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Diffstat (limited to 'arch/sh/kernel/ptrace_64.c')
-rw-r--r--arch/sh/kernel/ptrace_64.c576
1 files changed, 0 insertions, 576 deletions
diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c
deleted file mode 100644
index 11085e48eaa6..000000000000
--- a/arch/sh/kernel/ptrace_64.c
+++ /dev/null
@@ -1,576 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * arch/sh/kernel/ptrace_64.c
- *
- * Copyright (C) 2000, 2001 Paolo Alberelli
- * Copyright (C) 2003 - 2008 Paul Mundt
- *
- * Started from SH3/4 version:
- * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
- *
- * Original x86 implementation:
- * By Ross Biro 1/23/92
- * edited by Linus Torvalds
- */
-#include <linux/kernel.h>
-#include <linux/rwsem.h>
-#include <linux/sched.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/signal.h>
-#include <linux/syscalls.h>
-#include <linux/audit.h>
-#include <linux/seccomp.h>
-#include <linux/tracehook.h>
-#include <linux/elf.h>
-#include <linux/regset.h>
-#include <asm/io.h>
-#include <linux/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/processor.h>
-#include <asm/mmu_context.h>
-#include <asm/syscalls.h>
-#include <asm/fpu.h>
-#include <asm/traps.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/syscalls.h>
-
-/* This mask defines the bits of the SR which the user is not allowed to
- change, which are everything except S, Q, M, PR, SZ, FR. */
-#define SR_MASK (0xffff8cfd)
-
-/*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
- */
-
-/*
- * This routine will get a word from the user area in the process kernel stack.
- */
-static inline int get_stack_long(struct task_struct *task, int offset)
-{
- unsigned char *stack;
-
- stack = (unsigned char *)(task->thread.uregs);
- stack += offset;
- return (*((int *)stack));
-}
-
-static inline unsigned long
-get_fpu_long(struct task_struct *task, unsigned long addr)
-{
- unsigned long tmp;
- struct pt_regs *regs;
- regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
-
- if (!tsk_used_math(task)) {
- if (addr == offsetof(struct user_fpu_struct, fpscr)) {
- tmp = FPSCR_INIT;
- } else {
- tmp = 0xffffffffUL; /* matches initial value in fpu.c */
- }
- return tmp;
- }
-
- if (last_task_used_math == task) {
- enable_fpu();
- save_fpu(task);
- disable_fpu();
- last_task_used_math = 0;
- regs->sr |= SR_FD;
- }
-
- tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
- return tmp;
-}
-
-/*
- * This routine will put a word into the user area in the process kernel stack.
- */
-static inline int put_stack_long(struct task_struct *task, int offset,
- unsigned long data)
-{
- unsigned char *stack;
-
- stack = (unsigned char *)(task->thread.uregs);
- stack += offset;
- *(unsigned long *) stack = data;
- return 0;
-}
-
-static inline int
-put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
-{
- struct pt_regs *regs;
-
- regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
-
- if (!tsk_used_math(task)) {
- init_fpu(task);
- } else if (last_task_used_math == task) {
- enable_fpu();
- save_fpu(task);
- disable_fpu();
- last_task_used_math = 0;
- regs->sr |= SR_FD;
- }
-
- ((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
- return 0;
-}
-
-void user_enable_single_step(struct task_struct *child)
-{
- struct pt_regs *regs = child->thread.uregs;
-
- regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
-
- set_tsk_thread_flag(child, TIF_SINGLESTEP);
-}
-
-void user_disable_single_step(struct task_struct *child)
-{
- struct pt_regs *regs = child->thread.uregs;
-
- regs->sr &= ~SR_SSTEP;
-
- clear_tsk_thread_flag(child, TIF_SINGLESTEP);
-}
-
-static int genregs_get(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
-{
- const struct pt_regs *regs = task_pt_regs(target);
- int ret;
-
- /* PC, SR, SYSCALL */
- ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- &regs->pc,
- 0, 3 * sizeof(unsigned long long));
