1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
633 lines
15 KiB
C
633 lines
15 KiB
C
/* ptrace.c: Sparc process tracing support.
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*
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* Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
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*
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* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
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* and David Mosberger.
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*
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* Added Linux support -miguel (weird, eh?, the orignal code was meant
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* to emulate SunOS).
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*/
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#include <linux/kernel.h>
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#include <linux/sched.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/user.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/security.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#define MAGIC_CONSTANT 0x80000000
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/* Returning from ptrace is a bit tricky because the syscall return
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* low level code assumes any value returned which is negative and
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* is a valid errno will mean setting the condition codes to indicate
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* an error return. This doesn't work, so we have this hook.
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*/
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static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
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{
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regs->u_regs[UREG_I0] = error;
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regs->psr |= PSR_C;
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regs->pc = regs->npc;
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regs->npc += 4;
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}
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static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
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{
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regs->u_regs[UREG_I0] = value;
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regs->psr &= ~PSR_C;
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regs->pc = regs->npc;
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regs->npc += 4;
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}
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static void
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pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr)
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{
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if (put_user(value, addr)) {
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pt_error_return(regs, EFAULT);
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return;
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}
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regs->u_regs[UREG_I0] = 0;
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regs->psr &= ~PSR_C;
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regs->pc = regs->npc;
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regs->npc += 4;
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}
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static void
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pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr)
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{
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if (current->personality == PER_SUNOS)
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pt_succ_return (regs, val);
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else
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pt_succ_return_linux (regs, val, addr);
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}
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/* Fuck me gently with a chainsaw... */
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static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
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struct task_struct *tsk, long __user *addr)
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{
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struct pt_regs *cregs = tsk->thread.kregs;
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struct thread_info *t = tsk->thread_info;
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int v;
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if(offset >= 1024)
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offset -= 1024; /* whee... */
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if(offset & ((sizeof(unsigned long) - 1))) {
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pt_error_return(regs, EIO);
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return;
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}
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if(offset >= 16 && offset < 784) {
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offset -= 16; offset >>= 2;
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pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
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return;
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}
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if(offset >= 784 && offset < 832) {
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offset -= 784; offset >>= 2;
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pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
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return;
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}
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switch(offset) {
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case 0:
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v = t->ksp;
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break;
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case 4:
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v = t->kpc;
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break;
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case 8:
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v = t->kpsr;
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break;
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case 12:
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v = t->uwinmask;
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break;
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case 832:
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v = t->w_saved;
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break;
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case 896:
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v = cregs->u_regs[UREG_I0];
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break;
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case 900:
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v = cregs->u_regs[UREG_I1];
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break;
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case 904:
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v = cregs->u_regs[UREG_I2];
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break;
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case 908:
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v = cregs->u_regs[UREG_I3];
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break;
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case 912:
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v = cregs->u_regs[UREG_I4];
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break;
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case 916:
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v = cregs->u_regs[UREG_I5];
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break;
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case 920:
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v = cregs->u_regs[UREG_I6];
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break;
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case 924:
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if(tsk->thread.flags & MAGIC_CONSTANT)
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v = cregs->u_regs[UREG_G1];
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else
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v = 0;
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break;
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case 940:
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v = cregs->u_regs[UREG_I0];
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break;
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case 944:
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v = cregs->u_regs[UREG_I1];
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break;
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case 948:
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/* Isn't binary compatibility _fun_??? */
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if(cregs->psr & PSR_C)
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v = cregs->u_regs[UREG_I0] << 24;
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else
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v = 0;
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break;
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/* Rest of them are completely unsupported. */
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default:
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printk("%s [%d]: Wants to read user offset %ld\n",
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current->comm, current->pid, offset);
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pt_error_return(regs, EIO);
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return;
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}
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if (current->personality == PER_SUNOS)
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pt_succ_return (regs, v);
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else
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pt_succ_return_linux (regs, v, addr);
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return;
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}
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static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
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struct task_struct *tsk)
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{
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struct pt_regs *cregs = tsk->thread.kregs;
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struct thread_info *t = tsk->thread_info;
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unsigned long value = regs->u_regs[UREG_I3];
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if(offset >= 1024)
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offset -= 1024; /* whee... */
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if(offset & ((sizeof(unsigned long) - 1)))
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goto failure;
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if(offset >= 16 && offset < 784) {
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offset -= 16; offset >>= 2;
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*(((unsigned long *)(&t->reg_window[0]))+offset) = value;
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goto success;
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}
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if(offset >= 784 && offset < 832) {
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offset -= 784; offset >>= 2;
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*(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
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goto success;
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}
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switch(offset) {
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case 896:
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cregs->u_regs[UREG_I0] = value;
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break;
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case 900:
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cregs->u_regs[UREG_I1] = value;
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break;
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case 904:
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cregs->u_regs[UREG_I2] = value;
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break;
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case 908:
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cregs->u_regs[UREG_I3] = value;
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break;
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case 912:
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cregs->u_regs[UREG_I4] = value;
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break;
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case 916:
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cregs->u_regs[UREG_I5] = value;
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break;
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case 920:
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cregs->u_regs[UREG_I6] = value;
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break;
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case 924:
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cregs->u_regs[UREG_I7] = value;
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break;
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case 940:
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cregs->u_regs[UREG_I0] = value;
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break;
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case 944:
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cregs->u_regs[UREG_I1] = value;
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break;
