blob: e6ab87948e1d3e4d975da6e54db0be18f96a0bb8 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Author: Hanlu Li <lihanlu@loongson.cn>
* Huacai Chen <chenhuacai@loongson.cn>
*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*
* Derived from MIPS:
* Copyright (C) 1992 Ross Biro
* Copyright (C) Linus Torvalds
* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
* Copyright (C) 1996 David S. Miller
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999 MIPS Technologies, Inc.
* Copyright (C) 2000 Ulf Carlsson
*/
#include <linux/kernel.h>
#include <linux/audit.h>
#include <linux/compiler.h>
#include <linux/context_tracking.h>
#include <linux/elf.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/security.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/seccomp.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
#include <asm/cpu.h>
#include <asm/cpu-info.h>
#include <asm/fpu.h>
#include <asm/loongarch.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/reg.h>
#include <asm/syscall.h>
static void init_fp_ctx(struct task_struct *target)
{
/* The target already has context */
if (tsk_used_math(target))
return;
/* Begin with data registers set to all 1s... */
memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr));
set_stopped_child_used_math(target);
}
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure single step bits etc are not set.
*/
void ptrace_disable(struct task_struct *child)
{
/* Don't load the watchpoint registers for the ex-child. */
clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}
/* regset get/set implementations */
static int gpr_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
int r;
struct pt_regs *regs = task_pt_regs(target);
r = membuf_write(&to, &regs->regs, sizeof(u64) * GPR_NUM);
r = membuf_write(&to, &regs->orig_a0, sizeof(u64));
r = membuf_write(&to, &regs->csr_era, sizeof(u64));
r = membuf_write(&to, &regs->csr_badvaddr, sizeof(u64));
return r;
}
static int gpr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int err;
int a0_start = sizeof(u64) * GPR_NUM;
int era_start = a0_start + sizeof(u64);
int badvaddr_start = era_start + sizeof(u64);
struct pt_regs *regs = task_pt_regs(target);
err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->regs,
0, a0_start);
err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->orig_a0,
a0_start, a0_start + sizeof(u64));
err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->csr_era,
era_start, era_start + sizeof(u64));
err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->csr_badvaddr,
badvaddr_start, badvaddr_start + sizeof(u64));
return err;
}
/*
* Get the general floating-point registers.
*/
static int gfpr_get(struct task_struct *target, struct membuf *to)
{
return membuf_write(to, &target->thread.fpu.fpr,
sizeof(elf_fpreg_t) * NUM_FPU_REGS);
}
static int gfpr_get_simd(struct task_struct *target, struct membuf *to)
{
int i, r;
u64 fpr_val;
BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
for (i = 0; i < NUM_FPU_REGS; i++) {
fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
r = membuf_write(to, &fpr_val, sizeof(elf_fpreg_t));
}
return r;
}
/*
* Choose the appropriate helper for general registers, and then copy
* the FCC and FCSR registers separately.
*/
static int fpr_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
int r;
if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
r = gfpr_get(target, &to);
else
r = gfpr_get_simd(target, &to);
r = membuf_write(&to, &target->thread.fpu.fcc, sizeof(target->thread.fpu.fcc));
r = membuf_write(&to, &target->thread.fpu.fcsr, sizeof(target->thread.fpu.fcsr));
return r;
}
static int gfpr_set(struct task_struct *target,
unsigned int *pos, unsigned int *count,
const void **kbuf, const void __user **ubuf)
{
return user_regset_copyin(pos, count, kbuf, ubuf,
&target->thread.fpu.fpr,
0, NUM_FPU_REGS * sizeof(elf_fpreg_t));
}
static int gfpr_set_simd(struct task_struct *target,
unsigned int *pos, unsigned int *count,
const void **kbuf, const void __user **ubuf)
{
int i, err;
u64 fpr_val;
BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
for (i = 0; i < NUM_FPU_REGS && *count > 0; i++) {
err = user_regset_copyin(pos, count, kbuf, ubuf,
&fpr_val, i * sizeof(elf_fpreg_t),
(i + 1) * sizeof(elf_fpreg_t));
if (err)
return err;
set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
}
return 0;
}
/*
* Choose the appropriate helper for general registers, and then copy
* the FCC register separately.
*/
static int fpr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
const int fcc_start = NUM_FPU_REGS * sizeof(elf_fpreg_t);
const int fcc_end = fcc_start + sizeof(u64);
int err;
BUG_ON(count % sizeof(elf_fpreg_t));
if (pos + count > sizeof(elf_fpregset_t))
return -EIO;
init_fp_ctx(target);
if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
err = gfpr_set(target, &pos, &count, &kbuf, &ubuf);
else
err = gfpr_set_simd(target, &pos, &count, &kbuf, &ubuf);
if (err)
return err;
if (count > 0)
err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.fcc,
fcc_start, fcc_end);
return err;
}
static int cfg_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
int i, r;
u32 cfg_val;
i = 0;
while (to.left > 0) {
cfg_val = read_cpucfg(i++);
r = membuf_write(&to, &cfg_val, sizeof(u32));
}
return r;
}
/*
* CFG registers are read-only.
