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Diffstat (limited to 'arch/cris/arch-v32/kernel/ptrace.c')
-rw-r--r--arch/cris/arch-v32/kernel/ptrace.c492
1 files changed, 0 insertions, 492 deletions
diff --git a/arch/cris/arch-v32/kernel/ptrace.c b/arch/cris/arch-v32/kernel/ptrace.c
deleted file mode 100644
index ccac1aaadc8a..000000000000
--- a/arch/cris/arch-v32/kernel/ptrace.c
+++ /dev/null
@@ -1,492 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2000-2007, Axis Communications AB.
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/errno.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/signal.h>
-#include <linux/security.h>
-
-#include <linux/uaccess.h>
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/processor.h>
-#include <arch/hwregs/supp_reg.h>
-
-/*
- * Determines which bits in CCS the user has access to.
- * 1 = access, 0 = no access.
- */
-#define CCS_MASK 0x00087c00 /* SXNZVC */
-
-#define SBIT_USER (1 << (S_CCS_BITNR + CCS_SHIFT))
-
-static int put_debugreg(long pid, unsigned int regno, long data);
-static long get_debugreg(long pid, unsigned int regno);
-static unsigned long get_pseudo_pc(struct task_struct *child);
-void deconfigure_bp(long pid);
-
-extern unsigned long cris_signal_return_page;
-
-/*
- * Get contents of register REGNO in task TASK.
- */
-long get_reg(struct task_struct *task, unsigned int regno)
-{
- /* USP is a special case, it's not in the pt_regs struct but
- * in the tasks thread struct
- */
- unsigned long ret;
-
- if (regno <= PT_EDA)
- ret = ((unsigned long *)task_pt_regs(task))[regno];
- else if (regno == PT_USP)
- ret = task->thread.usp;
- else if (regno == PT_PPC)
- ret = get_pseudo_pc(task);
- else if (regno <= PT_MAX)
- ret = get_debugreg(task->pid, regno);
- else
- ret = 0;
-
- return ret;
-}
-
-/*
- * Write contents of register REGNO in task TASK.
- */
-int put_reg(struct task_struct *task, unsigned int regno, unsigned long data)
-{
- if (regno <= PT_EDA)
- ((unsigned long *)task_pt_regs(task))[regno] = data;
- else if (regno == PT_USP)
- task->thread.usp = data;
- else if (regno == PT_PPC) {
- /* Write pseudo-PC to ERP only if changed. */
- if (data != get_pseudo_pc(task))
- task_pt_regs(task)->erp = data;
- } else if (regno <= PT_MAX)
- return put_debugreg(task->pid, regno, data);
- else
- return -1;
- return 0;
-}
-
-void user_enable_single_step(struct task_struct *child)
-{
- unsigned long tmp;
-
- /*
- * Set up SPC if not set already (in which case we have no other
- * choice but to trust it).
- */
- if (!get_reg(child, PT_SPC)) {
- /* In case we're stopped in a delay slot. */
- tmp = get_reg(child, PT_ERP) & ~1;
- put_reg(child, PT_SPC, tmp);
- }
- tmp = get_reg(child, PT_CCS) | SBIT_USER;
- put_reg(child, PT_CCS, tmp);
-}
-
-void user_disable_single_step(struct task_struct *child)
-{
- put_reg(child, PT_SPC, 0);
-
- if (!get_debugreg(child->pid, PT_BP_CTRL)) {
- unsigned long tmp;
- /* If no h/w bp configured, disable S bit. */
- tmp = get_reg(child, PT_CCS) & ~SBIT_USER;
- put_reg(child, PT_CCS, tmp);
- }
-}
-
-/*
- * Called by kernel/ptrace.c when detaching.
- *
- * Make sure the single step bit is not set.
- */
-void
-ptrace_disable(struct task_struct *child)
-{
- /* Deconfigure SPC and S-bit. */
- user_disable_single_step(child);
- put_reg(child, PT_SPC, 0);
-
- /* Deconfigure any watchpoints associated with the child. */
- deconfigure_bp(child->pid);
-}
-
-
-long arch_ptrace(struct task_struct *child, long request,
- unsigned long addr, unsigned long data)
-{
- int ret;
- unsigned int regno = addr >> 2;
- unsigned long __user *datap = (unsigned long __user *)data;
-
- switch (request) {
- /* Read word at location address. */
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA: {
- unsigned long tmp;
- int copied;
-
- ret = -EIO;
-
- /* The signal trampoline page is outside the normal user-addressable
- * space but still accessible. This is hack to make it possible to
- * access the signal handler code in GDB.
- */
- if ((addr & PAGE_MASK) == cris_signal_return_page) {
- /* The trampoline page is globally mapped, no page table to traverse.*/
- tmp = *(unsigned long*)addr;
- } else {
- copied = ptrace_access_vm(child, addr, &tmp, sizeof(tmp), FOLL_FORCE);
-
- if (copied != sizeof(tmp))
- break;
- }
-
- ret = put_user(tmp,datap);
- break;
- }
-
- /* Read the word at location address in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
-
- ret = -EIO;
- if ((addr & 3) || regno > PT_MAX)
- break;
-
- tmp = get_reg(child, regno);
- ret = put_user(tmp, datap);
- break;
- }
-
- /* Write the word at location address. */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
- /* Write the word at location address in the USER area. */
- case PTRACE_POKEUSR:
- ret = -EIO;
- if ((addr & 3) || regno > PT_MAX)
- break;
-
- if (regno == PT_CCS) {
- /* don't allow the tracing process to change stuff like
- * interrupt enable, kernel/user bit, dma enables etc.
- */
- data &= CCS_MASK;
- data |= get_reg(child, PT_CCS) & ~CCS_MASK;
- }
- if (put_reg(child, regno, data))
- break;
- ret = 0;
- break;
-
- /* Get all GP registers from the child. */
- case PTRACE_GETREGS: {
- int i;
- unsigned long tmp;
-
- for (i = 0; i <= PT_MAX; i++) {
- tmp = get_reg(child, i);
-
- if (put_user(tmp, datap)) {
- ret = -EFAULT;
- goto out_tsk;
- }
-
- datap++;
- }
-
- ret = 0;
- break;
- }
-
- /* Set all GP registers in the child. */
- case PTRACE_SETREGS: {
- int i;
- unsigned long tmp;
-
- for (i = 0; i <= PT_MAX; i++) {
- if (get_user(tmp, datap)) {
- ret = -EFAULT;
- goto out_tsk;
- }
-
- if (i == PT_CCS) {
- tmp &= CCS_MASK;
- tmp |= get_reg(child, PT_CCS) & ~CCS_MASK;
- }
-
- put_reg(child, i, tmp);
- datap++;
- }
-
- ret = 0;
- break;
- }
-
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
-
-out_tsk:
- return ret;
-}
-
-void do_syscall_trace(void)
-{
- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- return;
-
- if (!(current->ptrace & PT_PTRACED))
- return;
-
- /* the 0x80 provides a way for the tracing parent to distinguish
- between a syscall stop and SIGTRAP delivery */
- ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
- ? 0x80 : 0));
-
- /*
- * This isn't the same as continuing with a signal, but it will do for
- * normal use.
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
-}
-
-/* Returns the size of an instruction that has a delay slot. */
-
-static int insn_size(struct task_struct *child, unsigned long pc)
-{
- unsigned long opcode;
- int copied;
- int opsize = 0;
-
- /* Read the opcode at pc (do what PTRACE_PEEKTEXT would do). */
- copied = access_process_vm(child, pc, &opcode, sizeof(opcode), FOLL_FORCE);
- if (copied != sizeof(opcode))
- return 0;
-
- switch ((opcode & 0x0f00) >> 8) {
- case 0x0:
- case 0x9:
- case 0xb:
- opsize = 2;
- break;
- case 0xe:
- case 0xf:
- opsize = 6;
- break;
- case 0xd:
- /* Could be 4 or 6; check more bits. */
- if ((opcode & 0xff) == 0xff)
- opsize = 4;
- else
- opsize = 6;
- break;
- default:
- panic("ERROR: Couldn't find size of opcode 0x%lx at 0x%lx\n",
- opcode, pc);
- }
-
- return opsize;
-}
-
-static unsigned long get_pseudo_pc(struct task_struct *child)
-{
- /* Default value for PC is ERP. */
- unsigned long pc = get_reg(child, PT_ERP);
-
- if (pc & 0x1) {
- unsigned long spc = get_reg(child, PT_SPC);
- /* Delay slot bit set. Report as stopped on proper
- instruction. */
- if (spc) {
- /* Rely on SPC if set. FIXME: We might want to check
- that EXS indicates we stopped due to a single-step
