, &sf->mask);
0244     err |= compat_restore_altstack(&sf->stack);
0245     if (err)
0246         goto segv;
0247         
0248     err |= __get_user(rwin_save, &sf->rwin_save);
0249     if (!err && rwin_save) {
0250         if (restore_rwin_state(compat_ptr(rwin_save)))
0251             goto segv;
0252     }
0253 
0254     set_current_blocked(&set);
0255     return;
0256 segv:
0257     force_sig(SIGSEGV);
0258 }
0259 
0260 static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
0261 {
0262     unsigned long sp;
0263     
0264     regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
0265     sp = regs->u_regs[UREG_FP];
0266     
0267     /*
0268      * If we are on the alternate signal stack and would overflow it, don't.
0269      * Return an always-bogus address instead so we will die with SIGSEGV.
0270      */
0271     if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
0272         return (void __user *) -1L;
0273 
0274     /* This is the X/Open sanctioned signal stack switching.  */
0275     sp = sigsp(sp, ksig) - framesize;
0276 
0277     /* Always align the stack frame.  This handles two cases.  First,
0278      * sigaltstack need not be mindful of platform specific stack
0279      * alignment.  Second, if we took this signal because the stack
0280      * is not aligned properly, we'd like to take the signal cleanly
0281      * and report that.
0282      */
0283     sp &= ~15UL;
0284 
0285     return (void __user *) sp;
0286 }
0287 
0288 /* The I-cache flush instruction only works in the primary ASI, which
0289  * right now is the nucleus, aka. kernel space.
0290  *
0291  * Therefore we have to kick the instructions out using the kernel
0292  * side linear mapping of the physical address backing the user
0293  * instructions.
0294  */
0295 static void flush_signal_insns(unsigned long address)
0296 {
0297     unsigned long pstate, paddr;
0298     pte_t *ptep, pte;
0299     pgd_t *pgdp;
0300     p4d_t *p4dp;
0301     pud_t *pudp;
0302     pmd_t *pmdp;
0303 
0304     /* Commit all stores of the instructions we are about to flush.  */
0305     wmb();
0306 
0307     /* Disable cross-call reception.  In this way even a very wide
0308      * munmap() on another cpu can't tear down the page table
0309      * hierarchy from underneath us, since that can't complete
0310      * until the IPI tlb flush returns.
0311      */
0312 
0313     __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
0314     __asm__ __volatile__("wrpr %0, %1, %%pstate"
0315                 : : "r" (pstate), "i" (PSTATE_IE));
0316 
0317     pgdp = pgd_offset(current->mm, address);
0318     if (pgd_none(*pgdp))
0319         goto out_irqs_on;
0320     p4dp = p4d_offset(pgdp, address);
0321     if (p4d_none(*p4dp))
0322         goto out_irqs_on;
0323     pudp = pud_offset(p4dp, address);
0324     if (pud_none(*pudp))
0325         goto out_irqs_on;
0326     pmdp = pmd_offset(pudp, address);
0327     if (pmd_none(*pmdp))
0328         goto out_irqs_on;
0329 
0330     ptep = pte_offset_map(pmdp, address);
0331     pte = *ptep;
0332     if (!pte_present(pte))
0333         goto out_unmap;
0334 
0335     paddr = (unsigned long) page_address(pte_page(pte));
0336 
0337     __asm__ __volatile__("flush %0 + %1"
0338                  : /* no outputs */
0339                  : "r" (paddr),
0340                    "r" (address & (PAGE_SIZE - 1))
0341                  : "memory");
0342 
0343 out_unmap:
0344     pte_unmap(ptep);
0345 out_irqs_on:
0346     __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
0347 
0348 }
0349 
0350 static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
0351              sigset_t *oldset)
0352 {
0353     struct signal_frame32 __user *sf;
0354     int i, err, wsaved;
0355     void __user *tail;
0356     int sigframe_size;
0357     u32 psr;
0358     compat_sigset_t seta;
0359 
0360     /* 1. Make sure everything is clean */
0361     synchronize_user_stack();
0362     save_and_clear_fpu();
0363     
0364     wsaved = get_thread_wsaved();
0365 
0366     sigframe_size = sizeof(*sf);
0367     if (current_thread_info()->fpsaved[0] & FPRS_FEF)
0368         sigframe_size += sizeof(__siginfo_fpu_t);
0369     if (wsaved)
0370         sigframe_size += sizeof(__siginfo_rwin_t);
0371 
0372     sf = (struct signal_frame32 __user *)
0373         get_sigframe(ksig, regs, sigframe_size);
0374     
0375     if (invalid_frame_pointer(sf, sigframe_size)) {
