+++ /dev/null
-/*
- * 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 <linux/sched/task_stack.h>
-
-#include <linux/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), FOLL_FORCE);
-
- 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), FOLL_FORCE);
-
- 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),
- FOLL_FORCE | FOLL_WRITE);
-
- 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),
- FOLL_FORCE | FOLL_WRITE);
-
- 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,
- unsigned long addr, unsigned 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),
- datap);
- break;
-
- case PTRACE_SETREGS:
- ret = copy_regset_from_user(child, &user_score_native_view,
- REGSET_GENERAL,
- 0, sizeof(struct pt_regs),
- 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;
- }
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff