C6X: ptrace support
Original port to early 2.6 kernel using TI COFF toolchain. Brought up to date by Mark Salter <msalter@redhat.com> Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
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Aurelien Jacquiot
committed by
Mark Salter
Mark Salter
parent
64236ac144
commit
52679b2d73
187
arch/c6x/kernel/ptrace.c
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187
arch/c6x/kernel/ptrace.c
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/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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*
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* Updated for 2.6.34: Mark Salter <msalter@redhat.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/elf.h>
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#include <asm/cacheflush.h>
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#define PT_REG_SIZE (sizeof(struct pt_regs))
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/*
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* Called by kernel/ptrace.c when detaching.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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/* nothing to do */
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}
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/*
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* Get a register number from live pt_regs for the specified task.
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*/
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static inline long get_reg(struct task_struct *task, int regno)
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{
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long *addr = (long *)task_pt_regs(task);
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if (regno == PT_TSR || regno == PT_CSR)
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return 0;
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return addr[regno];
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}
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/*
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* Write contents of register REGNO in task TASK.
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*/
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static inline int put_reg(struct task_struct *task,
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int regno,
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unsigned long data)
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{
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unsigned long *addr = (unsigned long *)task_pt_regs(task);
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if (regno != PT_TSR && regno != PT_CSR)
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addr[regno] = data;
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return 0;
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}
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/* regset get/set implementations */
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static int gpr_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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struct pt_regs *regs = task_pt_regs(target);
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs,
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0, sizeof(*regs));
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}
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static int gpr_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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int ret;
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struct pt_regs *regs = task_pt_regs(target);
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/* Don't copyin TSR or CSR */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s,
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0, PT_TSR * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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PT_TSR * sizeof(long),
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(PT_TSR + 1) * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s,
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(PT_TSR + 1) * sizeof(long),
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PT_CSR * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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PT_CSR * sizeof(long),
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(PT_CSR + 1) * sizeof(long));
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if (ret)
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return ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s,
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(PT_CSR + 1) * sizeof(long), -1);
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return ret;
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}
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enum c6x_regset {
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REGSET_GPR,
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};
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static const struct user_regset c6x_regsets[] = {
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[REGSET_GPR] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(u32),
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.align = sizeof(u32),
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.get = gpr_get,
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.set = gpr_set
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},
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};
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static const struct user_regset_view user_c6x_native_view = {
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.name = "tic6x",
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.e_machine = EM_TI_C6000,
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.regsets = c6x_regsets,
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.n = ARRAY_SIZE(c6x_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_c6x_native_view;
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}
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/*
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* Perform ptrace request
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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 = 0;
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switch (request) {
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/*
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* write the word at location addr.
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*/
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case PTRACE_POKETEXT:
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ret = generic_ptrace_pokedata(child, addr, data);
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if (ret == 0 && request == PTRACE_POKETEXT)
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flush_icache_range(addr, addr + 4);
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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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* handle tracing of system call entry
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* - return the revised system call number or ULONG_MAX to cause ENOSYS
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*/
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asmlinkage unsigned long 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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/* tracing decided this syscall should not happen, so
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* We'll return a bogus call number to get an ENOSYS
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* error, but leave the original number in
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* regs->orig_a4
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*/
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return ULONG_MAX;
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return regs->b0;
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}
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/*
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* handle tracing of system call exit
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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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