0376         if (show_unhandled_signals)
0377             pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n",
0378                 current->comm, current->pid, (unsigned long)sf,
0379                 regs->tpc, regs->u_regs[UREG_I7]);
0380         force_sigsegv(ksig->sig);
0381         return -EINVAL;
0382     }
0383 
0384     tail = (sf + 1);
0385 
0386     /* 2. Save the current process state */
0387     if (test_thread_flag(TIF_32BIT)) {
0388         regs->tpc &= 0xffffffff;
0389         regs->tnpc &= 0xffffffff;
0390     }
0391     err  = put_user(regs->tpc, &sf->info.si_regs.pc);
0392     err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
0393     err |= __put_user(regs->y, &sf->info.si_regs.y);
0394     psr = tstate_to_psr(regs->tstate);
0395     if (current_thread_info()->fpsaved[0] & FPRS_FEF)
0396         psr |= PSR_EF;
0397     err |= __put_user(psr, &sf->info.si_regs.psr);
0398     for (i = 0; i < 16; i++)
0399         err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
0400     err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
0401     err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
0402     for (i = 1; i < 16; i++)
0403         err |= __put_user(((u32 *)regs->u_regs)[2*i],
0404                   &sf->v8plus.g_upper[i]);
0405     err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
0406               &sf->v8plus.asi);
0407 
0408     if (psr & PSR_EF) {
0409         __siginfo_fpu_t __user *fp = tail;
0410         tail += sizeof(*fp);
0411         err |= save_fpu_state(regs, fp);
0412         err |= __put_user((u64)fp, &sf->fpu_save);
0413     } else {
0414         err |= __put_user(0, &sf->fpu_save);
0415     }
0416     if (wsaved) {
0417         __siginfo_rwin_t __user *rwp = tail;
0418         tail += sizeof(*rwp);
0419         err |= save_rwin_state(wsaved, rwp);
0420         err |= __put_user((u64)rwp, &sf->rwin_save);
0421         set_thread_wsaved(0);
0422     } else {
0423         err |= __put_user(0, &sf->rwin_save);
0424     }
0425 
0426     /* If these change we need to know - assignments to seta relies on these sizes */
0427     BUILD_BUG_ON(_NSIG_WORDS != 1);
0428     BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2);
0429     seta.sig[1] = (oldset->sig[0] >> 32);
0430     seta.sig[0] = oldset->sig[0];
0431 
0432     err |= __put_user(seta.sig[0], &sf->info.si_mask);
0433     err |= __copy_to_user(sf->extramask, &seta.sig[1],
0434                   (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
0435 
0436     if (!wsaved) {
0437         err |= raw_copy_in_user((u32 __user *)sf,
0438                     (u32 __user *)(regs->u_regs[UREG_FP]),
0439                     sizeof(struct reg_window32));
0440     } else {
0441         struct reg_window *rp;
0442 
0443         rp = &current_thread_info()->reg_window[wsaved - 1];
0444         for (i = 0; i < 8; i++)
0445             err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
0446         for (i = 0; i < 6; i++)
0447             err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
0448         err |= __put_user(rp->ins[6], &sf->ss.fp);
0449         err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
0450     }   
0451     if (err)
0452         return err;
0453 
0454     /* 3. signal handler back-trampoline and parameters */
0455     regs->u_regs[UREG_FP] = (unsigned long) sf;
0456     regs->u_regs[UREG_I0] = ksig->sig;
0457     regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
0458     regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
0459 
0460     /* 4. signal handler */
0461     regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
0462     regs->tnpc = (regs->tpc + 4);
0463     if (test_thread_flag(TIF_32BIT)) {
0464         regs->tpc &= 0xffffffff;
0465         regs->tnpc &= 0xffffffff;
0466     }
0467 
0468     /* 5. return to kernel instructions */
0469     if (ksig->ka.ka_restorer) {
0470         regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
0471     } else {
0472         unsigned long address = ((unsigned long)&(sf->insns[0]));
0473 
0474         regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
0475     
0476         err  = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
0477         err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
0478         if (err)
0479             return err;
0480         flush_signal_insns(address);
0481     }
0482     return 0;
0483 }
