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-rw-r--r--arch/sparc/kernel/signal_64.c558
1 files changed, 558 insertions, 0 deletions
diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c
new file mode 100644
index 000000000..a0eec62c8
--- /dev/null
+++ b/arch/sparc/kernel/signal_64.c
@@ -0,0 +1,558 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/sparc64/kernel/signal.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
+ * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/tracehook.h>
+#include <linux/unistd.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/binfmts.h>
+#include <linux/bitops.h>
+#include <linux/context_tracking.h>
+
+#include <linux/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/fpumacro.h>
+#include <asm/uctx.h>
+#include <asm/siginfo.h>
+#include <asm/visasm.h>
+#include <asm/switch_to.h>
+#include <asm/cacheflush.h>
+
+#include "sigutil.h"
+#include "systbls.h"
+#include "kernel.h"
+#include "entry.h"
+
+/* {set, get}context() needed for 64-bit SparcLinux userland. */
+asmlinkage void sparc64_set_context(struct pt_regs *regs)
+{
+ struct ucontext __user *ucp = (struct ucontext __user *)
+ regs->u_regs[UREG_I0];
+ enum ctx_state prev_state = exception_enter();
+ mc_gregset_t __user *grp;
+ unsigned long pc, npc, tstate;
+ unsigned long fp, i7;
+ unsigned char fenab;
+ int err;
+
+ synchronize_user_stack();
+ if (get_thread_wsaved() ||
+ (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
+ (!__access_ok(ucp, sizeof(*ucp))))
+ goto do_sigsegv;
+ grp = &ucp->uc_mcontext.mc_gregs;
+ err = __get_user(pc, &((*grp)[MC_PC]));
+ err |= __get_user(npc, &((*grp)[MC_NPC]));
+ if (err || ((pc | npc) & 3))
+ goto do_sigsegv;
+ if (regs->u_regs[UREG_I1]) {
+ sigset_t set;
+
+ if (_NSIG_WORDS == 1) {
+ if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
+ goto do_sigsegv;
+ } else {
+ if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
+ goto do_sigsegv;
+ }
+ set_current_blocked(&set);
+ }
+ if (test_thread_flag(TIF_32BIT)) {
+ pc &= 0xffffffff;
+ npc &= 0xffffffff;
+ }
+ regs->tpc = pc;
+ regs->tnpc = npc;
+ err |= __get_user(regs->y, &((*grp)[MC_Y]));
+ err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
+ regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
+ regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
+ err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
+ err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
+ err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
+ err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
+ err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
+ err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
+
+ /* Skip %g7 as that's the thread register in userspace. */
+
+ err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
+ err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
+ err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
+ err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
+ err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
+ err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
+ err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
+ err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
+
+ err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
+ err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
+ err |= __put_user(fp,
+ (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
+ err |= __put_user(i7,
+ (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
+
+ err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
+ if (fenab) {
+ unsigned long *fpregs = current_thread_info()->fpregs;
+ unsigned long fprs;
+
+ fprs_write(0);
+ err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
+ if (fprs & FPRS_DL)
+ err |= copy_from_user(fpregs,
+ &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
+ (sizeof(unsigned int) * 32));
+ if (fprs & FPRS_DU)
+ err |= copy_from_user(fpregs+16,
+ ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
+ (sizeof(unsigned int) * 32));
+ err |= __get_user(current_thread_info()->xfsr[0],
+ &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
+ err |= __get_user(current_thread_info()->gsr[0],
+ &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
+ regs->tstate &= ~TSTATE_PEF;
+ }
+ if (err)
+ goto do_sigsegv;
+out:
+ exception_exit(prev_state);
+ return;
+do_sigsegv:
+ force_sig(SIGSEGV);
+ goto out;
+}
+
+asmlinkage void sparc64_get_context(struct pt_regs *regs)
+{
+ struct ucontext __user *ucp = (struct ucontext __user *)
+ regs->u_regs[UREG_I0];
+ enum ctx_state prev_state = exception_enter();
+ mc_gregset_t __user *grp;
+ mcontext_t __user *mcp;
+ unsigned long fp, i7;
+ unsigned char fenab;
+ int err;
+
+ synchronize_user_stack();
+ if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
+ goto do_sigsegv;
+
+#if 1
+ fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
+#else
+ fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
+#endif
+
+ mcp = &ucp->uc_mcontext;
+ grp = &mcp->mc_gregs;
+
+ /* Skip over the trap instruction, first. */