-
- /* R1 -> R63 */
- if (!ret)
- ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- regs->regs,
- offsetof(struct pt_regs, regs[0]),
- 63 * sizeof(unsigned long long));
- /* TR0 -> TR7 */
- if (!ret)
- ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- regs->tregs,
- offsetof(struct pt_regs, tregs[0]),
- 8 * sizeof(unsigned long long));
-
- if (!ret)
- ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
- sizeof(struct pt_regs), -1);
-
- return ret;
-}
-
-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)
-{
- struct pt_regs *regs = task_pt_regs(target);
- int ret;
-
- /* PC, SR, SYSCALL */
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- &regs->pc,
- 0, 3 * sizeof(unsigned long long));
-
- /* R1 -> R63 */
- if (!ret && count > 0)
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- regs->regs,
- offsetof(struct pt_regs, regs[0]),
- 63 * sizeof(unsigned long long));
-
- /* TR0 -> TR7 */
- if (!ret && count > 0)
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- regs->tregs,
- offsetof(struct pt_regs, tregs[0]),
- 8 * sizeof(unsigned long long));
-
- if (!ret)
- ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
- sizeof(struct pt_regs), -1);
-
- return ret;
-}
-
-#ifdef CONFIG_SH_FPU
-int fpregs_get(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
-{
- int ret;
-
- ret = init_fpu(target);
- if (ret)
- return ret;
-
- return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- &target->thread.xstate->hardfpu, 0, -1);
-}
-
-static int fpregs_set(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- const void *kbuf, const void __user *ubuf)
-{
- int ret;
-
- ret = init_fpu(target);
- if (ret)
- return ret;
-
- set_stopped_child_used_math(target);
-
- return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- &target->thread.xstate->hardfpu, 0, -1);
-}
-
-static int fpregs_active(struct task_struct *target,
- const struct user_regset *regset)
-{
- return tsk_used_math(target) ? regset->n : 0;
-}
-#endif
-
-const struct pt_regs_offset regoffset_table[] = {
- REG_OFFSET_NAME(pc),
- REG_OFFSET_NAME(sr),
- REG_OFFSET_NAME(syscall_nr),
- REGS_OFFSET_NAME(0),
- REGS_OFFSET_NAME(1),
- REGS_OFFSET_NAME(2),
- REGS_OFFSET_NAME(3),
- REGS_OFFSET_NAME(4),
- REGS_OFFSET_NAME(5),
- REGS_OFFSET_NAME(6),
- REGS_OFFSET_NAME(7),
- REGS_OFFSET_NAME(8),
- REGS_OFFSET_NAME(9),
- REGS_OFFSET_NAME(10),
- REGS_OFFSET_NAME(11),
- REGS_OFFSET_NAME(12),
- REGS_OFFSET_NAME(13),
- REGS_OFFSET_NAME(14),
- REGS_OFFSET_NAME(15),
- REGS_OFFSET_NAME(16),
- REGS_OFFSET_NAME(17),
- REGS_OFFSET_NAME(18),
- REGS_OFFSET_NAME(19),
- REGS_OFFSET_NAME(20),
- REGS_OFFSET_NAME(21),
- REGS_OFFSET_NAME(22),
- REGS_OFFSET_NAME(23),
- REGS_OFFSET_NAME(24),
- REGS_OFFSET_NAME(25),
- REGS_OFFSET_NAME(26),
- REGS_OFFSET_NAME(27),
- REGS_OFFSET_NAME(28),
- REGS_OFFSET_NAME(29),
- REGS_OFFSET_NAME(30),
- REGS_OFFSET_NAME(31),
- REGS_OFFSET_NAME(32),
- REGS_OFFSET_NAME(33),
- REGS_OFFSET_NAME(34),
- REGS_OFFSET_NAME(35),
- REGS_OFFSET_NAME(36),
- REGS_OFFSET_NAME(37),
- REGS_OFFSET_NAME(38),
- REGS_OFFSET_NAME(39),
- REGS_OFFSET_NAME(40),
- REGS_OFFSET_NAME(41),
- REGS_OFFSET_NAME(42),
- REGS_OFFSET_NAME(43),
- REGS_OFFSET_NAME(44),
- REGS_OFFSET_NAME(45),
- REGS_OFFSET_NAME(46),
- REGS_OFFSET_NAME(47),
- REGS_OFFSET_NAME(48),
- REGS_OFFSET_NAME(49),
- REGS_OFFSET_NAME(50),
- REGS_OFFSET_NAME(51),
- REGS_OFFSET_NAME(52),
- REGS_OFFSET_NAME(53),
- REGS_OFFSET_NAME(54),
- REGS_OFFSET_NAME(55),
- REGS_OFFSET_NAME(56),
- REGS_OFFSET_NAME(57),
- REGS_OFFSET_NAME(58),
- REGS_OFFSET_NAME(59),
- REGS_OFFSET_NAME(60),
- REGS_OFFSET_NAME(61),
- REGS_OFFSET_NAME(62),
- REGS_OFFSET_NAME(63),
- TREGS_OFFSET_NAME(0),
- TREGS_OFFSET_NAME(1),
- TREGS_OFFSET_NAME(2),
- TREGS_OFFSET_NAME(3),
- TREGS_OFFSET_NAME(4),
- TREGS_OFFSET_NAME(5),
- TREGS_OFFSET_NAME(6),
- TREGS_OFFSET_NAME(7),
- REG_OFFSET_END,
-};
-
-/*
- * These are our native regset flavours.