0484 
0485 static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
0486                 sigset_t *oldset)
0487 {
0488     struct rt_signal_frame32 __user *sf;
0489     int i, err, wsaved;
0490     void __user *tail;
0491     int sigframe_size;
0492     u32 psr;
0493 
0494     /* 1. Make sure everything is clean */
0495     synchronize_user_stack();
0496     save_and_clear_fpu();
0497     
0498     wsaved = get_thread_wsaved();
0499 
0500     sigframe_size = sizeof(*sf);
0501     if (current_thread_info()->fpsaved[0] & FPRS_FEF)
0502         sigframe_size += sizeof(__siginfo_fpu_t);
0503     if (wsaved)
0504         sigframe_size += sizeof(__siginfo_rwin_t);
0505 
0506     sf = (struct rt_signal_frame32 __user *)
0507         get_sigframe(ksig, regs, sigframe_size);
0508     
0509     if (invalid_frame_pointer(sf, sigframe_size)) {
0510         if (show_unhandled_signals)
0511             pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n",
0512                 current->comm, current->pid, (unsigned long)sf,
0513                 regs->tpc, regs->u_regs[UREG_I7]);
0514         force_sigsegv(ksig->sig);
0515         return -EINVAL;
0516     }
0517 
0518     tail = (sf + 1);
0519 
0520     /* 2. Save the current process state */
0521     if (test_thread_flag(TIF_32BIT)) {
0522         regs->tpc &= 0xffffffff;
0523         regs->tnpc &= 0xffffffff;
0524     }
0525     err  = put_user(regs->tpc, &sf->regs.pc);
0526     err |= __put_user(regs->tnpc, &sf->regs.npc);
0527     err |= __put_user(regs->y, &sf->regs.y);
0528     psr = tstate_to_psr(regs->tstate);
0529     if (current_thread_info()->fpsaved[0] & FPRS_FEF)
0530         psr |= PSR_EF;
0531     err |= __put_user(psr, &sf->regs.psr);
0532     for (i = 0; i < 16; i++)
0533         err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
0534     err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
0535     err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
0536     for (i = 1; i < 16; i++)
0537         err |= __put_user(((u32 *)regs->u_regs)[2*i],
0538                   &sf->v8plus.g_upper[i]);
0539     err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
0540               &sf->v8plus.asi);
0541 
0542     if (psr & PSR_EF) {
0543         __siginfo_fpu_t __user *fp = tail;
0544         tail += sizeof(*fp);
0545         err |= save_fpu_state(regs, fp);
0546         err |= __put_user((u64)fp, &sf->fpu_save);
0547     } else {
0548         err |= __put_user(0, &sf->fpu_save);
0549     }
0550     if (wsaved) {
0551         __siginfo_rwin_t __user *rwp = tail;
0552         tail += sizeof(*rwp);
0553         err |= save_rwin_state(wsaved, rwp);
0554         err |= __put_user((u64)rwp, &sf->rwin_save);
0555         set_thread_wsaved(0);
0556     } else {
0557         err |= __put_user(0, &sf->rwin_save);
0558     }
0559 
0560     /* Update the siginfo structure.  */
0561     err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
0562     
0563     /* Setup sigaltstack */
0564     err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
0565 
0566     err |= put_compat_sigset(&sf->mask, oldset, sizeof(compat_sigset_t));
0567 
0568     if (!wsaved) {
0569         err |= raw_copy_in_user((u32 __user *)sf,
0570                     (u32 __user *)(regs->u_regs[UREG_FP]),
0571                     sizeof(struct reg_window32));
0572     } else {
0573         struct reg_window *rp;
0574 
0575         rp = &current_thread_info()->reg_window[wsaved - 1];
0576         for (i = 0; i < 8; i++)
0577             err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
0578         for (i = 0; i < 6; i++)
0579             err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
0580         err |= __put_user(rp->ins[6], &sf->ss.fp);
0581         err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
0582     }
0583     if (err)
0584         return err;
0585     
0586     /* 3. signal handler back-trampoline and parameters */
0587     regs->u_regs[UREG_FP] = (unsigned long) sf;
0588     regs->u_regs[UREG_I0] = ksig->sig;
0589     regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
0590     regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
0591 
0592     /* 4. signal handler */
0593     regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
0594     regs->tnpc = (regs->tpc + 4);
0595     if (test_thread_flag(TIF_32BIT)) {
0596         regs->tpc &= 0xffffffff;
0597         regs->tnpc &= 0xffffffff;
