mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 14:14:24 +08:00
19b39c38ab
Pull ptrace regset updates from Al Viro:
"Internal regset API changes:
- regularize copy_regset_{to,from}_user() callers
- switch to saner calling conventions for ->get()
- kill user_regset_copyout()
The ->put() side of things will have to wait for the next cycle,
unfortunately.
The balance is about -1KLoC and replacements for ->get() instances are
a lot saner"
* 'work.regset' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (41 commits)
regset: kill user_regset_copyout{,_zero}()
regset(): kill ->get_size()
regset: kill ->get()
csky: switch to ->regset_get()
xtensa: switch to ->regset_get()
parisc: switch to ->regset_get()
nds32: switch to ->regset_get()
nios2: switch to ->regset_get()
hexagon: switch to ->regset_get()
h8300: switch to ->regset_get()
openrisc: switch to ->regset_get()
riscv: switch to ->regset_get()
c6x: switch to ->regset_get()
ia64: switch to ->regset_get()
arc: switch to ->regset_get()
arm: switch to ->regset_get()
sh: convert to ->regset_get()
arm64: switch to ->regset_get()
mips: switch to ->regset_get()
sparc: switch to ->regset_get()
...
400 lines
10 KiB
C
400 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
|
|
#include <linux/audit.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.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/signal.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/tracehook.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/user.h>
|
|
|
|
#include <asm/thread_info.h>
|
|
#include <asm/page.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
#include <abi/regdef.h>
|
|
|
|
#define CREATE_TRACE_POINTS
|
|
#include <trace/events/syscalls.h>
|
|
|
|
/* sets the trace bits. */
|
|
#define TRACE_MODE_SI (1 << 14)
|
|
#define TRACE_MODE_RUN 0
|
|
#define TRACE_MODE_MASK ~(0x3 << 14)
|
|
|
|
/*
|
|
* Make sure the single step bit is not set.
|
|
*/
|
|
static void singlestep_disable(struct task_struct *tsk)
|
|
{
|
|
struct pt_regs *regs;
|
|
|
|
regs = task_pt_regs(tsk);
|
|
regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;
|
|
|
|
/* Enable irq */
|
|
regs->sr |= BIT(6);
|
|
}
|
|
|
|
static void singlestep_enable(struct task_struct *tsk)
|
|
{
|
|
struct pt_regs *regs;
|
|
|
|
regs = task_pt_regs(tsk);
|
|
regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;
|
|
|
|
/* Disable irq */
|
|
regs->sr &= ~BIT(6);
|
|
}
|
|
|
|
/*
|
|
* Make sure the single step bit is set.
|
|
*/
|
|
void user_enable_single_step(struct task_struct *child)
|
|
{
|
|
singlestep_enable(child);
|
|
}
|
|
|
|
void user_disable_single_step(struct task_struct *child)
|
|
{
|
|
singlestep_disable(child);
|
|
}
|
|
|
|
enum csky_regset {
|
|
REGSET_GPR,
|
|
REGSET_FPR,
|
|
};
|
|
|
|
static int gpr_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
struct membuf to)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(target);
|
|
|
|
/* Abiv1 regs->tls is fake and we need sync here. */
|
|
regs->tls = task_thread_info(target)->tp_value;
|
|
|
|
return membuf_write(&to, regs, sizeof(regs));
|
|
}
|
|
|
|
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 ret;
|
|
struct pt_regs regs;
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0, -1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
regs.sr = task_pt_regs(target)->sr;
|
|
#ifdef CONFIG_CPU_HAS_HILO
|
|
regs.dcsr = task_pt_regs(target)->dcsr;
|
|
#endif
|
|
task_thread_info(target)->tp_value = regs.tls;
|
|
|
|
*task_pt_regs(target) = regs;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fpr_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
struct membuf to)
|
|
{
|
|
struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
|
|
|
|
#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
|
|
int i;
|
|
struct user_fp tmp = *regs;
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
tmp.vr[i*4] = regs->vr[i*2];
|
|
tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];
|
|
}
|
|
|
|
for (i = 0; i < 32; i++)
|
|
tmp.vr[64 + i] = regs->vr[32 + i];
|
|
|
|
return membuf_write(&to, &tmp, sizeof(tmp));
|
|
#else
|
|
return membuf_write(&to, regs, sizeof(*regs));
|
|
#endif
|
|
}
|
|
|
|
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)
|
|
{
|
|
int ret;
|
|
struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
|
|
|
|
#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
|
|
int i;
|
|
struct user_fp tmp;
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
|
|
|
|
*regs = tmp;
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
regs->vr[i*2] = tmp.vr[i*4];
|
|
regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];
|
|
}
|
|
|
|
for (i = 0; i < 32; i++)
|
|
regs->vr[32 + i] = tmp.vr[64 + i];
|
|
#else
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct user_regset csky_regsets[] = {
|
|
[REGSET_GPR] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = sizeof(struct pt_regs) / sizeof(u32),
|
|
.size = sizeof(u32),
|
|
.align = sizeof(u32),
|
|
.regset_get = gpr_get,
|
|
.set = gpr_set,
|
|
},
|
|
[REGSET_FPR] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = sizeof(struct user_fp) / sizeof(u32),
|
|
.size = sizeof(u32),
|
|
.align = sizeof(u32),
|
|
.regset_get = fpr_get,
|
|
.set = fpr_set,
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_csky_view = {
|
|
.name = "csky",
|
|
.e_machine = ELF_ARCH,
|
|
.regsets = csky_regsets,
|
|
.n = ARRAY_SIZE(csky_regsets),
|
|
};
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
