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![Ingo Molnar](/assets/img/avatar_default.png)
We are going to split <linux/sched/task_stack.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/task_stack.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
386 lines
9.8 KiB
C
386 lines
9.8 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/elf.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ptrace.h>
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#include <linux/regset.h>
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#include <linux/sched/task_stack.h>
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#include <linux/uaccess.h>
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/*
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* retrieve the contents of SCORE userspace general registers
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*/
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static int genregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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const struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* skip 9 * sizeof(unsigned long) not use for pt_regs */
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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0, offsetof(struct pt_regs, regs));
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/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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offsetof(struct pt_regs, regs),
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offsetof(struct pt_regs, cp0_condition));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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/*
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* update the contents of the SCORE userspace general registers
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*/
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static int genregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* skip 9 * sizeof(unsigned long) */
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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0, offsetof(struct pt_regs, regs));
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/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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offsetof(struct pt_regs, regs),
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offsetof(struct pt_regs, cp0_condition));
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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/*
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* Define the register sets available on the score7 under Linux
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*/
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enum score7_regset {
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REGSET_GENERAL,
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};
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static const struct user_regset score7_regsets[] = {
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(long),
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.align = sizeof(long),
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.get = genregs_get,
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.set = genregs_set,
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},
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};
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static const struct user_regset_view user_score_native_view = {
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.name = "score7",
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.e_machine = EM_SCORE7,
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.regsets = score7_regsets,
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.n = ARRAY_SIZE(score7_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_score_native_view;
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}
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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), FOLL_FORCE);
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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), FOLL_FORCE);
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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),
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FOLL_FORCE | FOLL_WRITE);
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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),
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FOLL_FORCE | FOLL_WRITE);
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return copied != sizeof(val) ? -EIO : 0;
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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,
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unsigned long addr, unsigned 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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case PTRACE_GETREGS:
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ret = copy_regset_to_user(child, &user_score_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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datap);
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break;
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case PTRACE_SETREGS:
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ret = copy_regset_from_user(child, &user_score_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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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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