0598     }
0599 
0600     /* 5. return to kernel instructions */
0601     if (ksig->ka.ka_restorer)
0602         regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
0603     else {
0604         unsigned long address = ((unsigned long)&(sf->insns[0]));
0605 
0606         regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
0607     
0608         /* mov __NR_rt_sigreturn, %g1 */
0609         err |= __put_user(0x82102065, &sf->insns[0]);
0610 
0611         /* t 0x10 */
0612         err |= __put_user(0x91d02010, &sf->insns[1]);
0613         if (err)
0614             return err;
0615 
0616         flush_signal_insns(address);
0617     }
0618     return 0;
0619 }
0620 
0621 static inline void handle_signal32(struct ksignal *ksig, 
0622                   struct pt_regs *regs)
0623 {
0624     sigset_t *oldset = sigmask_to_save();
0625     int err;
0626 
0627     if (ksig->ka.sa.sa_flags & SA_SIGINFO)
0628         err = setup_rt_frame32(ksig, regs, oldset);
0629     else
0630         err = setup_frame32(ksig, regs, oldset);
0631 
0632     signal_setup_done(err, ksig, 0);
0633 }
0634 
0635 static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
0636                      struct sigaction *sa)
0637 {
0638     switch (regs->u_regs[UREG_I0]) {
0639     case ERESTART_RESTARTBLOCK:
0640     case ERESTARTNOHAND:
0641     no_system_call_restart:
0642         regs->u_regs[UREG_I0] = EINTR;
0643         regs->tstate |= TSTATE_ICARRY;
0644         break;
0645     case ERESTARTSYS:
0646         if (!(sa->sa_flags & SA_RESTART))
0647             goto no_system_call_restart;
0648         fallthrough;
0649     case ERESTARTNOINTR:
0650         regs->u_regs[UREG_I0] = orig_i0;
0651         regs->tpc -= 4;
0652         regs->tnpc -= 4;
0653     }
0654 }
0655 
0656 /* Note that 'init' is a special process: it doesn't get signals it doesn't
0657  * want to handle. Thus you cannot kill init even with a SIGKILL even by
0658  * mistake.
0659  */
0660 void do_signal32(struct pt_regs * regs)
0661 {
0662     struct ksignal ksig;
0663     unsigned long orig_i0 = 0;
0664     int restart_syscall = 0;
0665     bool has_handler = get_signal(&ksig);
0666 
0667     if (pt_regs_is_syscall(regs) &&
0668         (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
0669         restart_syscall = 1;
0670         orig_i0 = regs->u_regs[UREG_G6];
0671     }
0672 
0673     if (has_handler) {
0674         if (restart_syscall)
0675             syscall_restart32(orig_i0, regs, &ksig.ka.sa);
0676         handle_signal32(&ksig, regs);
0677     } else {
0678         if (restart_syscall) {
0679             switch (regs->u_regs[UREG_I0]) {
0680             case ERESTARTNOHAND:
0681                 case ERESTARTSYS:
0682             case ERESTARTNOINTR:
0683                 /* replay the system call when we are done */
0684                 regs->u_regs[UREG_I0] = orig_i0;
0685                 regs->tpc -= 4;
0686                 regs->tnpc -= 4;
0687                 pt_regs_clear_syscall(regs);
0688                 fallthrough;
0689             case ERESTART_RESTARTBLOCK:
0690                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
0691                 regs->tpc -= 4;
0692                 regs->tnpc -= 4;
0693                 pt_regs_clear_syscall(regs);
0694             }
0695         }
0696         restore_saved_sigmask();
0697     }
0698 }
0699 
0700 struct sigstack32 {
0701     u32 the_stack;
0702     int cur_status;
0703 };
0704 
0705 asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
0706 {
0707     struct sigstack32 __user *ssptr =
0708         (struct sigstack32 __user *)((unsigned long)(u_ssptr));
0709     struct sigstack32 __user *ossptr =
0710         (struct sigstack32 __user *)((unsigned long)(u_ossptr));
0711     int ret = -EFAULT;
0712 
0713     /* First see if old state is wanted. */
0714     if (ossptr) {
0715         if (put_user(current->sas_ss_sp + current->sas_ss_size,
0716                  &ossptr->the_stack) ||
0717             __put_user(on_sig_stack(sp), &ossptr->cur_status))
0718             goto out;
0719     }
0720     
0721     /* Now see if we want to update the new state. */
0722     if (ssptr) {
0723         u32 ss_sp;
0724 
0725         if (get_user(ss_sp, &ssptr->the_stack))
0726             goto out;
0727 
0728         /* If the current stack was set with sigaltstack, don't
0729          * swap stacks while we are on it.
