| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1992 Ross Biro |
| * Copyright (C) Linus Torvalds |
| * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle |
| * Copyright (C) 1996 David S. Miller |
| * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com |
| * Copyright (C) 1999 MIPS Technologies, Inc. |
| * Copyright (C) 2000 Ulf Carlsson |
| * |
| * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit |
| * binaries. |
| */ |
| #include <linux/compiler.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/errno.h> |
| #include <linux/ptrace.h> |
| #include <linux/smp.h> |
| #include <linux/smp_lock.h> |
| #include <linux/user.h> |
| #include <linux/security.h> |
| |
| #include <asm/cpu.h> |
| #include <asm/dsp.h> |
| #include <asm/fpu.h> |
| #include <asm/mipsregs.h> |
| #include <asm/mipsmtregs.h> |
| #include <asm/pgtable.h> |
| #include <asm/page.h> |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| #include <asm/bootinfo.h> |
| |
| int ptrace_getregs (struct task_struct *child, __s64 __user *data); |
| int ptrace_setregs (struct task_struct *child, __s64 __user *data); |
| |
| int ptrace_getfpregs (struct task_struct *child, __u32 __user *data); |
| int ptrace_setfpregs (struct task_struct *child, __u32 __user *data); |
| |
| /* |
| * Tracing a 32-bit process with a 64-bit strace and vice versa will not |
| * work. I don't know how to fix this. |
| */ |
| asmlinkage int sys32_ptrace(int request, int pid, int addr, int data) |
| { |
| struct task_struct *child; |
| int ret; |
| |
| #if 0 |
| printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n", |
| (int) request, (int) pid, (unsigned long) addr, |
| (unsigned long) data); |
| #endif |
| lock_kernel(); |
| if (request == PTRACE_TRACEME) { |
| ret = ptrace_traceme(); |
| goto out; |
| } |
| |
| child = ptrace_get_task_struct(pid); |
| if (IS_ERR(child)) { |
| ret = PTR_ERR(child); |
| goto out; |
| } |
| |
| if (request == PTRACE_ATTACH) { |
| ret = ptrace_attach(child); |
| goto out_tsk; |
| } |
| |
| ret = ptrace_check_attach(child, request == PTRACE_KILL); |
| if (ret < 0) |
| goto out_tsk; |
| |
| switch (request) { |
| /* when I and D space are separate, these will need to be fixed. */ |
| case PTRACE_PEEKTEXT: /* read word at location addr. */ |
| case PTRACE_PEEKDATA: { |
| unsigned int tmp; |
| int copied; |
| |
| copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); |
| ret = -EIO; |
| if (copied != sizeof(tmp)) |
| break; |
| ret = put_user(tmp, (unsigned int __user *) (unsigned long) data); |
| break; |
| } |
| |
| /* |
| * Read 4 bytes of the other process' storage |
| * data is a pointer specifying where the user wants the |
| * 4 bytes copied into |
| * addr is a pointer in the user's storage that contains an 8 byte |
| * address in the other process of the 4 bytes that is to be read |
| * (this is run in a 32-bit process looking at a 64-bit process) |
| * when I and D space are separate, these will need to be fixed. |
| */ |
| case PTRACE_PEEKTEXT_3264: |
| case PTRACE_PEEKDATA_3264: { |
| u32 tmp; |
| int copied; |
| u32 __user * addrOthers; |
| |
| ret = -EIO; |
| |
| /* Get the addr in the other process that we want to read */ |
| if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) |
| break; |
| |
| copied = access_process_vm(child, (u64)addrOthers, &tmp, |
| sizeof(tmp), 0); |
| if (copied != sizeof(tmp)) |
| break; |
| ret = put_user(tmp, (u32 __user *) (unsigned long) data); |
| break; |
| } |
| |
| /* Read the word at location addr in the USER area. */ |
| case PTRACE_PEEKUSR: { |
| struct pt_regs *regs; |
| unsigned int tmp; |
| |
| regs = task_pt_regs(child); |
