>From 0ba2890dbe62d88e267316c6fec5738f7fbc2b18 Mon Sep 17 00:00:00 2001
From: Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
Date: Wed, 26 Aug 2009 10:05:09 +0800
Subject: [PATCH 27/33] score: create kernel/ files ptrace.c signal.c
Signed-off-by: Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
---
arch/score/kernel/ptrace.c | 382 ++++++++++++++++++++++++++++++++++++++++++++
arch/score/kernel/signal.c | 361 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 743 insertions(+), 0 deletions(-)
create mode 100644 arch/score/kernel/ptrace.c
create mode 100644 arch/score/kernel/signal.c
diff --git a/arch/score/kernel/ptrace.c b/arch/score/kernel/ptrace.c
new file mode 100644
index 0000000..174c642
--- /dev/null
+++ b/arch/score/kernel/ptrace.c
@@ -0,0 +1,382 @@
+/*
+ * arch/score/kernel/ptrace.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
+ * Lennox Wu <lennox.wu@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/elf.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/ptrace.h>
+#include <linux/regset.h>
+
+#include <asm/uaccess.h>
+
+/*
+ * retrieve the contents of SCORE userspace general registers
+ */
+static int genregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ /* skip 9 * sizeof(unsigned long) not use for pt_regs */
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ 0, offsetof(struct pt_regs, regs));
+
+ /* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
+ ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+ regs->regs,
+ offsetof(struct pt_regs, regs),
+ offsetof(struct pt_regs, cp0_condition));
+
+ if (!ret)
+ ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+ sizeof(struct pt_regs), -1);
+
+ return ret;
+}
+
+/*
+ * update the contents of the SCORE userspace general registers
+ */
+static int genregs_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ int ret;
+
+ /* skip 9 * sizeof(unsigned long) */
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ 0, offsetof(struct pt_regs, regs));
+
+ /* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+ regs->regs,
+ offsetof(struct pt_regs, regs),
+ offsetof(struct pt_regs, cp0_condition));
+
+ if (!ret)
+ ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+ sizeof(struct pt_regs), -1);
+
+ return ret;
+}
+
+/*
+ * Define the register sets available on the score7 under Linux
+ */
+enum score7_regset {
+ REGSET_GENERAL,
+};
+
+static const struct user_regset score7_regsets[] = {
+ [REGSET_GENERAL] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .get = genregs_get,
+ .set = genregs_set,
+ },
+};
+
+static const struct user_regset_view user_score_native_view = {
+ .name = "score7",
+ .e_machine = EM_SCORE7,
+ .regsets = score7_regsets,
+ .n = ARRAY_SIZE(score7_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+ return &user_score_native_view;
+}
+
+static int is_16bitinsn(unsigned long insn)
+{
+ if ((insn & INSN32_MASK) == INSN32_MASK)
+ return 0;
+ else
+ return 1;
+}
+
+int
+read_tsk_long(struct task_struct *child,
+ unsigned long addr, unsigned long *res)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, res, sizeof(*res), 0);
+
+ return copied != sizeof(*res) ? -EIO : 0;
+}
+
+int
+read_tsk_short(struct task_struct *child,
+ unsigned long addr, unsigned short *res)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, res, sizeof(*res), 0);
+
+ return copied != sizeof(*res) ? -EIO : 0;
+}
+
+static int
+write_tsk_short(struct task_struct *child,
