400 lines
10 KiB
C
400 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/audit.h>
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#include <linux/elf.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ptrace.h>
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#include <linux/regset.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/signal.h>
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#include <linux/smp.h>
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#include <linux/tracehook.h>
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#include <linux/uaccess.h>
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#include <linux/user.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/asm-offsets.h>
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#include <abi/regdef.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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/* sets the trace bits. */
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#define TRACE_MODE_SI (1 << 14)
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#define TRACE_MODE_RUN 0
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#define TRACE_MODE_MASK ~(0x3 << 14)
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/*
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* Make sure the single step bit is not set.
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*/
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static void singlestep_disable(struct task_struct *tsk)
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{
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struct pt_regs *regs;
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regs = task_pt_regs(tsk);
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regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;
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/* Enable irq */
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regs->sr |= BIT(6);
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}
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static void singlestep_enable(struct task_struct *tsk)
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{
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struct pt_regs *regs;
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regs = task_pt_regs(tsk);
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regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;
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/* Disable irq */
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regs->sr &= ~BIT(6);
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}
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/*
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* Make sure the single step bit is set.
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*/
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void user_enable_single_step(struct task_struct *child)
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{
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singlestep_enable(child);
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}
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void user_disable_single_step(struct task_struct *child)
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{
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singlestep_disable(child);
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}
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enum csky_regset {
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REGSET_GPR,
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REGSET_FPR,
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};
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static int gpr_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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struct pt_regs *regs = task_pt_regs(target);
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/* Abiv1 regs->tls is fake and we need sync here. */
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regs->tls = task_thread_info(target)->tp_value;
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return membuf_write(&to, regs, sizeof(regs));
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}
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static int gpr_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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int ret;
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struct pt_regs regs;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0, -1);
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if (ret)
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return ret;
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regs.sr = task_pt_regs(target)->sr;
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#ifdef CONFIG_CPU_HAS_HILO
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regs.dcsr = task_pt_regs(target)->dcsr;
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#endif
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task_thread_info(target)->tp_value = regs.tls;
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*task_pt_regs(target) = regs;
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return 0;
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}
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static int fpr_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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struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
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#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
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int i;
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struct user_fp tmp = *regs;
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for (i = 0; i < 16; i++) {
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tmp.vr[i*4] = regs->vr[i*2];
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tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];
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}
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for (i = 0; i < 32; i++)
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tmp.vr[64 + i] = regs->vr[32 + i];
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return membuf_write(&to, &tmp, sizeof(tmp));
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#else
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return membuf_write(&to, regs, sizeof(*regs));
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#endif
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}
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static int fpr_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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int ret;
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struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
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#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
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int i;
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struct user_fp tmp;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
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*regs = tmp;
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for (i = 0; i < 16; i++) {
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regs->vr[i*2] = tmp.vr[i*4];
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regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];
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}
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for (i = 0; i < 32; i++)
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regs->vr[32 + i] = tmp.vr[64 + i];
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#else
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
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#endif
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return ret;
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}
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static const struct user_regset csky_regsets[] = {
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[REGSET_GPR] = {
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.core_note_type = NT_PRSTATUS,
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.n = sizeof(struct pt_regs) / sizeof(u32),
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.size = sizeof(u32),
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.align = sizeof(u32),
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.regset_get = gpr_get,
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.set = gpr_set,
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},
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[REGSET_FPR] = {
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.core_note_type = NT_PRFPREG,
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.n = sizeof(struct user_fp) / sizeof(u32),
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.size = sizeof(u32),
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.align = sizeof(u32),
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.regset_get = fpr_get,
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.set = fpr_set,
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},
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};
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static const struct user_regset_view user_csky_view = {
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.name = "csky",
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.e_machine = ELF_ARCH,
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.regsets = csky_regsets,
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.n = ARRAY_SIZE(csky_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_csky_view;
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}
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struct pt_regs_offset {
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const char *name;
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int offset;
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};
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#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
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#define REG_OFFSET_END {.name = NULL, .offset = 0}
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static const struct pt_regs_offset regoffset_table[] = {
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REG_OFFSET_NAME(tls),
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REG_OFFSET_NAME(lr),
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REG_OFFSET_NAME(pc),
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REG_OFFSET_NAME(sr),
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REG_OFFSET_NAME(usp),
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REG_OFFSET_NAME(orig_a0),
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REG_OFFSET_NAME(a0),
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REG_OFFSET_NAME(a1),
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REG_OFFSET_NAME(a2),
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REG_OFFSET_NAME(a3),
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REG_OFFSET_NAME(regs[0]),
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REG_OFFSET_NAME(regs[1]),
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REG_OFFSET_NAME(regs[2]),
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REG_OFFSET_NAME(regs[3]),
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REG_OFFSET_NAME(regs[4]),
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REG_OFFSET_NAME(regs[5]),
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REG_OFFSET_NAME(regs[6]),
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REG_OFFSET_NAME(regs[7]),
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REG_OFFSET_NAME(regs[8]),
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REG_OFFSET_NAME(regs[9]),