| ret = 0; /* Default return value. */ |
| |
| switch (addr) { |
| case 0 ... 31: |
| tmp = regs->regs[addr]; |
| break; |
| case FPR_BASE ... FPR_BASE + 31: |
| if (tsk_used_math(child)) { |
| fpureg_t *fregs = get_fpu_regs(child); |
| |
| /* |
| * The odd registers are actually the high |
| * order bits of the values stored in the even |
| * registers - unless we're using r2k_switch.S. |
| */ |
| if (addr & 1) |
| tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32); |
| else |
| tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff); |
| } else { |
| tmp = -1; /* FP not yet used */ |
| } |
| break; |
| case PC: |
| tmp = regs->cp0_epc; |
| break; |
| case CAUSE: |
| tmp = regs->cp0_cause; |
| break; |
| case BADVADDR: |
| tmp = regs->cp0_badvaddr; |
| break; |
| case MMHI: |
| tmp = regs->hi; |
| break; |
| case MMLO: |
| tmp = regs->lo; |
| break; |
| case FPC_CSR: |
| if (cpu_has_fpu) |
| tmp = child->thread.fpu.hard.fcr31; |
| else |
| tmp = child->thread.fpu.soft.fcr31; |
| break; |
| case FPC_EIR: { /* implementation / version register */ |
| unsigned int flags; |
| #ifdef CONFIG_MIPS_MT_SMTC |
| unsigned int irqflags; |
| unsigned int mtflags; |
| #endif /* CONFIG_MIPS_MT_SMTC */ |
| |
| if (!cpu_has_fpu) { |
| tmp = 0; |
| break; |
| } |
| |
| #ifdef CONFIG_MIPS_MT_SMTC |
| /* Read-modify-write of Status must be atomic */ |
| local_irq_save(irqflags); |
| mtflags = dmt(); |
| #endif /* CONFIG_MIPS_MT_SMTC */ |
| |
| preempt_disable(); |
| if (cpu_has_mipsmt) { |
| unsigned int vpflags = dvpe(); |
| flags = read_c0_status(); |
| __enable_fpu(); |
| __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); |
| write_c0_status(flags); |
| evpe(vpflags); |
| } else { |
| flags = read_c0_status(); |
| __enable_fpu(); |
| __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); |
| write_c0_status(flags); |
| } |
| #ifdef CONFIG_MIPS_MT_SMTC |
| emt(mtflags); |
| local_irq_restore(irqflags); |
| #endif /* CONFIG_MIPS_MT_SMTC */ |
| preempt_enable(); |
| break; |
| } |
| case DSP_BASE ... DSP_BASE + 5: { |
| dspreg_t *dregs; |
| |
| if (!cpu_has_dsp) { |
| tmp = 0; |
| ret = -EIO; |
| goto out_tsk; |
| } |
| dregs = __get_dsp_regs(child); |
| tmp = (unsigned long) (dregs[addr - DSP_BASE]); |
| break; |
| } |
| case DSP_CONTROL: |
| if (!cpu_has_dsp) { |
| tmp = 0; |
| ret = -EIO; |
| goto out_tsk; |
| } |
| tmp = child->thread.dsp.dspcontrol; |
| break; |
| default: |
| tmp = 0; |
| ret = -EIO; |
| goto out_tsk; |
| } |
| ret = put_user(tmp, (unsigned __user *) (unsigned long) data); |
| break; |
| } |
| |
| /* when I and D space are separate, this will have to be fixed. */ |
| case PTRACE_POKETEXT: /* write the word at location addr. */ |
| case PTRACE_POKEDATA: |
| ret = 0; |
| if (access_process_vm(child, addr, &data, sizeof(data), 1) |
| == sizeof(data)) |
| break; |
| ret = -EIO; |
| break; |
| |
| /* |
| * Write 4 bytes into the other process' storage |
| * data is the 4 bytes that the user wants written |
| * addr is a pointer in the user's storage that contains an |
| * 8 byte address in the other process where the 4 bytes |
| * that is to be written |
| * (this is run in a 32-bit process looking at a 64-bit process) |
| * when I and D space are separate, these will need to be fixed. |
| */ |
| case PTRACE_POKETEXT_3264: |
| case PTRACE_POKEDATA_3264: { |
| u32 __user * addrOthers; |
| |
| /* Get the addr in the other process that we want to write into */ |
| ret = -EIO; |
| if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) |
| break; |
| ret = 0; |
| if (access_process_vm(child, (u64)addrOthers, &data, |
| sizeof(data), 1) == sizeof(data)) |
| break; |