- exception. */
- pc = spc;
- } else {
- /* Calculate the PC from the size of the instruction
- that the delay slot we're in belongs to. */
- pc += insn_size(child, pc & ~1) - 1;
- }
- }
- return pc;
-}
-
-static long bp_owner = 0;
-
-/* Reachable from exit_thread in signal.c, so not static. */
-void deconfigure_bp(long pid)
-{
- int bp;
-
- /* Only deconfigure if the pid is the owner. */
- if (bp_owner != pid)
- return;
-
- for (bp = 0; bp < 6; bp++) {
- unsigned long tmp;
- /* Deconfigure start and end address (also gets rid of ownership). */
- put_debugreg(pid, PT_BP + 3 + (bp * 2), 0);
- put_debugreg(pid, PT_BP + 4 + (bp * 2), 0);
-
- /* Deconfigure relevant bits in control register. */
- tmp = get_debugreg(pid, PT_BP_CTRL) & ~(3 << (2 + (bp * 4)));
- put_debugreg(pid, PT_BP_CTRL, tmp);
- }
- /* No owner now. */
- bp_owner = 0;
-}
-
-static int put_debugreg(long pid, unsigned int regno, long data)
-{
- int ret = 0;
- register int old_srs;
-
-#ifdef CONFIG_ETRAX_KGDB
- /* Ignore write, but pretend it was ok if value is 0
- (we don't want POKEUSR/SETREGS failing unnessecarily). */
- return (data == 0) ? ret : -1;
-#endif
-
- /* Simple owner management. */
- if (!bp_owner)
- bp_owner = pid;
- else if (bp_owner != pid) {
- /* Ignore write, but pretend it was ok if value is 0
- (we don't want POKEUSR/SETREGS failing unnessecarily). */
- return (data == 0) ? ret : -1;
- }
-
- /* Remember old SRS. */
- SPEC_REG_RD(SPEC_REG_SRS, old_srs);
- /* Switch to BP bank. */
- SUPP_BANK_SEL(BANK_BP);
-
- switch (regno - PT_BP) {
- case 0:
- SUPP_REG_WR(0, data); break;
- case 1:
- case 2:
- if (data)
- ret = -1;
- break;
- case 3:
- SUPP_REG_WR(3, data); break;
- case 4:
- SUPP_REG_WR(4, data); break;
- case 5:
- SUPP_REG_WR(5, data); break;
- case 6:
- SUPP_REG_WR(6, data); break;
- case 7:
- SUPP_REG_WR(7, data); break;
- case 8:
- SUPP_REG_WR(8, data); break;
- case 9:
- SUPP_REG_WR(9, data); break;
- case 10:
- SUPP_REG_WR(10, data); break;
- case 11:
- SUPP_REG_WR(11, data); break;
- case 12:
- SUPP_REG_WR(12, data); break;
- case 13:
- SUPP_REG_WR(13, data); break;
- case 14:
- SUPP_REG_WR(14, data); break;
- default:
- ret = -1;
- break;
- }
-
- /* Restore SRS. */
- SPEC_REG_WR(SPEC_REG_SRS, old_srs);
- /* Just for show. */
- NOP();
- NOP();
- NOP();
-
- return ret;
-}
-
-static long get_debugreg(long pid, unsigned int regno)
-{
- register int old_srs;
- register long data;
-
- if (pid != bp_owner) {
- return 0;
- }
-
- /* Remember old SRS. */
- SPEC_REG_RD(SPEC_REG_SRS, old_srs);
- /* Switch to BP bank. */
- SUPP_BANK_SEL(BANK_BP);
-
- switch (regno - PT_BP) {
- case 0:
- SUPP_REG_RD(0, data); break;
- case 1:
- case 2:
- /* error return value? */
- data = 0;
- break;
- case 3:
- SUPP_REG_RD(3, data); break;
- case 4:
- SUPP_REG_RD(4, data); break;
- case 5:
- SUPP_REG_RD(5, data); break;
- case 6:
- SUPP_REG_RD(6, data); break;
- case 7:
- SUPP_REG_RD(7, data); break;
- case 8:
- SUPP_REG_RD(8, data); break;
- case 9:
- SUPP_REG_RD(9, data); break;
- case 10:
- SUPP_REG_RD(10, data); break;
- case 11:
- SUPP_REG_RD(11, data); break;
- case 12:
- SUPP_REG_RD(12, data); break;
- case 13:
- SUPP_REG_RD(13, data); break;
- case 14:
- SUPP_REG_RD(14, data); break;
- default:
- /* error return value? */
- data = 0;
- }
-
- /* Restore SRS. */
- SPEC_REG_WR(SPEC_REG_SRS, old_srs);
- /* Just for show. */
- NOP();
- NOP();
- NOP();
-
- return data;
-}
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