Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
new file mode 100644
index 0000000..508026a
--- /dev/null
+++ b/arch/mips/kernel/signal.c
@@ -0,0 +1,517 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 1994 - 2000 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/personality.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/compiler.h>
+
+#include <asm/asm.h>
+#include <linux/bitops.h>
+#include <asm/cacheflush.h>
+#include <asm/fpu.h>
+#include <asm/sim.h>
+#include <asm/uaccess.h>
+#include <asm/ucontext.h>
+#include <asm/cpu-features.h>
+
+#include "signal-common.h"
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+static int do_signal(sigset_t *oldset, struct pt_regs *regs);
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+
+#ifdef CONFIG_TRAD_SIGNALS
+save_static_function(sys_sigsuspend);
+__attribute_used__ noinline static int
+_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
+{
+ sigset_t *uset, saveset, newset;
+
+ uset = (sigset_t *) regs.regs[4];
+ if (copy_from_user(&newset, uset, sizeof(sigset_t)))
+ return -EFAULT;
+ sigdelsetmask(&newset, ~_BLOCKABLE);
+
+ spin_lock_irq(¤t->sighand->siglock);
+ saveset = current->blocked;
+ current->blocked = newset;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ regs.regs[2] = EINTR;
+ regs.regs[7] = 1;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ if (do_signal(&saveset, ®s))
+ return -EINTR;
+ }
+}
+#endif
+
+save_static_function(sys_rt_sigsuspend);
+__attribute_used__ noinline static int
+_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
+{
+ sigset_t *unewset, saveset, newset;
+ size_t sigsetsize;
+
+ /* XXX Don't preclude handling different sized sigset_t's. */
+ sigsetsize = regs.regs[5];
+ if (sigsetsize != sizeof(sigset_t))
+ return -EINVAL;
+
+ unewset = (sigset_t *) regs.regs[4];
+ if (copy_from_user(&newset, unewset, sizeof(newset)))
+ return -EFAULT;
+ sigdelsetmask(&newset, ~_BLOCKABLE);
+
+ spin_lock_irq(¤t->sighand->siglock);
+ saveset = current->blocked;
+ current->blocked = newset;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ regs.regs[2] = EINTR;
+ regs.regs[7] = 1;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ if (do_signal(&saveset, ®s))
+ return -EINTR;
+ }
+}
+
+#ifdef CONFIG_TRAD_SIGNALS
+asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
+ struct sigaction *oact)
+{
+ struct k_sigaction new_ka, old_ka;
+ int ret;
+ int err = 0;
+
+ if (act) {
+ old_sigset_t mask;
+
+ if (!access_ok(VERIFY_READ, act, sizeof(*act)))
+ return -EFAULT;
+ err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
+ err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+ err |= __get_user(mask, &act->sa_mask.sig[0]);
+ if (err)
+ return -EFAULT;
+
+ siginitset(&new_ka.sa.sa_mask, mask);
+ }
+
+ ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+ if (!ret && oact) {
+ if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
+ return -EFAULT;
+ err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+ err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
+ err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
+ err |= __put_user(0, &oact->sa_mask.sig[1]);
+ err |= __put_user(0, &oact->sa_mask.sig[2]);
+ err |= __put_user(0, &oact->sa_mask.sig[3]);
+ if (err)
+ return -EFAULT;
+ }
+
+ return ret;
+}
+#endif
+
+asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
+{
+ const stack_t *uss = (const stack_t *) regs.regs[4];
+ stack_t *uoss = (stack_t *) regs.regs[5];
+ unsigned long usp = regs.regs[29];
+
+ return do_sigaltstack(uss, uoss, usp);
+}
+
+#if PLAT_TRAMPOLINE_STUFF_LINE
+#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
+#else
+#define __tramp
+#endif
+
+#ifdef CONFIG_TRAD_SIGNALS
+struct sigframe {
+ u32 sf_ass[4]; /* argument save space for o32 */
+ u32 sf_code[2] __tramp; /* signal trampoline */
+ struct sigcontext sf_sc __tramp;
+ sigset_t sf_mask;
+};
+#endif
+
+struct rt_sigframe {
+ u32 rs_ass[4]; /* argument save space for o32 */
+ u32 rs_code[2] __tramp; /* signal trampoline */
+ struct siginfo rs_info __tramp;
+ struct ucontext rs_uc;
+};
+
+#ifdef CONFIG_TRAD_SIGNALS
+save_static_function(sys_sigreturn);
+__attribute_used__ noinline static void
+_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
+{
+ struct sigframe *frame;
+ sigset_t blocked;
+
+ frame = (struct sigframe *) regs.regs[29];
+ if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+ if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
+ goto badframe;
+
+ sigdelsetmask(&blocked, ~_BLOCKABLE);
+ spin_lock_irq(¤t->sighand->siglock);
+ current->blocked = blocked;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ if (restore_sigcontext(®s, &frame->sf_sc))
+ goto badframe;
+
+ /*
+ * Don't let your children do this ...