| ret = -EIO; |
| break; |
| } |
| |
| case PTRACE_POKEUSR: { |
| struct pt_regs *regs; |
| ret = 0; |
| regs = task_pt_regs(child); |
| |
| switch (addr) { |
| case 0 ... 31: |
| regs->regs[addr] = data; |
| break; |
| case FPR_BASE ... FPR_BASE + 31: { |
| fpureg_t *fregs = get_fpu_regs(child); |
| |
| if (!tsk_used_math(child)) { |
| /* FP not yet used */ |
| memset(&child->thread.fpu.hard, ~0, |
| sizeof(child->thread.fpu.hard)); |
| child->thread.fpu.hard.fcr31 = 0; |
| } |
| /* |
| * The odd registers are actually the high order bits |
| * of the values stored in the even registers - unless |
| * we're using r2k_switch.S. |
| */ |
| if (addr & 1) { |
| fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; |
| fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; |
| } else { |
| fregs[addr - FPR_BASE] &= ~0xffffffffLL; |
| /* Must cast, lest sign extension fill upper |
| bits! */ |
| fregs[addr - FPR_BASE] |= (unsigned int)data; |
| } |
| break; |
| } |
| case PC: |
| regs->cp0_epc = data; |
| break; |
| case MMHI: |
| regs->hi = data; |
| break; |
| case MMLO: |
| regs->lo = data; |
| break; |
| case FPC_CSR: |
| if (cpu_has_fpu) |
| child->thread.fpu.hard.fcr31 = data; |
| else |
| child->thread.fpu.soft.fcr31 = data; |
| break; |
| case DSP_BASE ... DSP_BASE + 5: { |
| dspreg_t *dregs; |
| |
| if (!cpu_has_dsp) { |
| ret = -EIO; |
| break; |
| } |
| |
| dregs = __get_dsp_regs(child); |
| dregs[addr - DSP_BASE] = data; |
| break; |
| } |
| case DSP_CONTROL: |
| if (!cpu_has_dsp) { |
| ret = -EIO; |
| break; |
| } |
| child->thread.dsp.dspcontrol = data; |
| break; |
| default: |
| /* The rest are not allowed. */ |
| ret = -EIO; |
| break; |
| } |
| break; |
| } |
| |
| case PTRACE_GETREGS: |
| ret = ptrace_getregs (child, (__u64 __user *) (__u64) data); |
| break; |
| |
| case PTRACE_SETREGS: |
| ret = ptrace_setregs (child, (__u64 __user *) (__u64) data); |
| break; |
| |
| case PTRACE_GETFPREGS: |
| ret = ptrace_getfpregs (child, (__u32 __user *) (__u64) data); |
| break; |
| |
| case PTRACE_SETFPREGS: |
| ret = ptrace_setfpregs (child, (__u32 __user *) (__u64) data); |
| break; |
| |
| case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ |
| case PTRACE_CONT: { /* restart after signal. */ |
| ret = -EIO; |
| if (!valid_signal(data)) |
| break; |
| if (request == PTRACE_SYSCALL) { |
| set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| } |
| else { |
| clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| } |
| child->exit_code = data; |
| wake_up_process(child); |
| ret = 0; |
| break; |
| } |
| |
| /* |
| * make the child exit. Best I can do is send it a sigkill. |
| * perhaps it should be put in the status that it wants to |
| * exit. |
| */ |
| case PTRACE_KILL: |
| ret = 0; |
| if (child->exit_state == EXIT_ZOMBIE) /* already dead */ |
| break; |
| child->exit_code = SIGKILL; |
| wake_up_process(child); |
| break; |
| |
| case PTRACE_GET_THREAD_AREA: |
| ret = put_user(task_thread_info(child)->tp_value, |
| (unsigned int __user *) (unsigned long) data); |
| break; |
| |
| case PTRACE_DETACH: /* detach a process that was attached. */ |
| ret = ptrace_detach(child, data); |
| break; |
| |
| case PTRACE_GETEVENTMSG: |
| ret = put_user(child->ptrace_message, |
| (unsigned int __user *) (unsigned long) data); |
| break; |
| |
| case PTRACE_GET_THREAD_AREA_3264: |
| ret = put_user(task_thread_info(child)->tp_value, |
| (unsigned long __user *) (unsigned long) data); |
| break; |
| |
| default: |
| ret = ptrace_request(child, request, addr, data); |
| break; |
| } |
| |
| out_tsk: |
| put_task_struct(child); |
| out: |
| unlock_kernel(); |
| return ret; |
| } |