- */
-enum sh_regset {
- REGSET_GENERAL,
-#ifdef CONFIG_SH_FPU
- REGSET_FPU,
-#endif
-};
-
-static const struct user_regset sh_regsets[] = {
- /*
- * Format is:
- * PC, SR, SYSCALL,
- * R1 --> R63,
- * TR0 --> TR7,
- */
- [REGSET_GENERAL] = {
- .core_note_type = NT_PRSTATUS,
- .n = ELF_NGREG,
- .size = sizeof(long long),
- .align = sizeof(long long),
- .get = genregs_get,
- .set = genregs_set,
- },
-
-#ifdef CONFIG_SH_FPU
- [REGSET_FPU] = {
- .core_note_type = NT_PRFPREG,
- .n = sizeof(struct user_fpu_struct) /
- sizeof(long long),
- .size = sizeof(long long),
- .align = sizeof(long long),
- .get = fpregs_get,
- .set = fpregs_set,
- .active = fpregs_active,
- },
-#endif
-};
-
-static const struct user_regset_view user_sh64_native_view = {
- .name = "sh64",
- .e_machine = EM_SH,
- .regsets = sh_regsets,
- .n = ARRAY_SIZE(sh_regsets),
-};
-
-const struct user_regset_view *task_user_regset_view(struct task_struct *task)
-{
- return &user_sh64_native_view;
-}
-
-long arch_ptrace(struct task_struct *child, long request,
- unsigned long addr, unsigned long data)
-{
- int ret;
- unsigned long __user *datap = (unsigned long __user *) data;
-
- switch (request) {
- /* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
-
- ret = -EIO;
- if ((addr & 3) || addr < 0)
- break;
-
- if (addr < sizeof(struct pt_regs))
- tmp = get_stack_long(child, addr);
- else if ((addr >= offsetof(struct user, fpu)) &&
- (addr < offsetof(struct user, u_fpvalid))) {
- unsigned long index;
- ret = init_fpu(child);
- if (ret)
- break;
- index = addr - offsetof(struct user, fpu);
- tmp = get_fpu_long(child, index);
- } else if (addr == offsetof(struct user, u_fpvalid)) {
- tmp = !!tsk_used_math(child);
- } else {
- break;
- }
- ret = put_user(tmp, datap);
- break;
- }
-
- case PTRACE_POKEUSR:
- /* write the word at location addr in the USER area. We must
- disallow any changes to certain SR bits or u_fpvalid, since
- this could crash the kernel or result in a security
- loophole. */
- ret = -EIO;
- if ((addr & 3) || addr < 0)
- break;
-
- if (addr < sizeof(struct pt_regs)) {
- /* Ignore change of top 32 bits of SR */
- if (addr == offsetof (struct pt_regs, sr)+4)
- {
- ret = 0;
- break;
- }
- /* If lower 32 bits of SR, ignore non-user bits */
- if (addr == offsetof (struct pt_regs, sr))
- {
- long cursr = get_stack_long(child, addr);
- data &= ~(SR_MASK);
- data |= (cursr & SR_MASK);
- }
- ret = put_stack_long(child, addr, data);
- }
- else if ((addr >= offsetof(struct user, fpu)) &&
- (addr < offsetof(struct user, u_fpvalid))) {
- unsigned long index;
- ret = init_fpu(child);
- if (ret)
- break;
- index = addr - offsetof(struct user, fpu);
- ret = put_fpu_long(child, index, data);
- }
- break;
-
- case PTRACE_GETREGS:
- return copy_regset_to_user(child, &user_sh64_native_view,
- REGSET_GENERAL,
- 0, sizeof(struct pt_regs),
- datap);
- case PTRACE_SETREGS:
- return copy_regset_from_user(child, &user_sh64_native_view,
- REGSET_GENERAL,
- 0, sizeof(struct pt_regs),
- datap);
-#ifdef CONFIG_SH_FPU
- case PTRACE_GETFPREGS:
- return copy_regset_to_user(child, &user_sh64_native_view,
- REGSET_FPU,
- 0, sizeof(struct user_fpu_struct),
- datap);
- case PTRACE_SETFPREGS:
- return copy_regset_from_user(child, &user_sh64_native_view,
- REGSET_FPU,
- 0, sizeof(struct user_fpu_struct),
- datap);
-#endif
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
-
- return ret;
-}
-
-asmlinkage int sh64_ptrace(long request, long pid,
- unsigned long addr, unsigned long data)
-{
-#define WPC_DBRMODE 0x0d104008
- static unsigned long first_call;
-
- if (!test_and_set_bit(0, &first_call)) {
- /* Set WPC.DBRMODE to 0. This makes all debug events get
- * delivered through RESVEC, i.e. into the handlers in entry.S.
- * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
- * would normally be left set to 1, which makes debug events get
- * delivered through DBRVEC, i.e. into the remote gdb's
- * handlers. This prevents ptrace getting them, and confuses
- * the remote gdb.) */
- printk("DBRMODE set to 0 to permit native debugging\n");
- poke_real_address_q(WPC_DBRMODE, 0);
- }
-
- return sys_ptrace(request, pid, addr, data);
-}
-
-asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
-{
- long long ret = 0;
-
- secure_computing_strict(regs->regs[9]);
-
- if (test_thread_flag(TIF_SYSCALL_TRACE) &&
- tracehook_report_syscall_entry(regs))
- /*
- * Tracing decided this syscall should not happen.
- * We'll return a bogus call number to get an ENOSYS
- * error, but leave the original number in regs->regs[0].
- */
- ret = -1LL;
-
- if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
- trace_sys_enter(regs, regs->regs[9]);
-
- audit_syscall_entry(regs->regs[1], regs->regs[2], regs->regs[3],
- regs->regs[4], regs->regs[5]);
-
- return ret ?: regs->regs[9];
-}
-
-asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
-{
- int step;
-
- audit_syscall_exit(regs);
-
- if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
- trace_sys_exit(regs, regs->regs[9]);
-
- step = test_thread_flag(TIF_SINGLESTEP);
- if (step || test_thread_flag(TIF_SYSCALL_TRACE))
- tracehook_report_syscall_exit(regs, step);
-}
-
-/* Called with interrupts disabled */
-asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
-{
- /* This is called after a single step exception (DEBUGSS).
- There is no need to change the PC, as it is a post-execution
- exception, as entry.S does not do anything to the PC for DEBUGSS.
- We need to clear the Single Step setting in SR to avoid
- continually stepping. */
- local_irq_enable();
- regs->sr &= ~SR_SSTEP;
- force_sig(SIGTRAP);
-}
-
-/* Called with interrupts disabled */
-BUILD_TRAP_HANDLER(breakpoint)
-{
- TRAP_HANDLER_DECL;
-
- /* We need to forward step the PC, to counteract the backstep done
- in signal.c. */
- local_irq_enable();
- force_sig(SIGTRAP);
- regs->pc += 4;
-}
-
-/*
- * Called by kernel/ptrace.c when detaching..
- *
- * Make sure single step bits etc are not set.
- */
-void ptrace_disable(struct task_struct *child)
-{
- user_disable_single_step(child);
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.