+ if (test_thread_flag(TIF_32BIT)) {
+ regs->tpc = (regs->tnpc & 0xffffffff);
+ regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
+ } else {
+ regs->tpc = regs->tnpc;
+ regs->tnpc += 4;
+ }
+ err = 0;
+ if (_NSIG_WORDS == 1)
+ err |= __put_user(current->blocked.sig[0],
+ (unsigned long __user *)&ucp->uc_sigmask);
+ else
+ err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
+ sizeof(sigset_t));
+
+ err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
+ err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
+ err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
+ err |= __put_user(regs->y, &((*grp)[MC_Y]));
+ err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
+ err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
+ err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
+ err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
+ err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
+ err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
+ err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
+ err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
+ err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
+ err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
+ err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
+ err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
+ err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
+ err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
+ err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
+
+ err |= __get_user(fp,
+ (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
+ err |= __get_user(i7,
+ (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
+ err |= __put_user(fp, &(mcp->mc_fp));
+ err |= __put_user(i7, &(mcp->mc_i7));
+
+ err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
+ if (fenab) {
+ unsigned long *fpregs = current_thread_info()->fpregs;
+ unsigned long fprs;
+
+ fprs = current_thread_info()->fpsaved[0];
+ if (fprs & FPRS_DL)
+ err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
+ (sizeof(unsigned int) * 32));
+ if (fprs & FPRS_DU)
+ err |= copy_to_user(
+ ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
+ (sizeof(unsigned int) * 32));
+ err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
+ err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
+ err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
+ }
+ if (err)
+ goto do_sigsegv;
+out:
+ exception_exit(prev_state);
+ return;
+do_sigsegv:
+ force_sig(SIGSEGV);
+ goto out;
+}
+
+/* Checks if the fp is valid. We always build rt signal frames which
+ * are 16-byte aligned, therefore we can always enforce that the
+ * restore frame has that property as well.
+ */
+static bool invalid_frame_pointer(void __user *fp)
+{
+ if (((unsigned long) fp) & 15)
+ return true;
+ return false;
+}
+
+struct rt_signal_frame {
+ struct sparc_stackf ss;
+ siginfo_t info;
+ struct pt_regs regs;
+ __siginfo_fpu_t __user *fpu_save;
+ stack_t stack;
+ sigset_t mask;
+ __siginfo_rwin_t *rwin_save;
+};
+
+void do_rt_sigreturn(struct pt_regs *regs)
+{
+ unsigned long tpc, tnpc, tstate, ufp;
+ struct rt_signal_frame __user *sf;
+ __siginfo_fpu_t __user *fpu_save;
+ __siginfo_rwin_t __user *rwin_save;
+ sigset_t set;
+ int err;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ current->restart_block.fn = do_no_restart_syscall;
+
+ synchronize_user_stack ();
+ sf = (struct rt_signal_frame __user *)
+ (regs->u_regs [UREG_FP] + STACK_BIAS);
+
+ /* 1. Make sure we are not getting garbage from the user */
+ if (invalid_frame_pointer(sf))
+ goto segv;
+
+ if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
+ goto segv;
+
+ if ((ufp + STACK_BIAS) & 0x7)
+ goto segv;
+
+ err = __get_user(tpc, &sf->regs.tpc);
+ err |= __get_user(tnpc, &sf->regs.tnpc);
+ if (test_thread_flag(TIF_32BIT)) {
+ tpc &= 0xffffffff;
+ tnpc &= 0xffffffff;
+ }
+ err |= ((tpc | tnpc) & 3);
+
+ /* 2. Restore the state */
+ err |= __get_user(regs->y, &sf->regs.y);
+ err |= __get_user(tstate, &sf->regs.tstate);
+ err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
+
+ /* User can only change condition codes and %asi in %tstate. */
+ regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
+ regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
+
+ err |= __get_user(fpu_save, &sf->fpu_save);
+ if (!err && fpu_save)
+ err |= restore_fpu_state(regs, fpu_save);
+
+ err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
+ err |= restore_altstack(&sf->stack);
+ if (err)
+ goto segv;
+
+ err |= __get_user(rwin_save, &sf->rwin_save);
+ if (!err && rwin_save) {
+ if (restore_rwin_state(rwin_save))
+ goto segv;
+ }
+
+ regs->tpc = tpc;
+ regs->tnpc = tnpc;
+
+ /* Prevent syscall restart. */
+ pt_regs_clear_syscall(regs);
+
+ set_current_blocked(&set);
+ return;
+segv:
+ force_sig(SIGSEGV);
+}
+
+static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
+{
+ unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
+
+ /*
+ * If we are on the alternate signal stack and would overflow it, don't.