+ */
+ if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
+ do_syscall_trace(®s, 1);
+ __asm__ __volatile__(
+ "move\t$29, %0\n\t"
+ "j\tsyscall_exit"
+ :/* no outputs */
+ :"r" (®s));
+ /* Unreached */
+
+badframe:
+ force_sig(SIGSEGV, current);
+}
+#endif
+
+save_static_function(sys_rt_sigreturn);
+__attribute_used__ noinline static void
+_sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
+{
+ struct rt_sigframe *frame;
+ sigset_t set;
+ stack_t st;
+
+ frame = (struct rt_sigframe *) regs.regs[29];
+ if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+ if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
+ goto badframe;
+
+ sigdelsetmask(&set, ~_BLOCKABLE);
+ spin_lock_irq(¤t->sighand->siglock);
+ current->blocked = set;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
+ goto badframe;
+
+ if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
+ goto badframe;
+ /* It is more difficult to avoid calling this function than to
+ call it and ignore errors. */
+ do_sigaltstack(&st, NULL, regs.regs[29]);
+
+ /*
+ * Don't let your children do this ...
+ */
+ __asm__ __volatile__(
+ "move\t$29, %0\n\t"
+ "j\tsyscall_exit"
+ :/* no outputs */
+ :"r" (®s));
+ /* Unreached */
+
+badframe:
+ force_sig(SIGSEGV, current);
+}
+
+#ifdef CONFIG_TRAD_SIGNALS
+static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+ int signr, sigset_t *set)
+{
+ struct sigframe *frame;
+ int err = 0;
+
+ frame = get_sigframe(ka, regs, sizeof(*frame));
+ if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
+ goto give_sigsegv;
+
+ /*
+ * Set up the return code ...
+ *
+ * li v0, __NR_sigreturn
+ * syscall
+ */
+ if (PLAT_TRAMPOLINE_STUFF_LINE)
+ __clear_user(frame->sf_code, PLAT_TRAMPOLINE_STUFF_LINE);
+ err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
+ err |= __put_user(0x0000000c , frame->sf_code + 1);
+ flush_cache_sigtramp((unsigned long) frame->sf_code);
+
+ err |= setup_sigcontext(regs, &frame->sf_sc);
+ err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
+ if (err)
+ goto give_sigsegv;
+
+ /*
+ * Arguments to signal handler:
+ *
+ * a0 = signal number
+ * a1 = 0 (should be cause)
+ * a2 = pointer to struct sigcontext
+ *
+ * $25 and c0_epc point to the signal handler, $29 points to the
+ * struct sigframe.
+ */
+ regs->regs[ 4] = signr;
+ regs->regs[ 5] = 0;
+ regs->regs[ 6] = (unsigned long) &frame->sf_sc;
+ regs->regs[29] = (unsigned long) frame;
+ regs->regs[31] = (unsigned long) frame->sf_code;
+ regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
+
+#if DEBUG_SIG
+ printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
+ current->comm, current->pid,
+ frame, regs->cp0_epc, frame->regs[31]);
+#endif
+ return;
+
+give_sigsegv:
+ force_sigsegv(signr, current);
+}
+#endif
+
+static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
+ int signr, sigset_t *set, siginfo_t *info)
+{
+ struct rt_sigframe *frame;
+ int err = 0;
+
+ frame = get_sigframe(ka, regs, sizeof(*frame));
+ if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
+ goto give_sigsegv;
+
+ /*
+ * Set up the return code ...
+ *
+ * li v0, __NR_rt_sigreturn
+ * syscall
+ */
+ if (PLAT_TRAMPOLINE_STUFF_LINE)
+ __clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
+ err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
+ err |= __put_user(0x0000000c , frame->rs_code + 1);
+ flush_cache_sigtramp((unsigned long) frame->rs_code);
+
+ /* Create siginfo. */
+ err |= copy_siginfo_to_user(&frame->rs_info, info);
+
+ /* Create the ucontext. */
+ err |= __put_user(0, &frame->rs_uc.uc_flags);
+ err |= __put_user(0, &frame->rs_uc.uc_link);
+ err |= __put_user((void *)current->sas_ss_sp,
+ &frame->rs_uc.uc_stack.ss_sp);
+ err |= __put_user(sas_ss_flags(regs->regs[29]),
+ &frame->rs_uc.uc_stack.ss_flags);
+ err |= __put_user(current->sas_ss_size,
+ &frame->rs_uc.uc_stack.ss_size);
+ err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+ err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+
+ if (err)
+ goto give_sigsegv;
+
+ /*
+ * Arguments to signal handler:
+ *
+ * a0 = signal number
+ * a1 = 0 (should be cause)
+ * a2 = pointer to ucontext
+ *
+ * $25 and c0_epc point to the signal handler, $29 points to
+ * the struct rt_sigframe.
