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317 lines
7.4 KiB
317 lines
7.4 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1992 Ross Biro |
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* Copyright (C) Linus Torvalds |
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* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle |
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* Copyright (C) 1996 David S. Miller |
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* Kevin D. Kissell, [email protected] and Carsten Langgaard, [email protected] |
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* Copyright (C) 1999 MIPS Technologies, Inc. |
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* Copyright (C) 2000 Ulf Carlsson |
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* |
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* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit |
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* binaries. |
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*/ |
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#include <linux/compiler.h> |
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#include <linux/compat.h> |
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/mm.h> |
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#include <linux/errno.h> |
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#include <linux/ptrace.h> |
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#include <linux/smp.h> |
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#include <linux/security.h> |
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#include <asm/cpu.h> |
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#include <asm/dsp.h> |
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#include <asm/fpu.h> |
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#include <asm/mipsregs.h> |
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#include <asm/mipsmtregs.h> |
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#include <asm/page.h> |
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#include <asm/reg.h> |
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#include <asm/syscall.h> |
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#include <linux/uaccess.h> |
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#include <asm/bootinfo.h> |
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/* |
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* Tracing a 32-bit process with a 64-bit strace and vice versa will not |
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* work. I don't know how to fix this. |
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*/ |
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long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
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compat_ulong_t caddr, compat_ulong_t cdata) |
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{ |
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int addr = caddr; |
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int data = cdata; |
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int ret; |
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switch (request) { |
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/* |
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* Read 4 bytes of the other process' storage |
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* data is a pointer specifying where the user wants the |
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* 4 bytes copied into |
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* addr is a pointer in the user's storage that contains an 8 byte |
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* address in the other process of the 4 bytes that is to be read |
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* (this is run in a 32-bit process looking at a 64-bit process) |
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* when I and D space are separate, these will need to be fixed. |
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*/ |
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case PTRACE_PEEKTEXT_3264: |
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case PTRACE_PEEKDATA_3264: { |
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u32 tmp; |
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int copied; |
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u32 __user * addrOthers; |
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ret = -EIO; |
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|
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/* Get the addr in the other process that we want to read */ |
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if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) |
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break; |
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copied = ptrace_access_vm(child, (u64)addrOthers, &tmp, |
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sizeof(tmp), FOLL_FORCE); |
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if (copied != sizeof(tmp)) |
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break; |
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ret = put_user(tmp, (u32 __user *) (unsigned long) data); |
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break; |
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} |
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/* Read the word at location addr in the USER area. */ |
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case PTRACE_PEEKUSR: { |
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struct pt_regs *regs; |
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unsigned int tmp; |
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regs = task_pt_regs(child); |
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ret = 0; /* Default return value. */ |
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switch (addr) { |
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case 0 ... 31: |
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tmp = regs->regs[addr]; |
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break; |
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#ifdef CONFIG_MIPS_FP_SUPPORT |
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case FPR_BASE ... FPR_BASE + 31: { |
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union fpureg *fregs; |
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if (!tsk_used_math(child)) { |
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/* FP not yet used */ |
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tmp = -1; |
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break; |
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} |
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fregs = get_fpu_regs(child); |
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if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { |
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/* |
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* The odd registers are actually the high |
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* order bits of the values stored in the even |
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* registers. |
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*/ |
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tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE], |
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addr & 1); |
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break; |
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} |
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tmp = get_fpr64(&fregs[addr - FPR_BASE], 0); |
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break; |
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} |
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case FPC_CSR: |
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tmp = child->thread.fpu.fcr31; |
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break; |
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case FPC_EIR: |
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/* implementation / version register */ |
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tmp = boot_cpu_data.fpu_id; |
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break; |
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#endif /* CONFIG_MIPS_FP_SUPPORT */ |
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case PC: |
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tmp = regs->cp0_epc; |
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break; |
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case CAUSE: |
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tmp = regs->cp0_cause; |
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break; |
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case BADVADDR: |
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tmp = regs->cp0_badvaddr; |
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break; |
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case MMHI: |
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tmp = regs->hi; |
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break; |
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case MMLO: |
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tmp = regs->lo; |
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break; |
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case DSP_BASE ... DSP_BASE + 5: { |
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dspreg_t *dregs; |
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if (!cpu_has_dsp) { |
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tmp = 0; |
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ret = -EIO; |
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goto out; |
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} |
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dregs = __get_dsp_regs(child); |
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tmp = dregs[addr - DSP_BASE]; |
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break; |
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} |
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case DSP_CONTROL: |
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if (!cpu_has_dsp) { |
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tmp = 0; |
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ret = -EIO; |
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goto out; |
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} |
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tmp = child->thread.dsp.dspcontrol; |
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break; |
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default: |
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tmp = 0; |