+ * Return an always-bogus address instead so we will die with SIGSEGV.
+ */
+ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
+ return (void __user *) -1L;
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ sp = sigsp(sp, ksig) - framesize;
+
+ /* Always align the stack frame. This handles two cases. First,
+ * sigaltstack need not be mindful of platform specific stack
+ * alignment. Second, if we took this signal because the stack
+ * is not aligned properly, we'd like to take the signal cleanly
+ * and report that.
+ */
+ sp &= ~15UL;
+
+ return (void __user *) sp;
+}
+
+static inline int
+setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
+{
+ struct rt_signal_frame __user *sf;
+ int wsaved, err, sf_size;
+ void __user *tail;
+
+ /* 1. Make sure everything is clean */
+ synchronize_user_stack();
+ save_and_clear_fpu();
+
+ wsaved = get_thread_wsaved();
+
+ sf_size = sizeof(struct rt_signal_frame);
+ if (current_thread_info()->fpsaved[0] & FPRS_FEF)
+ sf_size += sizeof(__siginfo_fpu_t);
+ if (wsaved)
+ sf_size += sizeof(__siginfo_rwin_t);
+ sf = (struct rt_signal_frame __user *)
+ get_sigframe(ksig, regs, sf_size);
+
+ if (invalid_frame_pointer (sf)) {
+ if (show_unhandled_signals)
+ pr_info("%s[%d] bad frame in setup_rt_frame: %016lx TPC %016lx O7 %016lx\n",
+ current->comm, current->pid, (unsigned long)sf,
+ regs->tpc, regs->u_regs[UREG_I7]);
+ force_sigsegv(ksig->sig);
+ return -EINVAL;
+ }
+
+ tail = (sf + 1);
+
+ /* 2. Save the current process state */
+ err = copy_to_user(&sf->regs, regs, sizeof (*regs));
+
+ if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
+ __siginfo_fpu_t __user *fpu_save = tail;
+ tail += sizeof(__siginfo_fpu_t);
+ err |= save_fpu_state(regs, fpu_save);
+ err |= __put_user((u64)fpu_save, &sf->fpu_save);
+ } else {
+ err |= __put_user(0, &sf->fpu_save);
+ }
+ if (wsaved) {
+ __siginfo_rwin_t __user *rwin_save = tail;
+ tail += sizeof(__siginfo_rwin_t);
+ err |= save_rwin_state(wsaved, rwin_save);
+ err |= __put_user((u64)rwin_save, &sf->rwin_save);
+ set_thread_wsaved(0);
+ } else {
+ err |= __put_user(0, &sf->rwin_save);
+ }
+
+ /* Setup sigaltstack */
+ err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
+
+ err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
+
+ if (!wsaved) {
+ err |= copy_in_user((u64 __user *)sf,
+ (u64 __user *)(regs->u_regs[UREG_FP] +
+ STACK_BIAS),
+ sizeof(struct reg_window));
+ } else {
+ struct reg_window *rp;
+
+ rp = &current_thread_info()->reg_window[wsaved - 1];
+ err |= copy_to_user(sf, rp, sizeof(struct reg_window));
+ }
+ if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+ err |= copy_siginfo_to_user(&sf->info, &ksig->info);
+ else {
+ err |= __put_user(ksig->sig, &sf->info.si_signo);
+ err |= __put_user(SI_NOINFO, &sf->info.si_code);
+ }
+ if (err)
+ return err;
+
+ /* 3. signal handler back-trampoline and parameters */
+ regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
+ regs->u_regs[UREG_I0] = ksig->sig;
+ regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
+
+ /* The sigcontext is passed in this way because of how it
+ * is defined in GLIBC's /usr/include/bits/sigcontext.h
+ * for sparc64. It includes the 128 bytes of siginfo_t.
