diff options
Diffstat (limited to 'arch/tile/kernel/ptrace.c')
| -rw-r--r-- | arch/tile/kernel/ptrace.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c new file mode 100644 index 00000000000..7161bd03d2f --- /dev/null +++ b/arch/tile/kernel/ptrace.c @@ -0,0 +1,205 @@ +/* + * 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 <asm/traps.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); +} + +/* + * This routine will put a word on the process's privileged stack. + */ +static void putreg(struct task_struct *task, + unsigned long addr, unsigned long value) +{ + unsigned int regno = addr / sizeof(unsigned long); + struct pt_regs *childregs = task_pt_regs(task); + childregs->regs[regno] = value; + childregs->flags |= PT_FLAGS_RESTORE_REGS; +} + +static unsigned long getreg(struct task_struct *task, unsigned long addr) +{ + unsigned int regno = addr / sizeof(unsigned long); + struct pt_regs *childregs = task_pt_regs(task); + return childregs->regs[regno]; +} + +/* + * 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); +} + +long arch_ptrace(struct task_struct *child, long request, long addr, long data) +{ + unsigned long __user *datap; + unsigned long tmp; + int i; + long ret = -EIO; + +#ifdef CONFIG_COMPAT + if (task_thread_info(current)->status & TS_COMPAT) + data = (u32)data; + if (task_thread_info(child)->status & TS_COMPAT) + addr = (u32)addr; +#endif + datap = (unsigned long __user __force *)data; + + switch (request) { + + case PTRACE_PEEKUSR: /* Read register from pt_regs. */ + if (addr & (sizeof(data)-1)) + break; + if (addr < 0 || addr >= PTREGS_SIZE) + break; + tmp = getreg(child, addr); /* Read register */ + ret = put_user(tmp, datap); + break; + + case PTRACE_POKEUSR: /* Write register in pt_regs. */ + if (addr & (sizeof(data)-1)) + break; + if (addr < 0 || addr >= PTREGS_SIZE) + break; + putreg(child, addr, data); /* Write register */ + ret = 0; + break; + + case PTRACE_GETREGS: /* Get all registers from the child. */ + if (!access_ok(VERIFY_WRITE, datap, PTREGS_SIZE)) + break; + for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) { + ret = __put_user(getreg(child, i), datap); + if (ret != 0) + break; + datap++; + } + break; + + case PTRACE_SETREGS: /* Set all registers in the child. */ + if (!access_ok(VERIFY_READ, datap, PTREGS_SIZE)) + break; + for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) { + ret = __get_user(tmp, datap); + if (ret != 0) + break; + putreg(child, i, tmp); + 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. */ + child->ptrace &= ~PT_TRACE_MASK_TILE; + tmp = data & PTRACE_O_MASK_TILE; + data &= ~PTRACE_O_MASK_TILE; + ret = ptrace_request(child, request, addr, data); + if (tmp & PTRACE_O_TRACEMIGRATE) + child->ptrace |= PT_TRACE_MIGRATE; + 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 + +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. strace only continues with a signal if the + * stopping signal is not SIGTRAP. -brl + */ + if (current->exit_code) { + send_sig(current->exit_code, current, 1); + current->exit_code = 0; + } +} + +void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code) +{ + 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, fault_num); +} |