Revise MIPS 64-bit ptrace interface
Change the N32 debugging ABI to something more sane, and add support for o32 and n32 debuggers to trace n64 programs. Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -38,6 +38,7 @@
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/bootinfo.h>
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#include <asm/reg.h>
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/*
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* Called by kernel/ptrace.c when detaching..
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@ -49,6 +50,118 @@ void ptrace_disable(struct task_struct *child)
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/* Nothing to do.. */
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}
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/*
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* Read a general register set. We always use the 64-bit format, even
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* for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
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* Registers are sign extended to fill the available space.
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*/
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int ptrace_getregs (struct task_struct *child, __s64 __user *data)
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{
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struct pt_regs *regs;
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int i;
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if (!access_ok(VERIFY_WRITE, data, 38 * 8))
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return -EIO;
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regs = (struct pt_regs *) ((unsigned long) child->thread_info +
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THREAD_SIZE - 32 - sizeof(struct pt_regs));
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for (i = 0; i < 32; i++)
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__put_user (regs->regs[i], data + i);
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__put_user (regs->lo, data + EF_LO - EF_R0);
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__put_user (regs->hi, data + EF_HI - EF_R0);
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__put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
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__put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
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__put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
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__put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
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return 0;
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}
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/*
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* Write a general register set. As for PTRACE_GETREGS, we always use
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* the 64-bit format. On a 32-bit kernel only the lower order half
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* (according to endianness) will be used.
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*/
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int ptrace_setregs (struct task_struct *child, __s64 __user *data)
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{
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struct pt_regs *regs;
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int i;
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if (!access_ok(VERIFY_READ, data, 38 * 8))
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return -EIO;
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regs = (struct pt_regs *) ((unsigned long) child->thread_info +
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THREAD_SIZE - 32 - sizeof(struct pt_regs));
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for (i = 0; i < 32; i++)
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__get_user (regs->regs[i], data + i);
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__get_user (regs->lo, data + EF_LO - EF_R0);
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__get_user (regs->hi, data + EF_HI - EF_R0);
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__get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
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/* badvaddr, status, and cause may not be written. */
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return 0;
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}
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int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
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{
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int i;
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if (!access_ok(VERIFY_WRITE, data, 33 * 8))
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return -EIO;
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if (tsk_used_math(child)) {
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fpureg_t *fregs = get_fpu_regs(child);
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for (i = 0; i < 32; i++)
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__put_user (fregs[i], i + (__u64 __user *) data);
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} else {
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for (i = 0; i < 32; i++)
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__put_user ((__u64) -1, i + (__u64 __user *) data);
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}
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if (cpu_has_fpu) {
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unsigned int flags, tmp;
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__put_user (child->thread.fpu.hard.fcr31, data + 64);
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flags = read_c0_status();
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__enable_fpu();
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__asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
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write_c0_status(flags);
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__put_user (tmp, data + 65);
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} else {
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__put_user (child->thread.fpu.soft.fcr31, data + 64);
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__put_user ((__u32) 0, data + 65);
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}
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return 0;
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}
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int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
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{
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fpureg_t *fregs;
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int i;
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if (!access_ok(VERIFY_READ, data, 33 * 8))
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return -EIO;
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fregs = get_fpu_regs(child);
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for (i = 0; i < 32; i++)
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__get_user (fregs[i], i + (__u64 __user *) data);
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if (cpu_has_fpu)
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__get_user (child->thread.fpu.hard.fcr31, data + 64);
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else
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__get_user (child->thread.fpu.soft.fcr31, data + 64);
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/* FIR may not be written. */
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return 0;
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}
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asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
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{
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struct task_struct *child;
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@ -300,6 +413,22 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
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break;
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}
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case PTRACE_GETREGS:
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ret = ptrace_getregs (child, (__u64 __user *) data);
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break;
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case PTRACE_SETREGS:
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ret = ptrace_setregs (child, (__u64 __user *) data);
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break;
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case PTRACE_GETFPREGS:
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ret = ptrace_getfpregs (child, (__u32 __user *) data);
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break;
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case PTRACE_SETFPREGS:
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ret = ptrace_setfpregs (child, (__u32 __user *) data);
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break;
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case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
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case PTRACE_CONT: { /* restart after signal. */
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ret = -EIO;
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@ -35,6 +35,12 @@
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#include <asm/uaccess.h>
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#include <asm/bootinfo.h>
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int ptrace_getregs (struct task_struct *child, __s64 __user *data);
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int ptrace_setregs (struct task_struct *child, __s64 __user *data);
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int ptrace_getfpregs (struct task_struct *child, __u32 __user *data);
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int ptrace_setfpregs (struct task_struct *child, __u32 __user *data);
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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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@ -99,6 +105,35 @@ asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
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break;
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}
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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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/* 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 = access_process_vm(child, (u64)addrOthers, &tmp,
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sizeof(tmp), 0);
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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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ret = -EIO;
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break;
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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 (access_process_vm(child, (u64)addrOthers, &data,
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sizeof(data), 1) == 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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break;
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}
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case PTRACE_GETREGS:
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ret = ptrace_getregs (child, (__u64 __user *) (__u64) data);
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break;
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case PTRACE_SETREGS:
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ret = ptrace_setregs (child, (__u64 __user *) (__u64) data);
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break;
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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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case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
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case PTRACE_CONT: { /* restart after signal. */
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ret = -EIO;
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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(child->thread_info->tp_value,
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(unsigned long __user *) (unsigned long) data);
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break;
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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@ -216,7 +216,7 @@ EXPORT(sysn32_call_table)
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PTR compat_sys_getrusage
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PTR sys32_sysinfo
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PTR compat_sys_times
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PTR sys_ptrace
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PTR sys32_ptrace
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PTR sys_getuid /* 6100 */
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PTR sys_syslog
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PTR sys_getgid
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@ -48,10 +48,10 @@ struct pt_regs {
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};
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/* Arbitrarily choose the same ptrace numbers as used by the Sparc code. */
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/* #define PTRACE_GETREGS 12 */
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/* #define PTRACE_SETREGS 13 */
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/* #define PTRACE_GETFPREGS 14 */
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/* #define PTRACE_SETFPREGS 15 */
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#define PTRACE_GETREGS 12
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#define PTRACE_SETREGS 13
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#define PTRACE_GETFPREGS 14
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#define PTRACE_SETFPREGS 15
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/* #define PTRACE_GETFPXREGS 18 */
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/* #define PTRACE_SETFPXREGS 19 */
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#define PTRACE_GET_THREAD_AREA 25
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#define PTRACE_SET_THREAD_AREA 26
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/* Calls to trace a 64bit program from a 32bit program. */
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#define PTRACE_PEEKTEXT_3264 0xc0
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#define PTRACE_PEEKDATA_3264 0xc1
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#define PTRACE_POKETEXT_3264 0xc2
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#define PTRACE_POKEDATA_3264 0xc3
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#define PTRACE_GET_THREAD_AREA_3264 0xc4
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#ifdef __KERNEL__
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#include <linux/linkage.h>
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