| // 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(event), |
| REG_OFFSET_NAME(user_r25), |
| REG_OFFSET_END, |
| }; |
| |
| #else |
| |
| static const struct pt_regs_offset regoffset_table[] = { |
| REG_OFFSET_NAME(orig_r0), |
| REG_OFFSET_NAME(event), |
| REG_OFFSET_NAME(bta), |
| REG_OFFSET_NAME(user_r25), |
| 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) \ |
| 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_entry(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; |
| } |