// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*/
#include <linux/ptrace.h>
#include <linux/sched/task_stack.h>
#include <linux/regset.h>
#include <linux/unistd.h>
#include <linux/elf.h>
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
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}
#ifdef CONFIG_ISA_ARCOMPACT
static const struct pt_regs_offset regoffset_table[] = {
REG_OFFSET_NAME(bta),
REG_OFFSET_NAME(lp_start),
REG_OFFSET_NAME(lp_end),
REG_OFFSET_NAME(lp_count),
REG_OFFSET_NAME(status32),
REG_OFFSET_NAME(ret),
REG_OFFSET_NAME(blink),
REG_OFFSET_NAME(fp),
REG_OFFSET_NAME(r26),
REG_OFFSET_NAME(r12),
REG_OFFSET_NAME(r11),
REG_OFFSET_NAME(r10),
REG_OFFSET_NAME(r9),
REG_OFFSET_NAME(r8),
REG_OFFSET_NAME(r7),
REG_OFFSET_NAME(r6),
REG_OFFSET_NAME(r5),
REG_OFFSET_NAME(r4),
REG_OFFSET_NAME(r3),
REG_OFFSET_NAME(r2),
REG_OFFSET_NAME(r1),
REG_OFFSET_NAME(r0),
REG_OFFSET_NAME(sp),
REG_OFFSET_NAME(orig_r0),
REG_OFFSET_NAME(ecr),
REG_OFFSET_END,
};
#else
static const struct pt_regs_offset regoffset_table[] = {
REG_OFFSET_NAME(orig_r0),
REG_OFFSET_NAME(ecr),
REG_OFFSET_NAME(bta),
REG_OFFSET_NAME(r26),
REG_OFFSET_NAME(fp),
REG_OFFSET_NAME(sp),
REG_OFFSET_NAME(r12),
REG_OFFSET_NAME(r30),
#ifdef CONFIG_ARC_HAS_ACCL_REGS
REG_OFFSET_NAME(r58),
REG_OFFSET_NAME(r59),
#endif
#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
REG_OFFSET_NAME(DSP_CTRL),
#endif
REG_OFFSET_NAME(r0),
REG_OFFSET_NAME(r1),
REG_OFFSET_NAME(r2),
REG_OFFSET_NAME(r3),
REG_OFFSET_NAME(r4),
REG_OFFSET_NAME(r5),
REG_OFFSET_NAME(r6),
REG_OFFSET_NAME(r7),
REG_OFFSET_NAME(r8),
REG_OFFSET_NAME(r9),
REG_OFFSET_NAME(r10),
REG_OFFSET_NAME(r11),
REG_OFFSET_NAME(blink),
REG_OFFSET_NAME(lp_end),
REG_OFFSET_NAME(lp_start),
REG_OFFSET_NAME(lp_count),
REG_OFFSET_NAME(ei),
REG_OFFSET_NAME(ldi),
REG_OFFSET_NAME(jli),
REG_OFFSET_NAME(ret),
REG_OFFSET_NAME(status32),
REG_OFFSET_END,
};
#endif
static struct callee_regs *task_callee_regs(struct task_struct *tsk)
{
struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
return tmp;
}
static int genregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
const struct pt_regs *ptregs = task_pt_regs(target);
const struct callee_regs *cregs = task_callee_regs(target);
unsigned int stop_pc_val;
membuf_zero(&to, 4); // pad
membuf_store(&to, ptregs->bta);
membuf_store(&to, ptregs->lp_start);
membuf_store(&to, ptregs->lp_end);
membuf_store(&to, ptregs->lp_count);
membuf_store(&to, ptregs->status32);
membuf_store(&to, ptregs->ret);
membuf_store(&to, ptregs->blink);
membuf_store(&to, ptregs->fp);
membuf_store(&to, ptregs->r26); // gp
membuf_store(&to, ptregs->r12);
membuf_store(&to, ptregs->r11);
membuf_store(&to, ptregs->r10);
membuf_store(&to, ptregs->r9);
membuf_store(&to, ptregs->r8);
membuf_store(&to, ptregs->r7);
membuf_store(&to, ptregs->r6);
membuf_store(&to, ptregs->r5);
membuf_store(&to, ptregs->r4);
membuf_store(&to, ptregs->r3);
membuf_store(&to, ptregs->r2);
membuf_store(&to, ptregs->r1);
membuf_store(&to, ptregs->r0);
membuf_store(&to, ptregs->sp);
membuf_zero(&to, 4); // pad2
membuf_store(&to, cregs->r25);
membuf_store(&to, cregs->r24);
membuf_store(&to, cregs->r23);
membuf_store(&to, cregs->r22);
membuf_store(&to, cregs->r21);
membuf_store(&to, cregs->r20);
membuf_store(&to, cregs->r19);
membuf_store(&to, cregs->r18);
membuf_store(&to, cregs->r17);
membuf_store(&to, cregs->r16);
membuf_store(&to, cregs->r15);
membuf_store(&to, cregs->r14);
membuf_store(&to, cregs->r13);
membuf_store(&to, target->thread.fault_address); // efa
if (in_brkpt_trap(ptregs)) {
stop_pc_val = target->thread.fault_address;
pr_debug("\t\tstop_pc (brk-pt)\n");
} else {
stop_pc_val = ptregs->ret;
pr_debug("\t\tstop_pc (others)\n");
}
return membuf_store(&to, stop_pc_val); // stop_pc
}
static int genregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
const struct pt_regs *ptregs = task_pt_regs(target);
const struct callee_regs *cregs = task_callee_regs(target);
int ret = 0;
#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), \
offsetof(struct user_regs_struct, FIRST), \
offsetof(struct user_regs_struct, NEXT));
#define REG_IN_ONE(LOC, PTR) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), \
offsetof(struct user_regs_struct, LOC), \
offsetof(struct user_regs_struct, LOC) + 4);
#define REG_IGNORE_ONE(LOC) \
if (!ret) \
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