+ unsigned long addr, unsigned short val)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, &val, sizeof(val), 1);
+
+ return copied != sizeof(val) ? -EIO : 0;
+}
+
+static int
+write_tsk_long(struct task_struct *child,
+ unsigned long addr, unsigned long val)
+{
+ int copied;
+
+ copied = access_process_vm(child, addr, &val, sizeof(val), 1);
+
+ return copied != sizeof(val) ? -EIO : 0;
+}
+
+void user_enable_single_step(struct task_struct *child)
+{
+ /* far_epc is the target of branch */
+ unsigned int epc, far_epc = 0;
+ unsigned long epc_insn, far_epc_insn;
+ int ninsn_type; /* next insn type 0=16b, 1=32b */
+ unsigned int tmp, tmp2;
+ struct pt_regs *regs = task_pt_regs(child);
+ child->thread.single_step = 1;
+ child->thread.ss_nextcnt = 1;
+ epc = regs->cp0_epc;
+
+ read_tsk_long(child, epc, &epc_insn);
+
+ if (is_16bitinsn(epc_insn)) {
+ if ((epc_insn & J16M) == J16) {
+ tmp = epc_insn & 0xFFE;
+ epc = (epc & 0xFFFFF000) | tmp;
+ } else if ((epc_insn & B16M) == B16) {
+ child->thread.ss_nextcnt = 2;
+ tmp = (epc_insn & 0xFF) << 1;
+ tmp = tmp << 23;
+ tmp = (unsigned int)((int) tmp >> 23);
+ far_epc = epc + tmp;
+ epc += 2;
+ } else if ((epc_insn & BR16M) == BR16) {
+ child->thread.ss_nextcnt = 2;
+ tmp = (epc_insn >> 4) & 0xF;
+ far_epc = regs->regs[tmp];
+ epc += 2;
+ } else
+ epc += 2;
+ } else {
+ if ((epc_insn & J32M) == J32) {
+ tmp = epc_insn & 0x03FFFFFE;
+ tmp2 = tmp & 0x7FFF;
+ tmp = (((tmp >> 16) & 0x3FF) << 15) | tmp2;
+ epc = (epc & 0xFFC00000) | tmp;
+ } else if ((epc_insn & B32M) == B32) {
+ child->thread.ss_nextcnt = 2;
+ tmp = epc_insn & 0x03FFFFFE; /* discard LK bit */
+ tmp2 = tmp & 0x3FF;
+ tmp = (((tmp >> 16) & 0x3FF) << 10) | tmp2; /* 20bit */
+ tmp = tmp << 12;
+ tmp = (unsigned int)((int) tmp >> 12);
+ far_epc = epc + tmp;
+ epc += 4;
+ } else if ((epc_insn & BR32M) == BR32) {
+ child->thread.ss_nextcnt = 2;
+ tmp = (epc_insn >> 16) & 0x1F;
+ far_epc = regs->regs[tmp];
+ epc += 4;
+ } else
+ epc += 4;
+ }
+
+ if (child->thread.ss_nextcnt == 1) {
+ read_tsk_long(child, epc, &epc_insn);
+
+ if (is_16bitinsn(epc_insn)) {
+ write_tsk_short(child, epc, SINGLESTEP16_INSN);
+ ninsn_type = 0;
+ } else {
+ write_tsk_long(child, epc, SINGLESTEP32_INSN);
+ ninsn_type = 1;
+ }
+
+ if (ninsn_type == 0) { /* 16bits */
+ child->thread.insn1_type = 0;
+ child->thread.addr1 = epc;
+ /* the insn may have 32bit data */
+ child->thread.insn1 = (short)epc_insn;
+ } else {
+ child->thread.insn1_type = 1;
+ child->thread.addr1 = epc;
+ child->thread.insn1 = epc_insn;
+ }
+ } else {
+ /* branch! have two target child->thread.ss_nextcnt=2 */
+ read_tsk_long(child, epc, &epc_insn);
+ read_tsk_long(child, far_epc, &far_epc_insn);
+ if (is_16bitinsn(epc_insn)) {
+ write_tsk_short(child, epc, SINGLESTEP16_INSN);
+ ninsn_type = 0;
+ } else {
+ write_tsk_long(child, epc, SINGLESTEP32_INSN);
+ ninsn_type = 1;
+ }
+
+ if (ninsn_type == 0) { /* 16bits */
+ child->thread.insn1_type = 0;
+ child->thread.addr1 = epc;
+ /* the insn may have 32bit data */
+ child->thread.insn1 = (short)epc_insn;
+ } else {
+ child->thread.insn1_type = 1;
+ child->thread.addr1 = epc;
+ child->thread.insn1 = epc_insn;
+ }
+
+ if (is_16bitinsn(far_epc_insn)) {
+ write_tsk_short(child, far_epc, SINGLESTEP16_INSN);
+ ninsn_type = 0;
+ } else {
+ write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
+ ninsn_type = 1;
+ }
+
+ if (ninsn_type == 0) { /* 16bits */
+ child->thread.insn2_type = 0;
+ child->thread.addr2 = far_epc;
+ /* the insn may have 32bit data */