+ */
+ regs->regs[ 4] = signr;
+ regs->regs[ 5] = (unsigned long) &frame->rs_info;
+ regs->regs[ 6] = (unsigned long) &frame->rs_uc;
+ regs->regs[29] = (unsigned long) frame;
+ regs->regs[31] = (unsigned long) frame->rs_code;
+ regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
+
+#if DEBUG_SIG
+ printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
+ current->comm, current->pid,
+ frame, regs->cp0_epc, regs->regs[31]);
+#endif
+ return;
+
+give_sigsegv:
+ force_sigsegv(signr, current);
+}
+
+extern void setup_rt_frame_n32(struct k_sigaction * ka,
+ struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
+
+static inline void handle_signal(unsigned long sig, siginfo_t *info,
+ struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
+{
+ switch(regs->regs[0]) {
+ case ERESTART_RESTARTBLOCK:
+ case ERESTARTNOHAND:
+ regs->regs[2] = EINTR;
+ break;
+ case ERESTARTSYS:
+ if(!(ka->sa.sa_flags & SA_RESTART)) {
+ regs->regs[2] = EINTR;
+ break;
+ }
+ /* fallthrough */
+ case ERESTARTNOINTR: /* Userland will reload $v0. */
+ regs->regs[7] = regs->regs[26];
+ regs->cp0_epc -= 8;
+ }
+
+ regs->regs[0] = 0; /* Don't deal with this again. */
+
+#ifdef CONFIG_TRAD_SIGNALS
+ if (ka->sa.sa_flags & SA_SIGINFO) {
+#else
+ if (1) {
+#endif
+#ifdef CONFIG_MIPS32_N32
+ if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
+ setup_rt_frame_n32 (ka, regs, sig, oldset, info);
+ else
+#endif
+ setup_rt_frame(ka, regs, sig, oldset, info);
+ }
+#ifdef CONFIG_TRAD_SIGNALS
+ else
+ setup_frame(ka, regs, sig, oldset);
+#endif
+
+ if (!(ka->sa.sa_flags & SA_NODEFER)) {
+ spin_lock_irq(¤t->sighand->siglock);
+ sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
+ sigaddset(¤t->blocked,sig);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+ }
+}
+
+extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
+extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
+
+static int do_signal(sigset_t *oldset, struct pt_regs *regs)
+{
+ struct k_sigaction ka;
+ siginfo_t info;
+ int signr;
+
+#ifdef CONFIG_BINFMT_ELF32
+ if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
+ return do_signal32(oldset, regs);
+ }
+#endif
+
+ /*
+ * We want the common case to go fast, which is why we may in certain
+ * cases get here from kernel mode. Just return without doing anything
+ * if so.
+ */
+ if (!user_mode(regs))
+ return 1;
+
+ if (try_to_freeze(0))
+ goto no_signal;
+
+ if (!oldset)
+ oldset = ¤t->blocked;
+
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ if (signr > 0) {
+ handle_signal(signr, &info, &ka, oldset, regs);
+ return 1;
+ }
+
+no_signal:
+ /*
+ * Who's code doesn't conform to the restartable syscall convention
+ * dies here!!! The li instruction, a single machine instruction,
+ * must directly be followed by the syscall instruction.
+ */
+ if (regs->regs[0]) {
+ if (regs->regs[2] == ERESTARTNOHAND ||
+ regs->regs[2] == ERESTARTSYS ||
+ regs->regs[2] == ERESTARTNOINTR) {
+ regs->regs[7] = regs->regs[26];
+ regs->cp0_epc -= 8;
+ }
+ if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
+ regs->regs[2] = __NR_restart_syscall;
+ regs->regs[7] = regs->regs[26];
+ regs->cp0_epc -= 4;
+ }
+ }
+ return 0;
+}
+
+/*
+ * notification of userspace execution resumption
+ * - triggered by current->work.notify_resume
+ */
+asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
+ __u32 thread_info_flags)
+{
+ /* deal with pending signal delivery */
+ if (thread_info_flags & _TIF_SIGPENDING) {
+#ifdef CONFIG_BINFMT_ELF32
+ if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
+ do_signal32(oldset, regs);
+ return;
+ }
+#endif
+#ifdef CONFIG_BINFMT_IRIX
+ if (unlikely(current->personality != PER_LINUX)) {
+ do_irix_signal(oldset, regs);
+ return;
+ }
+#endif
+ do_signal(oldset, regs);
+ }
+}