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-rw-r--r--arch/score/kernel/ptrace.c382
1 files changed, 382 insertions, 0 deletions
diff --git a/arch/score/kernel/ptrace.c b/arch/score/kernel/ptrace.c
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+++ b/arch/score/kernel/ptrace.c
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+/*
+ * arch/score/kernel/ptrace.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@sunplusct.com>
+ * Lennox Wu <lennox.wu@sunplusct.com>
+ *
+ * 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;
+ }
+}
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