+ child->thread.insn2 = (short)far_epc_insn;
+ } else {
+ child->thread.insn2_type = 1;
+ child->thread.addr2 = far_epc;
+ child->thread.insn2 = far_epc_insn;
+ }
+ }
+}
+
+void user_disable_single_step(struct task_struct *child)
+{
+ if (child->thread.insn1_type == 0)
+ write_tsk_short(child, child->thread.addr1,
+ child->thread.insn1);
+
+ if (child->thread.insn1_type == 1)
+ write_tsk_long(child, child->thread.addr1,
+ child->thread.insn1);
+
+ if (child->thread.ss_nextcnt == 2) { /* branch */
+ if (child->thread.insn1_type == 0)
+ write_tsk_short(child, child->thread.addr1,
+ child->thread.insn1);
+ if (child->thread.insn1_type == 1)
+ write_tsk_long(child, child->thread.addr1,
+ child->thread.insn1);
+ if (child->thread.insn2_type == 0)
+ write_tsk_short(child, child->thread.addr2,
+ child->thread.insn2);
+ if (child->thread.insn2_type == 1)
+ write_tsk_long(child, child->thread.addr2,
+ child->thread.insn2);
+ }
+
+ child->thread.single_step = 0;
+ child->thread.ss_nextcnt = 0;
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+ user_disable_single_step(child);
+}
+
+long
+arch_ptrace(struct task_struct *child, long request, long addr, long data)
+{
+ int ret;
+ unsigned long __user *datap = (void __user *)data;
+
+ switch (request) {
+ case PTRACE_GETREGS:
+ ret = copy_regset_to_user(child, &user_score_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(struct pt_regs),
+ (void __user *)datap);
+ break;
+
+ case PTRACE_SETREGS:
+ ret = copy_regset_from_user(child, &user_score_native_view,
+ REGSET_GENERAL,
+ 0, sizeof(struct pt_regs),
+ (const void __user *)datap);
+ break;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * Notification of system call entry/exit
+ * - triggered by current->work.syscall_trace
+ */
+asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
+{
+ if (!(current->ptrace & PT_PTRACED))
+ return;
+
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+
+ /* The 0x80 provides a way for the tracing parent to distinguish
+ between a syscall stop and SIGTRAP delivery. */
+ ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
+ 0x80 : 0));
+
+ /*
+ * this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
diff --git a/arch/score/kernel/signal.c b/arch/score/kernel/signal.c
new file mode 100644
index 0000000..950f87c
--- /dev/null
+++ b/arch/score/kernel/signal.c
@@ -0,0 +1,361 @@
+/*
+ * arch/score/kernel/signal.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@xxxxxxxxxxxxx>
+ * Lennox Wu <lennox.wu@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/unistd.h>
+#include <linux/uaccess.h>
+
+#include <asm/syscalls.h>
+#include <asm/ucontext.h>
+
+#include <asm/cacheflush.h>
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+struct rt_sigframe {
+ u32 rs_ass[4]; /* argument save space */
+ u32 rs_code[2]; /* signal trampoline */
+ struct siginfo rs_info;
+ struct ucontext rs_uc;
+};
+
+static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+ int err = 0;
+ unsigned long reg;
+
+ reg = regs->cp0_epc; err |= __put_user(reg, &sc->sc_pc);
+ err |= __put_user(regs->cp0_psr, &sc->sc_psr);
+ err |= __put_user(regs->cp0_condition, &sc->sc_condition);
+
+
+#define save_gp_reg(i) { \
+ reg = regs->regs[i]; \
+ err |= __put_user(reg, &sc->sc_regs[i]); \
+} while (0)
+ save_gp_reg(0); save_gp_reg(1); save_gp_reg(2);
+ save_gp_reg(3); save_gp_reg(4); save_gp_reg(5);
+ save_gp_reg(6); save_gp_reg(7); save_gp_reg(8);
+ save_gp_reg(9); save_gp_reg(10); save_gp_reg(11);
