159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/regset.h>
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#include <linux/unistd.h>
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#include <linux/elf.h>
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static struct callee_regs *task_callee_regs(struct task_struct *tsk)
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{
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struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
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return tmp;
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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 *ptregs = task_pt_regs(target);
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const struct callee_regs *cregs = task_callee_regs(target);
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int ret = 0;
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unsigned int stop_pc_val;
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#define REG_O_CHUNK(START, END, PTR) \
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if (!ret) \
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
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offsetof(struct user_regs_struct, START), \
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offsetof(struct user_regs_struct, END));
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#define REG_O_ONE(LOC, PTR) \
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if (!ret) \
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
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offsetof(struct user_regs_struct, LOC), \
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offsetof(struct user_regs_struct, LOC) + 4);
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REG_O_CHUNK(scratch, callee, ptregs);
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REG_O_CHUNK(callee, efa, cregs);
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REG_O_CHUNK(efa, stop_pc, &target->thread.fault_address);
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if (!ret) {
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if (in_brkpt_trap(ptregs)) {
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stop_pc_val = target->thread.fault_address;
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pr_debug("\t\tstop_pc (brk-pt)\n");
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} else {
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stop_pc_val = ptregs->ret;
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pr_debug("\t\tstop_pc (others)\n");
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}
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REG_O_ONE(stop_pc, &stop_pc_val);
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}
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return ret;
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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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const struct pt_regs *ptregs = task_pt_regs(target);
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const struct callee_regs *cregs = task_callee_regs(target);
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int ret = 0;
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#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
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if (!ret) \
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
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(void *)(PTR), \
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offsetof(struct user_regs_struct, FIRST), \
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offsetof(struct user_regs_struct, NEXT));
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#define REG_IN_ONE(LOC, PTR) \
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if (!ret) \
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
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(void *)(PTR), \
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offsetof(struct user_regs_struct, LOC), \
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offsetof(struct user_regs_struct, LOC) + 4);
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#define REG_IGNORE_ONE(LOC) \
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if (!ret) \
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
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offsetof(struct user_regs_struct, LOC), \
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offsetof(struct user_regs_struct, LOC) + 4);
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/* TBD: disallow updates to STATUS32, orig_r8 etc*/
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REG_IN_CHUNK(scratch, callee, ptregs); /* pt_regs[bta..orig_r8] */
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REG_IN_CHUNK(callee, efa, cregs); /* callee_regs[r25..r13] */
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REG_IGNORE_ONE(efa); /* efa update invalid */
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REG_IN_ONE(stop_pc, &ptregs->ret); /* stop_pc: PC update */
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return ret;
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}
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enum arc_getset {
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REGSET_GENERAL,
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};
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static const struct user_regset arc_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(unsigned long),
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.align = sizeof(unsigned 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_arc_view = {
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.name = UTS_MACHINE,
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.e_machine = EM_ARCOMPACT,
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.regsets = arc_regsets,
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.n = ARRAY_SIZE(arc_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_arc_view;
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}
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void ptrace_disable(struct task_struct *child)
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{
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}
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long 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 = -EIO;
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pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
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switch (request) {
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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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asmlinkage int syscall_trace_entry(struct pt_regs *regs)
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{
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if (tracehook_report_syscall_entry(regs))
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return ULONG_MAX;
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return regs->r8;
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}
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asmlinkage void syscall_trace_exit(struct pt_regs *regs)
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{
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tracehook_report_syscall_exit(regs, 0);
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}
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