+ */
+ regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
+
+ /* 5. signal handler */
+ regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
+ regs->tnpc = (regs->tpc + 4);
+ if (test_thread_flag(TIF_32BIT)) {
+ regs->tpc &= 0xffffffff;
+ regs->tnpc &= 0xffffffff;
+ }
+ /* 4. return to kernel instructions */
+ regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
+ return 0;
+}
+
+static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
+ struct sigaction *sa)
+{
+ switch (regs->u_regs[UREG_I0]) {
+ case ERESTART_RESTARTBLOCK:
+ case ERESTARTNOHAND:
+ no_system_call_restart:
+ regs->u_regs[UREG_I0] = EINTR;
+ regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
+ break;
+ case ERESTARTSYS:
+ if (!(sa->sa_flags & SA_RESTART))
+ goto no_system_call_restart;
+ fallthrough;
+ case ERESTARTNOINTR:
+ regs->u_regs[UREG_I0] = orig_i0;
+ regs->tpc -= 4;
+ regs->tnpc -= 4;
+ }
+}
+
+/* Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ */
+static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
+{
+ struct ksignal ksig;
+ int restart_syscall;
+ bool has_handler;
+
+ /* It's a lot of work and synchronization to add a new ptrace
+ * register for GDB to save and restore in order to get
+ * orig_i0 correct for syscall restarts when debugging.
+ *
+ * Although it should be the case that most of the global
+ * registers are volatile across a system call, glibc already
+ * depends upon that fact that we preserve them. So we can't
+ * just use any global register to save away the orig_i0 value.
+ *
+ * In particular %g2, %g3, %g4, and %g5 are all assumed to be
+ * preserved across a system call trap by various pieces of
+ * code in glibc.
+ *
+ * %g7 is used as the "thread register". %g6 is not used in
+ * any fixed manner. %g6 is used as a scratch register and
+ * a compiler temporary, but it's value is never used across
+ * a system call. Therefore %g6 is usable for orig_i0 storage.
+ */
+ if (pt_regs_is_syscall(regs) &&
+ (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
+ regs->u_regs[UREG_G6] = orig_i0;
+
+#ifdef CONFIG_COMPAT
+ if (test_thread_flag(TIF_32BIT)) {
+ do_signal32(regs);
+ return;
+ }
+#endif
+
+ has_handler = get_signal(&ksig);
+
+ restart_syscall = 0;
+ if (pt_regs_is_syscall(regs) &&
+ (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
+ restart_syscall = 1;
+ orig_i0 = regs->u_regs[UREG_G6];
+ }
+
+ if (has_handler) {
+ if (restart_syscall)
+ syscall_restart(orig_i0, regs, &ksig.ka.sa);
+ signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
+ } else {
+ if (restart_syscall) {
+ switch (regs->u_regs[UREG_I0]) {
+ case ERESTARTNOHAND:
+ case ERESTARTSYS:
+ case ERESTARTNOINTR:
+ /* replay the system call when we are done */
+ regs->u_regs[UREG_I0] = orig_i0;
+ regs->tpc -= 4;
+ regs->tnpc -= 4;
+ pt_regs_clear_syscall(regs);
+ fallthrough;
+ case ERESTART_RESTARTBLOCK:
+ regs->u_regs[UREG_G1] = __NR_restart_syscall;
+ regs->tpc -= 4;
+ regs->tnpc -= 4;
+ pt_regs_clear_syscall(regs);
+ }
+ }
+ restore_saved_sigmask();
+ }
+}
+
+void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
+{
+ user_exit();
+ if (thread_info_flags & _TIF_UPROBE)
+ uprobe_notify_resume(regs);
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
+ do_signal(regs, orig_i0);
+ if (thread_info_flags & _TIF_NOTIFY_RESUME)
+ tracehook_notify_resume(regs);
+ user_enter();
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 16:38:22 +0000