401 lines
9.2 KiB
C
401 lines
9.2 KiB
C
/*
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* arch/score/kernel/ptrace.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <asm/uaccess.h>
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static int is_16bitinsn(unsigned long insn)
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{
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if ((insn & INSN32_MASK) == INSN32_MASK)
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return 0;
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else
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return 1;
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}
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int
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read_tsk_long(struct task_struct *child,
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unsigned long addr, unsigned long *res)
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{
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int copied;
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copied = access_process_vm(child, addr, res, sizeof(*res), 0);
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return copied != sizeof(*res) ? -EIO : 0;
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}
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int
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read_tsk_short(struct task_struct *child,
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unsigned long addr, unsigned short *res)
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{
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int copied;
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copied = access_process_vm(child, addr, res, sizeof(*res), 0);
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return copied != sizeof(*res) ? -EIO : 0;
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}
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static int
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write_tsk_short(struct task_struct *child,
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unsigned long addr, unsigned short val)
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{
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int copied;
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copied = access_process_vm(child, addr, &val, sizeof(val), 1);
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return copied != sizeof(val) ? -EIO : 0;
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}
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static int
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write_tsk_long(struct task_struct *child,
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unsigned long addr, unsigned long val)
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{
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int copied;
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copied = access_process_vm(child, addr, &val, sizeof(val), 1);
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return copied != sizeof(val) ? -EIO : 0;
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}
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/*
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* Get all user integer registers.
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*/
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static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
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{
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struct pt_regs *regs = task_pt_regs(tsk);
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return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
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}
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/*
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* Set all user integer registers.
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*/
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static int ptrace_setregs(struct task_struct *tsk, void __user *uregs)
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{
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struct pt_regs newregs;
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int ret;
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ret = -EFAULT;
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if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
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struct pt_regs *regs = task_pt_regs(tsk);
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*regs = newregs;
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ret = 0;
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}
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return ret;
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}
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void user_enable_single_step(struct task_struct *child)
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{
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/* far_epc is the target of branch */
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unsigned int epc, far_epc = 0;
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unsigned long epc_insn, far_epc_insn;
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int ninsn_type; /* next insn type 0=16b, 1=32b */
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unsigned int tmp, tmp2;
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struct pt_regs *regs = task_pt_regs(child);
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child->thread.single_step = 1;
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child->thread.ss_nextcnt = 1;
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epc = regs->cp0_epc;
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read_tsk_long(child, epc, &epc_insn);
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if (is_16bitinsn(epc_insn)) {
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if ((epc_insn & J16M) == J16) {
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tmp = epc_insn & 0xFFE;
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epc = (epc & 0xFFFFF000) | tmp;
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} else if ((epc_insn & B16M) == B16) {
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child->thread.ss_nextcnt = 2;
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tmp = (epc_insn & 0xFF) << 1;
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tmp = tmp << 23;
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tmp = (unsigned int)((int) tmp >> 23);
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far_epc = epc + tmp;
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epc += 2;
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} else if ((epc_insn & BR16M) == BR16) {
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child->thread.ss_nextcnt = 2;
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tmp = (epc_insn >> 4) & 0xF;
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far_epc = regs->regs[tmp];
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epc += 2;
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} else
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epc += 2;
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} else {
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if ((epc_insn & J32M) == J32) {
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tmp = epc_insn & 0x03FFFFFE;
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tmp2 = tmp & 0x7FFF;
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tmp = (((tmp >> 16) & 0x3FF) << 15) | tmp2;
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epc = (epc & 0xFFC00000) | tmp;
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} else if ((epc_insn & B32M) == B32) {
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child->thread.ss_nextcnt = 2;
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tmp = epc_insn & 0x03FFFFFE; /* discard LK bit */
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tmp2 = tmp & 0x3FF;
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tmp = (((tmp >> 16) & 0x3FF) << 10) | tmp2; /* 20bit */
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tmp = tmp << 12;
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tmp = (unsigned int)((int) tmp >> 12);
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far_epc = epc + tmp;
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epc += 4;
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} else if ((epc_insn & BR32M) == BR32) {
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child->thread.ss_nextcnt = 2;
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tmp = (epc_insn >> 16) & 0x1F;
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far_epc = regs->regs[tmp];
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epc += 4;
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} else
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epc += 4;
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}
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if (child->thread.ss_nextcnt == 1) {
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read_tsk_long(child, epc, &epc_insn);
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if (is_16bitinsn(epc_insn)) {
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write_tsk_short(child, epc, SINGLESTEP16_INSN);
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ninsn_type = 0;
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} else {
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write_tsk_long(child, epc, SINGLESTEP32_INSN);
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ninsn_type = 1;
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}
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if (ninsn_type == 0) { /* 16bits */
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child->thread.insn1_type = 0;
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child->thread.addr1 = epc;
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/* the insn may have 32bit data */
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child->thread.insn1 = (short)epc_insn;
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} else {
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child->thread.insn1_type = 1;
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child->thread.addr1 = epc;
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child->thread.insn1 = epc_insn;
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}
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} else {
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/* branch! have two target child->thread.ss_nextcnt=2 */
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read_tsk_long(child, epc, &epc_insn);
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read_tsk_long(child, far_epc, &far_epc_insn);
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if (is_16bitinsn(epc_insn)) {
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write_tsk_short(child, epc, SINGLESTEP16_INSN);
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ninsn_type = 0;
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} else {
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write_tsk_long(child, epc, SINGLESTEP32_INSN);
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ninsn_type = 1;
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}
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if (ninsn_type == 0) { /* 16bits */
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child->thread.insn1_type = 0;
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child->thread.addr1 = epc;
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/* the insn may have 32bit data */
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child->thread.insn1 = (short)epc_insn;
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} else {
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child->thread.insn1_type = 1;