*/
static int cfg_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
return 0;
}
struct pt_regs_offset {
const char *name;
int offset;
};
#define REG_OFFSET_NAME(n, r) {.name = #n, .offset = offsetof(struct pt_regs, r)}
#define REG_OFFSET_END {.name = NULL, .offset = 0}
static const struct pt_regs_offset regoffset_table[] = {
REG_OFFSET_NAME(r0, regs[0]),
REG_OFFSET_NAME(r1, regs[1]),
REG_OFFSET_NAME(r2, regs[2]),
REG_OFFSET_NAME(r3, regs[3]),
REG_OFFSET_NAME(r4, regs[4]),
REG_OFFSET_NAME(r5, regs[5]),
REG_OFFSET_NAME(r6, regs[6]),
REG_OFFSET_NAME(r7, regs[7]),
REG_OFFSET_NAME(r8, regs[8]),
REG_OFFSET_NAME(r9, regs[9]),
REG_OFFSET_NAME(r10, regs[10]),
REG_OFFSET_NAME(r11, regs[11]),
REG_OFFSET_NAME(r12, regs[12]),
REG_OFFSET_NAME(r13, regs[13]),
REG_OFFSET_NAME(r14, regs[14]),
REG_OFFSET_NAME(r15, regs[15]),
REG_OFFSET_NAME(r16, regs[16]),
REG_OFFSET_NAME(r17, regs[17]),
REG_OFFSET_NAME(r18, regs[18]),
REG_OFFSET_NAME(r19, regs[19]),
REG_OFFSET_NAME(r20, regs[20]),
REG_OFFSET_NAME(r21, regs[21]),
REG_OFFSET_NAME(r22, regs[22]),
REG_OFFSET_NAME(r23, regs[23]),
REG_OFFSET_NAME(r24, regs[24]),
REG_OFFSET_NAME(r25, regs[25]),
REG_OFFSET_NAME(r26, regs[26]),
REG_OFFSET_NAME(r27, regs[27]),
REG_OFFSET_NAME(r28, regs[28]),
REG_OFFSET_NAME(r29, regs[29]),
REG_OFFSET_NAME(r30, regs[30]),
REG_OFFSET_NAME(r31, regs[31]),
REG_OFFSET_NAME(orig_a0, orig_a0),
REG_OFFSET_NAME(csr_era, csr_era),
REG_OFFSET_NAME(csr_badvaddr, csr_badvaddr),
REG_OFFSET_NAME(csr_crmd, csr_crmd),
REG_OFFSET_NAME(csr_prmd, csr_prmd),
REG_OFFSET_NAME(csr_euen, csr_euen),
REG_OFFSET_NAME(csr_ecfg, csr_ecfg),
REG_OFFSET_NAME(csr_estat, csr_estat),
REG_OFFSET_END,
};
/**
* regs_query_register_offset() - query register offset from its name
* @name: the name of a register
*
* regs_query_register_offset() returns the offset of a register in struct
* pt_regs from its name. If the name is invalid, this returns -EINVAL;
*/
int regs_query_register_offset(const char *name)
{
const struct pt_regs_offset *roff;
for (roff = regoffset_table; roff->name != NULL; roff++)
if (!strcmp(roff->name, name))
return roff->offset;
return -EINVAL;
}
enum loongarch_regset {
REGSET_GPR,
REGSET_FPR,
REGSET_CPUCFG,
};
static const struct user_regset loongarch64_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(elf_greg_t),
.align = sizeof(elf_greg_t),
.regset_get = gpr_get,
.set = gpr_set,
},
[REGSET_FPR] = {
.core_note_type = NT_PRFPREG,
.n = ELF_NFPREG,
.size = sizeof(elf_fpreg_t),
.align = sizeof(elf_fpreg_t),
.regset_get = fpr_get,
.set = fpr_set,
},
[REGSET_CPUCFG] = {
.core_note_type = NT_LOONGARCH_CPUCFG,
.n = 64,
.size = sizeof(u32),
.align = sizeof(u32),
.regset_get = cfg_get,
.set = cfg_set,
},
};
static const struct user_regset_view user_loongarch64_view = {
.name = "loongarch64",
.e_machine = ELF_ARCH,
.regsets = loongarch64_regsets,
.n = ARRAY_SIZE(loongarch64_regsets),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_loongarch64_view;
}
static inline int read_user(struct task_struct *target, unsigned long addr,
unsigned long __user *data)
{
unsigned long tmp = 0;
switch (addr) {
case 0 ... 31:
tmp = task_pt_regs(target)->regs[addr];
break;
case ARG0:
tmp = task_pt_regs(target)->orig_a0;
break;
case PC:
tmp = task_pt_regs(target)->csr_era;
break;
case BADVADDR:
tmp = task_pt_regs(target)->csr_badvaddr;
break;
default:
return -EIO;
}
return put_user(tmp, data);
}
static inline int write_user(struct task_struct *target, unsigned long addr,
unsigned long data)
{
switch (addr) {
case 0 ... 31:
task_pt_regs(target)->regs[addr] = data;
break;
case ARG0:
task_pt_regs(target)->orig_a0 = data;
break;
case PC:
task_pt_regs(target)->csr_era = data;
break;
case BADVADDR:
task_pt_regs(target)->csr_badvaddr = data;
break;
default:
return -EIO;
}
return 0;
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret;
unsigned long __user *datap = (void __user *) data;
switch (request) {
case PTRACE_PEEKUSR:
ret = read_user(child, addr, datap);
break;
case PTRACE_POKEUSR:
ret = write_user(child, addr, data);
break;
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}