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ret = -EIO; |
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goto out; |
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} |
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ret = put_user(tmp, (unsigned __user *) (unsigned long) data); |
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break; |
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} |
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/* |
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* Write 4 bytes into the other process' storage |
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* data is the 4 bytes that the user wants written |
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* addr is a pointer in the user's storage that contains an |
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* 8 byte address in the other process where the 4 bytes |
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* that is to be written |
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* (this is run in a 32-bit process looking at a 64-bit process) |
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* when I and D space are separate, these will need to be fixed. |
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*/ |
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case PTRACE_POKETEXT_3264: |
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case PTRACE_POKEDATA_3264: { |
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u32 __user * addrOthers; |
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/* Get the addr in the other process that we want to write into */ |
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ret = -EIO; |
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if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) |
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break; |
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ret = 0; |
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if (ptrace_access_vm(child, (u64)addrOthers, &data, |
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sizeof(data), |
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FOLL_FORCE | FOLL_WRITE) == sizeof(data)) |
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break; |
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ret = -EIO; |
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break; |
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} |
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case PTRACE_POKEUSR: { |
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struct pt_regs *regs; |
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ret = 0; |
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regs = task_pt_regs(child); |
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switch (addr) { |
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case 0 ... 31: |
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regs->regs[addr] = data; |
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/* System call number may have been changed */ |
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if (addr == 2) |
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mips_syscall_update_nr(child, regs); |
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else if (addr == 4 && |
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mips_syscall_is_indirect(child, regs)) |
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mips_syscall_update_nr(child, regs); |
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break; |
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#ifdef CONFIG_MIPS_FP_SUPPORT |
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case FPR_BASE ... FPR_BASE + 31: { |
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union fpureg *fregs = get_fpu_regs(child); |
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if (!tsk_used_math(child)) { |
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/* FP not yet used */ |
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memset(&child->thread.fpu, ~0, |
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sizeof(child->thread.fpu)); |
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child->thread.fpu.fcr31 = 0; |
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} |
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if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { |
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/* |
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* The odd registers are actually the high |
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* order bits of the values stored in the even |
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* registers. |
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*/ |
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set_fpr32(&fregs[(addr & ~1) - FPR_BASE], |
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addr & 1, data); |
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break; |
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} |
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set_fpr64(&fregs[addr - FPR_BASE], 0, data); |
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break; |
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} |
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case FPC_CSR: |
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child->thread.fpu.fcr31 = data; |
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break; |
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#endif /* CONFIG_MIPS_FP_SUPPORT */ |
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case PC: |
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regs->cp0_epc = data; |
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break; |
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case MMHI: |
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regs->hi = data; |
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break; |
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case MMLO: |
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regs->lo = data; |
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break; |
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case DSP_BASE ... DSP_BASE + 5: { |
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dspreg_t *dregs; |
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if (!cpu_has_dsp) { |
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ret = -EIO; |
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break; |
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} |
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dregs = __get_dsp_regs(child); |
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dregs[addr - DSP_BASE] = data; |
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break; |
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} |
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case DSP_CONTROL: |
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if (!cpu_has_dsp) { |
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ret = -EIO; |
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break; |
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} |
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child->thread.dsp.dspcontrol = data; |
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break; |
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default: |
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/* The rest are not allowed. */ |
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ret = -EIO; |
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break; |
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} |
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break; |
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} |
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case PTRACE_GETREGS: |
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ret = ptrace_getregs(child, |
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(struct user_pt_regs __user *) (__u64) data); |
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break; |
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case PTRACE_SETREGS: |
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ret = ptrace_setregs(child, |
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(struct user_pt_regs __user *) (__u64) data); |
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break; |
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#ifdef CONFIG_MIPS_FP_SUPPORT |
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case PTRACE_GETFPREGS: |
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ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data); |
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break; |
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case PTRACE_SETFPREGS: |
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ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data); |
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break; |
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#endif |
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case PTRACE_GET_THREAD_AREA: |
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ret = put_user(task_thread_info(child)->tp_value, |
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(unsigned int __user *) (unsigned long) data); |
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break; |
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case PTRACE_GET_THREAD_AREA_3264: |
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ret = put_user(task_thread_info(child)->tp_value, |
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(unsigned long __user *) (unsigned long) data); |
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break; |
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case PTRACE_GET_WATCH_REGS: |
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ret = ptrace_get_watch_regs(child, |
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(struct pt_watch_regs __user *) (unsigned long) addr); |
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break; |
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case PTRACE_SET_WATCH_REGS: |
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ret = ptrace_set_watch_regs(child, |
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(struct pt_watch_regs __user *) (unsigned long) addr); |
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break; |
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default: |
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ret = compat_ptrace_request(child, request, addr, data); |
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break; |
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} |
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out: |
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return ret; |
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}
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