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