+ save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
+ save_gp_reg(15); save_gp_reg(16); save_gp_reg(17);
+ save_gp_reg(18); save_gp_reg(19); save_gp_reg(20);
+ save_gp_reg(21); save_gp_reg(22); save_gp_reg(23);
+ save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
+ save_gp_reg(27); save_gp_reg(28); save_gp_reg(29);
+#undef save_gp_reg
+
+ reg = regs->ceh; err |= __put_user(reg, &sc->sc_mdceh);
+ reg = regs->cel; err |= __put_user(reg, &sc->sc_mdcel);
+ err |= __put_user(regs->cp0_ecr, &sc->sc_ecr);
+ err |= __put_user(regs->cp0_ema, &sc->sc_ema);
+
+ return err;
+}
+
+static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+ int err = 0;
+ u32 reg;
+
+ err |= __get_user(regs->cp0_epc, &sc->sc_pc);
+ err |= __get_user(regs->cp0_condition, &sc->sc_condition);
+
+ err |= __get_user(reg, &sc->sc_mdceh);
+ regs->ceh = (int) reg;
+ err |= __get_user(reg, &sc->sc_mdcel);
+ regs->cel = (int) reg;
+
+ err |= __get_user(reg, &sc->sc_psr);
+ regs->cp0_psr = (int) reg;
+ err |= __get_user(reg, &sc->sc_ecr);
+ regs->cp0_ecr = (int) reg;
+ err |= __get_user(reg, &sc->sc_ema);
+ regs->cp0_ema = (int) reg;
+
+#define restore_gp_reg(i) do { \
+ err |= __get_user(reg, &sc->sc_regs[i]); \
+ regs->regs[i] = reg; \
+} while (0)
+ restore_gp_reg(0); restore_gp_reg(1); restore_gp_reg(2);
+ restore_gp_reg(3); restore_gp_reg(4); restore_gp_reg(5);
+ restore_gp_reg(6); restore_gp_reg(7); restore_gp_reg(8);
+ restore_gp_reg(9); restore_gp_reg(10); restore_gp_reg(11);
+ restore_gp_reg(12); restore_gp_reg(13); restore_gp_reg(14);
+ restore_gp_reg(15); restore_gp_reg(16); restore_gp_reg(17);
+ restore_gp_reg(18); restore_gp_reg(19); restore_gp_reg(20);
+ restore_gp_reg(21); restore_gp_reg(22); restore_gp_reg(23);
+ restore_gp_reg(24); restore_gp_reg(25); restore_gp_reg(26);
+ restore_gp_reg(27); restore_gp_reg(28); restore_gp_reg(29);
+#undef restore_gp_reg
+
+ return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+static void __user *get_sigframe(struct k_sigaction *ka,
+ struct pt_regs *regs, size_t frame_size)
+{
+ unsigned long sp;
+
+ /* Default to using normal stack */
+ sp = regs->regs[0];
+ sp -= 32;
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ if ((ka->sa.sa_flags & SA_ONSTACK) && (!on_sig_stack(sp)))
+ sp = current->sas_ss_sp + current->sas_ss_size;
+
+ return (void __user*)((sp - frame_size) & ~7);
+}
+
+asmlinkage long
+score_sigaltstack(struct pt_regs *regs)
+{
+ const stack_t __user *uss = (const stack_t __user *) regs->regs[4];
+ stack_t __user *uoss = (stack_t __user *) regs->regs[5];
+ unsigned long usp = regs->regs[0];
+
+ return do_sigaltstack(uss, uoss, usp);
+}
+
+asmlinkage long
+score_rt_sigreturn(struct pt_regs *regs)
+{
+ struct rt_sigframe __user *frame;
+ sigset_t set;
+ stack_t st;
+ int sig;
+
+ frame = (struct rt_sigframe __user *) regs->regs[0];
+ 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);
+
+ sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+ if (sig < 0)
+ goto badframe;
+ else if (sig)
+ force_sig(sig, current);
+
+ 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((stack_t __user *)&st, NULL, regs->regs[0]);
+
+ __asm__ __volatile__(
+ "mv\tr0, %0\n\t"
+ "la\tr8, syscall_exit\n\t"
+ "br\tr8\n\t"
+ : : "r" (regs) : "r8");
+
+badframe:
+ force_sig(SIGSEGV, current);
+
+ return 0;
+}
+
+static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
+ int signr, sigset_t *set, siginfo_t *info)
+{
+ struct rt_sigframe __user *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
