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-rw-r--r--arch/tile/kernel/ptrace.c316
1 files changed, 0 insertions, 316 deletions
diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c
deleted file mode 100644
index d516d61751c2..000000000000
--- a/arch/tile/kernel/ptrace.c
+++ /dev/null
@@ -1,316 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- *
- * Copied from i386: Ross Biro 1/23/92
- */
-
-#include <linux/kernel.h>
-#include <linux/ptrace.h>
-#include <linux/kprobes.h>
-#include <linux/compat.h>
-#include <linux/uaccess.h>
-#include <linux/regset.h>
-#include <linux/elf.h>
-#include <linux/tracehook.h>
-#include <linux/context_tracking.h>
-#include <linux/sched/task_stack.h>
-
-#include <asm/traps.h>
-#include <arch/chip.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/syscalls.h>
-
-void user_enable_single_step(struct task_struct *child)
-{
- set_tsk_thread_flag(child, TIF_SINGLESTEP);
-}
-
-void user_disable_single_step(struct task_struct *child)
-{
- clear_tsk_thread_flag(child, TIF_SINGLESTEP);
-}
-
-/*
- * Called by kernel/ptrace.c when detaching..
- */
-void ptrace_disable(struct task_struct *child)
-{
- clear_tsk_thread_flag(child, TIF_SINGLESTEP);
-
- /*
- * These two are currently unused, but will be set by arch_ptrace()
- * and used in the syscall assembly when we do support them.
- */
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
-}
-
-/*
- * Get registers from task and ready the result for userspace.
- * Note that we localize the API issues to getregs() and putregs() at
- * some cost in performance, e.g. we need a full pt_regs copy for
- * PEEKUSR, and two copies for POKEUSR. But in general we expect
- * GETREGS/PUTREGS to be the API of choice anyway.
- */
-static char *getregs(struct task_struct *child, struct pt_regs *uregs)
-{
- *uregs = *task_pt_regs(child);
-
- /* Set up flags ABI bits. */
- uregs->flags = 0;
-#ifdef CONFIG_COMPAT
- if (task_thread_info(child)->status & TS_COMPAT)
- uregs->flags |= PT_FLAGS_COMPAT;
-#endif
-
- return (char *)uregs;
-}
-
-/* Put registers back to task. */
-static void putregs(struct task_struct *child, struct pt_regs *uregs)
-{
- struct pt_regs *regs = task_pt_regs(child);
-
- /* Don't allow overwriting the kernel-internal flags word. */
- uregs->flags = regs->flags;
-
- /* Only allow setting the ICS bit in the ex1 word. */
- uregs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(uregs->ex1));
-
- *regs = *uregs;
-}
-
-enum tile_regset {
- REGSET_GPR,
-};
-
-static int tile_gpr_get(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
-{
- struct pt_regs regs;
-
- getregs(target, &regs);
-
- return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &regs, 0,
- sizeof(regs));
-}
-
-static int tile_gpr_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;
- struct pt_regs regs = *task_pt_regs(target);
-
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0,
- sizeof(regs));
- if (ret)
- return ret;
-
- putregs(target, &regs);
-
- return 0;
-}
-
-static const struct user_regset tile_user_regset[] = {
- [REGSET_GPR] = {
- .core_note_type = NT_PRSTATUS,
- .n = ELF_NGREG,
- .size = sizeof(elf_greg_t),
- .align = sizeof(elf_greg_t),
- .get = tile_gpr_get,
- .set = tile_gpr_set,
- },
-};
-
-static const struct user_regset_view tile_user_regset_view = {
- .name = CHIP_ARCH_NAME,
- .e_machine = ELF_ARCH,
- .ei_osabi = ELF_OSABI,
- .regsets = tile_user_regset,
- .n = ARRAY_SIZE(tile_user_regset),
-};
-
-const struct user_regset_view *task_user_regset_view(struct task_struct *task)
-{
- return &tile_user_regset_view;
-}
-
-long arch_ptrace(struct task_struct *child, long request,
- unsigned long addr, unsigned long data)
-{
- unsigned long __user *datap = (long __user __force *)data;
- unsigned long tmp;
- long ret = -EIO;
- char *childreg;
- struct pt_regs copyregs;
-
- switch (request) {
-