0730          */
0731         ret = -EPERM;
0732         if (current->sas_ss_sp && on_sig_stack(sp))
0733             goto out;
0734             
0735         /* Since we don't know the extent of the stack, and we don't
0736          * track onstack-ness, but rather calculate it, we must
0737          * presume a size.  Ho hum this interface is lossy.
0738          */
0739         current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
0740         current->sas_ss_size = SIGSTKSZ;
0741     }
0742     
0743     ret = 0;
0744 out:
0745     return ret;
0746 }
0747 
0748 /*
0749  * Compile-time assertions for siginfo_t offsets. Check NSIG* as well, as
0750  * changes likely come with new fields that should be added below.
0751  */
0752 static_assert(NSIGILL   == 11);
0753 static_assert(NSIGFPE   == 15);
0754 static_assert(NSIGSEGV  == 9);
0755 static_assert(NSIGBUS   == 5);
0756 static_assert(NSIGTRAP  == 6);
0757 static_assert(NSIGCHLD  == 6);
0758 static_assert(NSIGSYS   == 2);
0759 static_assert(sizeof(compat_siginfo_t) == 128);
0760 static_assert(__alignof__(compat_siginfo_t) == 4);
0761 static_assert(offsetof(compat_siginfo_t, si_signo)  == 0x00);
0762 static_assert(offsetof(compat_siginfo_t, si_errno)  == 0x04);
0763 static_assert(offsetof(compat_siginfo_t, si_code)   == 0x08);
0764 static_assert(offsetof(compat_siginfo_t, si_pid)    == 0x0c);
0765 static_assert(offsetof(compat_siginfo_t, si_uid)    == 0x10);
0766 static_assert(offsetof(compat_siginfo_t, si_tid)    == 0x0c);
0767 static_assert(offsetof(compat_siginfo_t, si_overrun)    == 0x10);
0768 static_assert(offsetof(compat_siginfo_t, si_status) == 0x14);
0769 static_assert(offsetof(compat_siginfo_t, si_utime)  == 0x18);
0770 static_assert(offsetof(compat_siginfo_t, si_stime)  == 0x1c);
0771 static_assert(offsetof(compat_siginfo_t, si_value)  == 0x14);
0772 static_assert(offsetof(compat_siginfo_t, si_int)    == 0x14);
0773 static_assert(offsetof(compat_siginfo_t, si_ptr)    == 0x14);
0774 static_assert(offsetof(compat_siginfo_t, si_addr)   == 0x0c);
0775 static_assert(offsetof(compat_siginfo_t, si_trapno) == 0x10);
0776 static_assert(offsetof(compat_siginfo_t, si_addr_lsb)   == 0x10);
0777 static_assert(offsetof(compat_siginfo_t, si_lower)  == 0x14);
0778 static_assert(offsetof(compat_siginfo_t, si_upper)  == 0x18);
0779 static_assert(offsetof(compat_siginfo_t, si_pkey)   == 0x14);
0780 static_assert(offsetof(compat_siginfo_t, si_perf_data)  == 0x10);
0781 static_assert(offsetof(compat_siginfo_t, si_perf_type)  == 0x14);
0782 static_assert(offsetof(compat_siginfo_t, si_perf_flags) == 0x18);
0783 static_assert(offsetof(compat_siginfo_t, si_band)   == 0x0c);
0784 static_assert(offsetof(compat_siginfo_t, si_fd)     == 0x10);
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