+ */
+ err |= __put_user(0x87788000 + __NR_rt_sigreturn*2,
+ frame->rs_code + 0);
+ err |= __put_user(0x80008002, frame->rs_code + 1);
+ flush_cache_sigtramp((unsigned long) frame->rs_code);
+
+ err |= copy_siginfo_to_user(&frame->rs_info, info);
+ err |= __put_user(0, &frame->rs_uc.uc_flags);
+ err |= __put_user(NULL, &frame->rs_uc.uc_link);
+ err |= __put_user((void __user *)current->sas_ss_sp,
+ &frame->rs_uc.uc_stack.ss_sp);
+ err |= __put_user(sas_ss_flags(regs->regs[0]),
+ &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;
+
+ regs->regs[0] = (unsigned long) frame;
+ regs->regs[3] = (unsigned long) frame->rs_code;
+ 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) ka->sa.sa_handler;
+ regs->cp0_epc = (unsigned long) ka->sa.sa_handler;
+
+ return 0;
+
+give_sigsegv:
+ if (signr == SIGSEGV)
+ ka->sa.sa_handler = SIG_DFL;
+ force_sig(SIGSEGV, current);
+ return -EFAULT;
+}
+
+static int handle_signal(unsigned long sig, siginfo_t *info,
+ struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
+{
+ int ret;
+
+ if (regs->is_syscall) {
+ switch (regs->regs[4]) {
+ case ERESTART_RESTARTBLOCK:
+ case ERESTARTNOHAND:
+ regs->regs[4] = EINTR;
+ break;
+ case ERESTARTSYS:
+ if (!(ka->sa.sa_flags & SA_RESTART)) {
+ regs->regs[4] = EINTR;
+ break;
+ }
+ case ERESTARTNOINTR:
+ regs->regs[4] = regs->orig_r4;
+ regs->regs[7] = regs->orig_r7;
+ regs->cp0_epc -= 8;
+ }
+
+ regs->is_syscall = 0;
+ }
+
+ /*
+ * Set up the stack frame
+ */
+ ret = setup_rt_frame(ka, regs, sig, oldset, info);
+
+ spin_lock_irq(¤t->sighand->siglock);
+ sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
+ sigaddset(¤t->blocked, sig);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ return ret;
+}
+
+static void do_signal(struct pt_regs *regs)
+{
+ struct k_sigaction ka;
+ sigset_t *oldset;
+ siginfo_t info;
+ int signr;
+
+ /*
+ * 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;
+
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = ¤t->saved_sigmask;
+ else
+ oldset = ¤t->blocked;
+
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ if (signr > 0) {
+ /* Actually deliver the signal. */
+ if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
+ /*
+ * A signal was successfully delivered; the saved
+ * sigmask will have been stored in the signal frame,
+ * and will be restored by sigreturn, so we can simply
+ * clear the TIF_RESTORE_SIGMASK flag.
+ */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ }
+
+ return;
+ }
+
+ if (regs->is_syscall) {
+ if (regs->regs[4] == ERESTARTNOHAND ||
+ regs->regs[4] == ERESTARTSYS ||
+ regs->regs[4] == ERESTARTNOINTR) {
+ regs->regs[4] = regs->orig_r4;
+ regs->regs[7] = regs->orig_r7;
+ regs->cp0_epc -= 8;
+ }
+
+ if (regs->regs[4] == ERESTART_RESTARTBLOCK) {
+ regs->regs[27] = __NR_restart_syscall;
+ regs->regs[4] = regs->orig_r4;
+ regs->regs[7] = regs->orig_r7;
+ regs->cp0_epc -= 8;
+ }
+
+ regs->is_syscall = 0; /* Don't deal with this again. */
+ }
+
+ /*
+ * If there's no signal to deliver, we just put the saved sigmask
+ * back
+ */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
+ }
+}
+
+/*
+ * notification of userspace execution resumption
+ * - triggered by the TIF_WORK_MASK flags
+ */
+asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
+ __u32 thread_info_flags)
+{
+ /* deal with pending signal delivery */
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+ do_signal(regs);
+}
--
1.6.2
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