- case PTRACE_PEEKUSR: /* Read register from pt_regs. */
- if (addr >= PTREGS_SIZE)
- break;
- childreg = getregs(child, &copyregs) + addr;
-#ifdef CONFIG_COMPAT
- if (is_compat_task()) {
- if (addr & (sizeof(compat_long_t)-1))
- break;
- ret = put_user(*(compat_long_t *)childreg,
- (compat_long_t __user *)datap);
- } else
-#endif
- {
- if (addr & (sizeof(long)-1))
- break;
- ret = put_user(*(long *)childreg, datap);
- }
- break;
-
- case PTRACE_POKEUSR: /* Write register in pt_regs. */
- if (addr >= PTREGS_SIZE)
- break;
- childreg = getregs(child, &copyregs) + addr;
-#ifdef CONFIG_COMPAT
- if (is_compat_task()) {
- if (addr & (sizeof(compat_long_t)-1))
- break;
- *(compat_long_t *)childreg = data;
- } else
-#endif
- {
- if (addr & (sizeof(long)-1))
- break;
- *(long *)childreg = data;
- }
- putregs(child, &copyregs);
- ret = 0;
- break;
-
- case PTRACE_GETREGS: /* Get all registers from the child. */
- ret = copy_regset_to_user(child, &tile_user_regset_view,
- REGSET_GPR, 0,
- sizeof(struct pt_regs), datap);
- break;
-
- case PTRACE_SETREGS: /* Set all registers in the child. */
- ret = copy_regset_from_user(child, &tile_user_regset_view,
- REGSET_GPR, 0,
- sizeof(struct pt_regs), datap);
- break;
-
- case PTRACE_GETFPREGS: /* Get the child FPU state. */
- case PTRACE_SETFPREGS: /* Set the child FPU state. */
- break;
-
- case PTRACE_SETOPTIONS:
- /* Support TILE-specific ptrace options. */
- BUILD_BUG_ON(PTRACE_O_MASK_TILE & PTRACE_O_MASK);
- tmp = data & PTRACE_O_MASK_TILE;
- data &= ~PTRACE_O_MASK_TILE;
- ret = ptrace_request(child, request, addr, data);
- if (ret == 0) {
- unsigned int flags = child->ptrace;
- flags &= ~(PTRACE_O_MASK_TILE << PT_OPT_FLAG_SHIFT);
- flags |= (tmp << PT_OPT_FLAG_SHIFT);
- child->ptrace = flags;
- }
- break;
-
- default:
-#ifdef CONFIG_COMPAT
- if (task_thread_info(current)->status & TS_COMPAT) {
- ret = compat_ptrace_request(child, request,
- addr, data);
- break;
- }
-#endif
- ret = ptrace_request(child, request, addr, data);
- break;
- }
-
- return ret;
-}
-
-#ifdef CONFIG_COMPAT
-/* Not used; we handle compat issues in arch_ptrace() directly. */
-long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
- compat_ulong_t addr, compat_ulong_t data)
-{
- BUG();
-}
-#endif
-
-int do_syscall_trace_enter(struct pt_regs *regs)
-{
- u32 work = READ_ONCE(current_thread_info()->flags);
-
- if ((work & _TIF_SYSCALL_TRACE) &&
- tracehook_report_syscall_entry(regs)) {
- regs->regs[TREG_SYSCALL_NR] = -1;
- return -1;
- }
-
- if (secure_computing(NULL) == -1)
- return -1;
-
- if (work & _TIF_SYSCALL_TRACEPOINT)
- trace_sys_enter(regs, regs->regs[TREG_SYSCALL_NR]);
-
- return regs->regs[TREG_SYSCALL_NR];
-}
-
-void do_syscall_trace_exit(struct pt_regs *regs)
-{
- long errno;
-
- /*
- * The standard tile calling convention returns the value (or negative
- * errno) in r0, and zero (or positive errno) in r1.
- * It saves a couple of cycles on the hot path to do this work in
- * registers only as we return, rather than updating the in-memory
- * struct ptregs.
- */
- errno = (long) regs->regs[0];
- if (errno < 0 && errno > -4096)
- regs->regs[1] = -errno;
- else
- regs->regs[1] = 0;
-
- if (test_thread_flag(TIF_SYSCALL_TRACE))
- tracehook_report_syscall_exit(regs, 0);
-
- if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
- trace_sys_exit(regs, regs->regs[0]);
-}
-
-void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs)
-{
- struct siginfo info;
-
- memset(&info, 0, sizeof(info));
- info.si_signo = SIGTRAP;
- info.si_code = TRAP_BRKPT;
- info.si_addr = (void __user *) regs->pc;
-
- /* Send us the fakey SIGTRAP */
- force_sig_info(SIGTRAP, &info, tsk);
-}
-
-/* Handle synthetic interrupt delivered only by the simulator. */
-void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
-{
- send_sigtrap(current, regs);
-}
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