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#if defined(__CSKYABIV2__)
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REG_OFFSET_NAME(exregs[0]),
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REG_OFFSET_NAME(exregs[1]),
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REG_OFFSET_NAME(exregs[2]),
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REG_OFFSET_NAME(exregs[3]),
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REG_OFFSET_NAME(exregs[4]),
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REG_OFFSET_NAME(exregs[5]),
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REG_OFFSET_NAME(exregs[6]),
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REG_OFFSET_NAME(exregs[7]),
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REG_OFFSET_NAME(exregs[8]),
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REG_OFFSET_NAME(exregs[9]),
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REG_OFFSET_NAME(exregs[10]),
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REG_OFFSET_NAME(exregs[11]),
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REG_OFFSET_NAME(exregs[12]),
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REG_OFFSET_NAME(exregs[13]),
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REG_OFFSET_NAME(exregs[14]),
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REG_OFFSET_NAME(rhi),
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REG_OFFSET_NAME(rlo),
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REG_OFFSET_NAME(dcsr),
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#endif
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REG_OFFSET_END,
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};
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/**
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* regs_query_register_offset() - query register offset from its name
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* @name: the name of a register
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*
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* regs_query_register_offset() returns the offset of a register in struct
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* pt_regs from its name. If the name is invalid, this returns -EINVAL;
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*/
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int regs_query_register_offset(const char *name)
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{
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const struct pt_regs_offset *roff;
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for (roff = regoffset_table; roff->name != NULL; roff++)
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if (!strcmp(roff->name, name))
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return roff->offset;
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return -EINVAL;
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}
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/**
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* regs_within_kernel_stack() - check the address in the stack
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* @regs: pt_regs which contains kernel stack pointer.
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* @addr: address which is checked.
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*
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* regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
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* If @addr is within the kernel stack, it returns true. If not, returns false.
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*/
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static bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
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{
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return (addr & ~(THREAD_SIZE - 1)) ==
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(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1));
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}
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/**
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* regs_get_kernel_stack_nth() - get Nth entry of the stack
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* @regs: pt_regs which contains kernel stack pointer.
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* @n: stack entry number.
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*
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* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
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* is specified by @regs. If the @n th entry is NOT in the kernel stack,
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* this returns 0.
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*/
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unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
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{
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unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
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addr += n;
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if (regs_within_kernel_stack(regs, (unsigned long)addr))
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return *addr;
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else
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return 0;
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}
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void ptrace_disable(struct task_struct *child)
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{
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singlestep_disable(child);
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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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long ret = -EIO;
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switch (request) {
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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_enter(struct pt_regs *regs)
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{
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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if (tracehook_report_syscall_entry(regs))
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return -1;
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if (secure_computing() == -1)
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return -1;
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if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
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trace_sys_enter(regs, syscall_get_nr(current, regs));
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audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
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return 0;
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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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audit_syscall_exit(regs);
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, 0);
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if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
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trace_sys_exit(regs, syscall_get_return_value(current, regs));
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}
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void show_regs(struct pt_regs *fp)
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{
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pr_info("\nCURRENT PROCESS:\n\n");
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pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
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if (current->mm) {
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pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
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(int) current->mm->start_code,
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(int) current->mm->end_code,
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(int) current->mm->start_data,
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(int) current->mm->end_data,
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(int) current->mm->end_data,
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(int) current->mm->brk);
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pr_info("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
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(int) current->mm->start_stack,
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(int) (((unsigned long) current) + 2 * PAGE_SIZE));
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}
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pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
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pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
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pr_info("SP: 0x%08lx\n", (long)fp);
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pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
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pr_info("PSR: 0x%08lx\n", (long)fp->sr);
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pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
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fp->a0, fp->a1, fp->a2, fp->a3);
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#if defined(__CSKYABIV2__)
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pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
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fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
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pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
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fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
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pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
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fp->regs[8], fp->regs[9], fp->lr);
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pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
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fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
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pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
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fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
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pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
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fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
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pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
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fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
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pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
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fp->rhi, fp->rlo);
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#else
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pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
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fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
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pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
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fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
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pr_info("r14: 0x%08lx r1: 0x%08lx\n",
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fp->regs[8], fp->regs[9]);
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#endif
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return;
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}
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