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// SPDX-License-Identifier: GPL-2.0-only
/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*
* Updated for 2.6.34: Mark Salter <msalter@redhat.com>
*/
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/sched/task_stack.h>
#include <asm/cacheflush.h>
#define PT_REG_SIZE (sizeof(struct pt_regs))
/*
* Called by kernel/ptrace.c when detaching.
*/
void ptrace_disable(struct task_struct *child)
{
/* nothing to do */
}
/*
* Get a register number from live pt_regs for the specified task.
*/
static inline long get_reg(struct task_struct *task, int regno)
{
long *addr = (long *)task_pt_regs(task);
if (regno == PT_TSR || regno == PT_CSR)
return 0;
return addr[regno];
}
/*
* Write contents of register REGNO in task TASK.
*/
static inline int put_reg(struct task_struct *task,
int regno,
unsigned long data)
{
unsigned long *addr = (unsigned long *)task_pt_regs(task);
if (regno != PT_TSR && regno != PT_CSR)
addr[regno] = data;
return 0;
}
/* regset get/set implementations */
static int gpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct pt_regs *regs = task_pt_regs(target);
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs,
0, sizeof(*regs));
}
enum c6x_regset {
REGSET_GPR,
};
static const struct user_regset c6x_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(u32),
.align = sizeof(u32),
.get = gpr_get,
},
};
static const struct user_regset_view user_c6x_native_view = {
.name = "tic6x",
.e_machine = EM_TI_C6000,
.regsets = c6x_regsets,
.n = ARRAY_SIZE(c6x_regsets),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_c6x_native_view;
}
/*
* Perform ptrace request
*/
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret = 0;
switch (request) {
/*
* write the word at location addr.
*/
case PTRACE_POKETEXT:
ret = generic_ptrace_pokedata(child, addr, data);
if (ret == 0 && request == PTRACE_POKETEXT)
flush_icache_range(addr, addr + 4);
break;
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
/*
* handle tracing of system call entry
* - return the revised system call number or ULONG_MAX to cause ENOSYS
*/
asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
{
if (tracehook_report_syscall_entry(regs))
/* tracing decided this syscall should not happen, so
* We'll return a bogus call number to get an ENOSYS
* error, but leave the original number in
* regs->orig_a4
*/
return ULONG_MAX;
return regs->b0;
}
/*
* handle tracing of system call exit
*/
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
tracehook_report_syscall_exit(regs, 0);
}
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