offsetof(struct user_regs_struct, LOC), \
offsetof(struct user_regs_struct, LOC) + 4);
REG_IGNORE_ONE(pad);
REG_IN_ONE(scratch.bta, &ptregs->bta);
REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);
REG_IGNORE_ONE(scratch.status32);
REG_IN_ONE(scratch.ret, &ptregs->ret);
REG_IN_ONE(scratch.blink, &ptregs->blink);
REG_IN_ONE(scratch.fp, &ptregs->fp);
REG_IN_ONE(scratch.gp, &ptregs->r26);
REG_IN_ONE(scratch.r12, &ptregs->r12);
REG_IN_ONE(scratch.r11, &ptregs->r11);
REG_IN_ONE(scratch.r10, &ptregs->r10);
REG_IN_ONE(scratch.r9, &ptregs->r9);
REG_IN_ONE(scratch.r8, &ptregs->r8);
REG_IN_ONE(scratch.r7, &ptregs->r7);
REG_IN_ONE(scratch.r6, &ptregs->r6);
REG_IN_ONE(scratch.r5, &ptregs->r5);
REG_IN_ONE(scratch.r4, &ptregs->r4);
REG_IN_ONE(scratch.r3, &ptregs->r3);
REG_IN_ONE(scratch.r2, &ptregs->r2);
REG_IN_ONE(scratch.r1, &ptregs->r1);
REG_IN_ONE(scratch.r0, &ptregs->r0);
REG_IN_ONE(scratch.sp, &ptregs->sp);
REG_IGNORE_ONE(pad2);
REG_IN_ONE(callee.r25, &cregs->r25);
REG_IN_ONE(callee.r24, &cregs->r24);
REG_IN_ONE(callee.r23, &cregs->r23);
REG_IN_ONE(callee.r22, &cregs->r22);
REG_IN_ONE(callee.r21, &cregs->r21);
REG_IN_ONE(callee.r20, &cregs->r20);
REG_IN_ONE(callee.r19, &cregs->r19);
REG_IN_ONE(callee.r18, &cregs->r18);
REG_IN_ONE(callee.r17, &cregs->r17);
REG_IN_ONE(callee.r16, &cregs->r16);
REG_IN_ONE(callee.r15, &cregs->r15);
REG_IN_ONE(callee.r14, &cregs->r14);
REG_IN_ONE(callee.r13, &cregs->r13);
REG_IGNORE_ONE(efa); /* efa update invalid */
REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */
return ret;
}
#ifdef CONFIG_ISA_ARCV2
static int arcv2regs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
const struct pt_regs *regs = task_pt_regs(target);
if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
/*
* itemized copy not needed like above as layout of regs (r30,r58,r59)
* is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2)
*/
return membuf_write(&to, ®s->r30, sizeof(struct user_regs_arcv2));
membuf_write(&to, ®s->r30, 4); /* r30 only */
return membuf_zero(&to, sizeof(struct user_regs_arcv2) - 4);
}
static int arcv2regs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
const struct pt_regs *regs = task_pt_regs(target);
int ret, copy_sz;
if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
copy_sz = sizeof(struct user_regs_arcv2);
else
copy_sz = 4; /* r30 only */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)®s->r30,
0, copy_sz);
return ret;
}
#endif
enum arc_getset {
REGSET_CMN,
REGSET_ARCV2,
};
static const struct user_regset arc_regsets[] = {
[REGSET_CMN] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(unsigned long),
.align = sizeof(unsigned long),
.regset_get = genregs_get,
.set = genregs_set,
},
#ifdef CONFIG_ISA_ARCV2
[REGSET_ARCV2] = {
.core_note_type = NT_ARC_V2,
.n = ELF_ARCV2REG,
.size = sizeof(unsigned long),
.align = sizeof(unsigned long),
.regset_get = arcv2regs_get,
.set = arcv2regs_set,
},
#endif
};
static const struct user_regset_view user_arc_view = {
.name = "arc",
.e_machine = EM_ARC_INUSE,
.regsets = arc_regsets,
.n = ARRAY_SIZE(arc_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_arc_view;
}
void ptrace_disable(struct task_struct *child)
{
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret = -EIO;
pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
switch (request) {
case PTRACE_GET_THREAD_AREA:
ret = put_user(task_thread_info(child)->thr_ptr,
(unsigned long __user *)data);
break;
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 (ptrace_report_syscall_entry(regs))
return ULONG_MAX;
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, syscall_get_nr(current, regs));
#endif
return regs->r8;
}
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
ptrace_report_syscall_exit(regs, 0);
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_exit(regs, regs_return_value(regs));
#endif
}
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;
}
const char *regs_query_register_name(unsigned int offset)
{
const struct pt_regs_offset *roff;
for (roff = regoffset_table; roff->name != NULL; roff++)
if (roff->offset == offset)
return roff->name;
return NULL;
}
bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
{
return (addr & ~(THREAD_SIZE - 1)) ==
(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1));
}
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;
}
