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306 lines
8.4 KiB
C
306 lines
8.4 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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unsigned int pos, unsigned int count,
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void *kbuf, 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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unsigned int stop_pc_val;
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#define REG_O_CHUNK(START, END, PTR) \
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if (!ret) \
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
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offsetof(struct user_regs_struct, START), \
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offsetof(struct user_regs_struct, END));
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#define REG_O_ONE(LOC, PTR) \
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if (!ret) \
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, 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_O_ZERO(LOC) \
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if (!ret) \
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ret = user_regset_copyout_zero(&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_O_ZERO(pad);
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REG_O_ONE(scratch.bta, &ptregs->bta);
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REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
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REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
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REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
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REG_O_ONE(scratch.status32, &ptregs->status32);
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REG_O_ONE(scratch.ret, &ptregs->ret);
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REG_O_ONE(scratch.blink, &ptregs->blink);
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REG_O_ONE(scratch.fp, &ptregs->fp);
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REG_O_ONE(scratch.gp, &ptregs->r26);
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REG_O_ONE(scratch.r12, &ptregs->r12);
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REG_O_ONE(scratch.r11, &ptregs->r11);
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REG_O_ONE(scratch.r10, &ptregs->r10);
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REG_O_ONE(scratch.r9, &ptregs->r9);
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REG_O_ONE(scratch.r8, &ptregs->r8);
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REG_O_ONE(scratch.r7, &ptregs->r7);
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REG_O_ONE(scratch.r6, &ptregs->r6);
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REG_O_ONE(scratch.r5, &ptregs->r5);
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REG_O_ONE(scratch.r4, &ptregs->r4);
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REG_O_ONE(scratch.r3, &ptregs->r3);
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REG_O_ONE(scratch.r2, &ptregs->r2);
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REG_O_ONE(scratch.r1, &ptregs->r1);
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REG_O_ONE(scratch.r0, &ptregs->r0);
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REG_O_ONE(scratch.sp, &ptregs->sp);
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REG_O_ZERO(pad2);
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REG_O_ONE(callee.r25, &cregs->r25);
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REG_O_ONE(callee.r24, &cregs->r24);
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REG_O_ONE(callee.r23, &cregs->r23);
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REG_O_ONE(callee.r22, &cregs->r22);
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REG_O_ONE(callee.r21, &cregs->r21);
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REG_O_ONE(callee.r20, &cregs->r20);
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REG_O_ONE(callee.r19, &cregs->r19);
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REG_O_ONE(callee.r18, &cregs->r18);
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REG_O_ONE(callee.r17, &cregs->r17);
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REG_O_ONE(callee.r16, &cregs->r16);
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REG_O_ONE(callee.r15, &cregs->r15);
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REG_O_ONE(callee.r14, &cregs->r14);
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REG_O_ONE(callee.r13, &cregs->r13);
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REG_O_ONE(efa, &target->thread.fault_address);
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if (!ret) {
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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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REG_O_ONE(stop_pc, &stop_pc_val);
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}
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return ret;
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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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unsigned int pos, unsigned int count,
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void *kbuf, 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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/*
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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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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, ®s->r30,
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0, copy_sz);
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return ret;
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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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.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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.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 = UTS_MACHINE,
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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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