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child->thread.addr1 = epc;
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child->thread.insn1 = epc_insn;
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}
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if (is_16bitinsn(far_epc_insn)) {
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write_tsk_short(child, far_epc, SINGLESTEP16_INSN);
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ninsn_type = 0;
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} else {
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write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
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ninsn_type = 1;
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}
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if (ninsn_type == 0) { /* 16bits */
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child->thread.insn2_type = 0;
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child->thread.addr2 = far_epc;
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/* the insn may have 32bit data */
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child->thread.insn2 = (short)far_epc_insn;
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} else {
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child->thread.insn2_type = 1;
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child->thread.addr2 = far_epc;
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child->thread.insn2 = far_epc_insn;
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}
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}
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}
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void user_disable_single_step(struct task_struct *child)
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{
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if (child->thread.insn1_type == 0)
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write_tsk_short(child, child->thread.addr1,
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child->thread.insn1);
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if (child->thread.insn1_type == 1)
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write_tsk_long(child, child->thread.addr1,
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child->thread.insn1);
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if (child->thread.ss_nextcnt == 2) { /* branch */
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if (child->thread.insn1_type == 0)
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write_tsk_short(child, child->thread.addr1,
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child->thread.insn1);
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if (child->thread.insn1_type == 1)
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write_tsk_long(child, child->thread.addr1,
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child->thread.insn1);
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if (child->thread.insn2_type == 0)
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write_tsk_short(child, child->thread.addr2,
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child->thread.insn2);
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if (child->thread.insn2_type == 1)
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write_tsk_long(child, child->thread.addr2,
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child->thread.insn2);
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}
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child->thread.single_step = 0;
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child->thread.ss_nextcnt = 0;
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}
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void ptrace_disable(struct task_struct *child)
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{
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user_disable_single_step(child);
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}
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long
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arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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int ret;
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unsigned long __user *datap = (void __user *)data;
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switch (request) {
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/* Read the word at location addr in the USER area. */
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case PTRACE_PEEKUSR: {
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struct pt_regs *regs;
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unsigned long tmp;
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regs = task_pt_regs(child);
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tmp = 0; /* Default return value. */
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switch (addr) {
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case 0 ... 31:
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tmp = regs->regs[addr];
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break;
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case PC:
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tmp = regs->cp0_epc;
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break;
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case ECR:
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tmp = regs->cp0_ecr;
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break;
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case EMA:
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tmp = regs->cp0_ema;
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break;
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case CEH:
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tmp = regs->ceh;
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break;
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case CEL:
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tmp = regs->cel;
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break;
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case CONDITION:
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tmp = regs->cp0_condition;
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break;
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case PSR:
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tmp = regs->cp0_psr;
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break;
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case COUNTER:
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tmp = regs->sr0;
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break;
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case LDCR:
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tmp = regs->sr1;
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break;
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case STCR:
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tmp = regs->sr2;
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break;
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default:
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tmp = 0;
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return -EIO;
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}
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ret = put_user(tmp, (unsigned int __user *) datap);
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return ret;
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}
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case PTRACE_POKEUSR: {
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struct pt_regs *regs;
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ret = 0;
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regs = task_pt_regs(child);
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switch (addr) {
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case 0 ... 31:
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regs->regs[addr] = data;
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break;
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case PC:
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regs->cp0_epc = data;
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break;
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case CEH:
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regs->ceh = data;
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break;
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case CEL:
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regs->cel = data;
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break;
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case CONDITION:
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regs->cp0_condition = data;
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break;
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case PSR:
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case COUNTER:
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case STCR:
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case LDCR:
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break; /* user can't write the reg */
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default:
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/* The rest are not allowed. */
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ret = -EIO;
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break;
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}
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break;
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}
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case PTRACE_GETREGS:
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ret = ptrace_getregs(child, (void __user *)datap);
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break;
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case PTRACE_SETREGS:
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ret = ptrace_setregs(child, (void __user *)datap);
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break;
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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/*
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* Notification of system call entry/exit
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* - triggered by current->work.syscall_trace
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*/
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asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
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{
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if (!(current->ptrace & PT_PTRACED))
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return;
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if (!test_thread_flag(TIF_SYSCALL_TRACE))
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return;
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/* The 0x80 provides a way for the tracing parent to distinguish
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between a syscall stop and SIGTRAP delivery. */
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ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
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0x80 : 0));
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/*
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* this isn't the same as continuing with a signal, but it will do
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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if (current->exit_code) {
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send_sig(current->exit_code, current, 1);
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current->exit_code = 0;
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}
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}
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