return &user_csky_view;
|
|
}
|
|
|
|
struct pt_regs_offset {
|
|
const char *name;
|
|
int offset;
|
|
};
|
|
|
|
#define REG_OFFSET_NAME(r) {.name = #r, .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(tls),
|
|
REG_OFFSET_NAME(lr),
|
|
REG_OFFSET_NAME(pc),
|
|
REG_OFFSET_NAME(sr),
|
|
REG_OFFSET_NAME(usp),
|
|
REG_OFFSET_NAME(orig_a0),
|
|
REG_OFFSET_NAME(a0),
|
|
REG_OFFSET_NAME(a1),
|
|
REG_OFFSET_NAME(a2),
|
|
REG_OFFSET_NAME(a3),
|
|
REG_OFFSET_NAME(regs[0]),
|
|
REG_OFFSET_NAME(regs[1]),
|
|
REG_OFFSET_NAME(regs[2]),
|
|
REG_OFFSET_NAME(regs[3]),
|
|
REG_OFFSET_NAME(regs[4]),
|
|
REG_OFFSET_NAME(regs[5]),
|
|
REG_OFFSET_NAME(regs[6]),
|
|
REG_OFFSET_NAME(regs[7]),
|
|
REG_OFFSET_NAME(regs[8]),
|
|
REG_OFFSET_NAME(regs[9]),
|
|
#if defined(__CSKYABIV2__)
|
|
REG_OFFSET_NAME(exregs[0]),
|
|
REG_OFFSET_NAME(exregs[1]),
|
|
REG_OFFSET_NAME(exregs[2]),
|
|
REG_OFFSET_NAME(exregs[3]),
|
|
REG_OFFSET_NAME(exregs[4]),
|
|
REG_OFFSET_NAME(exregs[5]),
|
|
REG_OFFSET_NAME(exregs[6]),
|
|
REG_OFFSET_NAME(exregs[7]),
|
|
REG_OFFSET_NAME(exregs[8]),
|
|
REG_OFFSET_NAME(exregs[9]),
|
|
REG_OFFSET_NAME(exregs[10]),
|
|
REG_OFFSET_NAME(exregs[11]),
|
|
REG_OFFSET_NAME(exregs[12]),
|
|
REG_OFFSET_NAME(exregs[13]),
|
|
REG_OFFSET_NAME(exregs[14]),
|
|
REG_OFFSET_NAME(rhi),
|
|
REG_OFFSET_NAME(rlo),
|
|
REG_OFFSET_NAME(dcsr),
|
|
#endif
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* regs_within_kernel_stack() - check the address in the stack
|
|
* @regs: pt_regs which contains kernel stack pointer.
|
|
* @addr: address which is checked.
|
|
*
|
|
* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
|
|
* If @addr is within the kernel stack, it returns true. If not, returns false.
|
|
*/
|
|
static bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
|
|
{
|
|
return (addr & ~(THREAD_SIZE - 1)) ==
|
|
(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1));
|
|
}
|
|
|
|
/**
|
|
* regs_get_kernel_stack_nth() - get Nth entry of the stack
|
|
* @regs: pt_regs which contains kernel stack pointer.
|
|
* @n: stack entry number.
|
|
*
|
|
* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
|
|
* is specified by @regs. If the @n th entry is NOT in the kernel stack,
|
|
* this returns 0.
|
|
*/
|
|
unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
|
|
{
|
|
unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
|
|
|
|
addr += n;
|
|
if (regs_within_kernel_stack(regs, (unsigned long)addr))
|
|
return *addr;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
singlestep_disable(child);
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
long ret = -EIO;
|
|
|
|
switch (request) {
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
if (tracehook_report_syscall_entry(regs))
|
|
return -1;
|
|
|
|
if (secure_computing() == -1)
|
|
return -1;
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
|
|
trace_sys_enter(regs, syscall_get_nr(current, regs));
|
|
|
|
audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
|
|
{
|
|
audit_syscall_exit(regs);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(regs, 0);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
|
|
trace_sys_exit(regs, syscall_get_return_value(current, regs));
|
|
}
|
|
|
|
void show_regs(struct pt_regs *fp)
|
|
{
|
|
pr_info("\nCURRENT PROCESS:\n\n");
|
|
pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
|
|
|
|
if (current->mm) {
|
|
pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
|
|
(int) current->mm->start_code,
|
|
(int) current->mm->end_code,
|
|
(int) current->mm->start_data,
|
|
(int) current->mm->end_data,
|
|
(int) current->mm->end_data,
|
|
(int) current->mm->brk);
|
|
pr_info("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
|
|
(int) current->mm->start_stack,
|
|
(int) (((unsigned long) current) + 2 * PAGE_SIZE));
|
|
}
|
|
|
|
pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
|
|
pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
|
|
pr_info("SP: 0x%08lx\n", (long)fp);
|
|
pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
|
|
pr_info("PSR: 0x%08lx\n", (long)fp->sr);
|
|
|
|
pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
|
|
fp->a0, fp->a1, fp->a2, fp->a3);
|
|
#if defined(__CSKYABIV2__)
|
|
pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
|
|
fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
|
|
pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
|
|
fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
|
|
pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
|
|
fp->regs[8], fp->regs[9], fp->lr);
|
|
pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
|
|
fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
|
|
pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
|
|
fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
|
|
pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
|
|
fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
|
|
pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
|
|
fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
|
|
pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
|
|
fp->rhi, fp->rlo);
|
|
#else
|
|
pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
|
|
fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
|
|
pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
|
|
fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
|
|
pr_info("r14: 0x%08lx r1: 0x%08lx\n",
|
|
fp->regs[8], fp->regs[9]);
|
|
#endif
|
|
|
|
return;
|
|
}
|