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/* Rest of them are completely unsupported or "no-touch". */
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default:
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printk("%s [%d]: Wants to write user offset %ld\n",
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current->comm, current->pid, offset);
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goto failure;
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}
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success:
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pt_succ_return(regs, 0);
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return;
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failure:
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pt_error_return(regs, EIO);
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return;
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}
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/* #define ALLOW_INIT_TRACING */
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/* #define DEBUG_PTRACE */
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#ifdef DEBUG_PTRACE
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char *pt_rq [] = {
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/* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
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/* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
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/* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
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/* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
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/* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
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/* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
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/* 24 */ "SYSCALL", ""
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};
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#endif
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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* Make sure single step bits etc are not set.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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/* nothing to do */
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}
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asmlinkage void do_ptrace(struct pt_regs *regs)
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{
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unsigned long request = regs->u_regs[UREG_I0];
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unsigned long pid = regs->u_regs[UREG_I1];
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unsigned long addr = regs->u_regs[UREG_I2];
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unsigned long data = regs->u_regs[UREG_I3];
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unsigned long addr2 = regs->u_regs[UREG_I4];
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struct task_struct *child;
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int ret;
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lock_kernel();
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#ifdef DEBUG_PTRACE
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{
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char *s;
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if ((request >= 0) && (request <= 24))
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s = pt_rq [request];
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else
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s = "unknown";
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if (request == PTRACE_POKEDATA && data == 0x91d02001){
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printk ("do_ptrace: breakpoint pid=%d, addr=%08lx addr2=%08lx\n",
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pid, addr, addr2);
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} else
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printk("do_ptrace: rq=%s(%d) pid=%d addr=%08lx data=%08lx addr2=%08lx\n",
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s, (int) request, (int) pid, addr, data, addr2);
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}
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#endif
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if (request == PTRACE_TRACEME) {
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int my_ret;
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/* are we already being traced? */
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if (current->ptrace & PT_PTRACED) {
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pt_error_return(regs, EPERM);
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goto out;
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}
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my_ret = security_ptrace(current->parent, current);
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if (my_ret) {
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pt_error_return(regs, -my_ret);
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goto out;
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}
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/* set the ptrace bit in the process flags. */
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current->ptrace |= PT_PTRACED;
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pt_succ_return(regs, 0);
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goto out;
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}
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#ifndef ALLOW_INIT_TRACING
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if (pid == 1) {
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/* Can't dork with init. */
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pt_error_return(regs, EPERM);
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goto out;
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}
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#endif
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (!child) {
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pt_error_return(regs, ESRCH);
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goto out;
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}
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if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
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|| (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
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if (ptrace_attach(child)) {
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pt_error_return(regs, EPERM);
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goto out_tsk;
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0) {
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pt_error_return(regs, -ret);
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goto out_tsk;
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}
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switch(request) {
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA: {
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unsigned long tmp;
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if (access_process_vm(child, addr,
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&tmp, sizeof(tmp), 0) == sizeof(tmp))
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pt_os_succ_return(regs, tmp, (long __user *)data);
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else
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pt_error_return(regs, EIO);
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goto out_tsk;
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}
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case PTRACE_PEEKUSR:
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read_sunos_user(regs, addr, child, (long __user *) data);
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goto out_tsk;
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case PTRACE_POKEUSR:
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write_sunos_user(regs, addr, child);
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goto out_tsk;
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA: {
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if (access_process_vm(child, addr,
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&data, sizeof(data), 1) == sizeof(data))
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pt_succ_return(regs, 0);
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else
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pt_error_return(regs, EIO);
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goto out_tsk;
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}
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case PTRACE_GETREGS: {
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struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
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struct pt_regs *cregs = child->thread.kregs;
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int rval;
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if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
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rval = -EFAULT;
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pt_error_return(regs, -rval);
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goto out_tsk;
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}
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__put_user(cregs->psr, (&pregs->psr));
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__put_user(cregs->pc, (&pregs->pc));
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__put_user(cregs->npc, (&pregs->npc));
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__put_user(cregs->y, (&pregs->y));
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for(rval = 1; rval < 16; rval++)
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__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
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pt_succ_return(regs, 0);
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#ifdef DEBUG_PTRACE
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printk ("PC=%x nPC=%x o7=%x\n", cregs->pc, cregs->npc, cregs->u_regs [15]);
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#endif
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goto out_tsk;
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}
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case PTRACE_SETREGS: {
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struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
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struct pt_regs *cregs = child->thread.kregs;
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unsigned long psr, pc, npc, y;
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int i;
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/* Must be careful, tracing process can only set certain
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* bits in the psr.
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*/
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if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
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pt_error_return(regs, EFAULT);
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goto out_tsk;
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}
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__get_user(psr, (&pregs->psr));
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__get_user(pc, (&pregs->pc));
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__get_user(npc, (&pregs->npc));
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__get_user(y, (&pregs->y));
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psr &= PSR_ICC;
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cregs->psr &= ~PSR_ICC;
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cregs->psr |= psr;
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if (!((pc | npc) & 3)) {
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cregs->pc = pc;
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cregs->npc =npc;
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}
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cregs->y = y;
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for(i = 1; i < 16; i++)
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__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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case PTRACE_GETFPREGS: {
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struct fps {
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unsigned long regs[32];
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unsigned long fsr;
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unsigned long flags;
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unsigned long extra;
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unsigned long fpqd;
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struct fq {
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unsigned long *insnaddr;
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unsigned long insn;
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} fpq[16];
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};
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struct fps __user *fps = (struct fps __user *) addr;
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int i;
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if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
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i = -EFAULT;
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pt_error_return(regs, -i);
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goto out_tsk;
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}
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for(i = 0; i < 32; i++)
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__put_user(child->thread.float_regs[i], (&fps->regs[i]));
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__put_user(child->thread.fsr, (&fps->fsr));
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__put_user(child->thread.fpqdepth, (&fps->fpqd));
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__put_user(0, (&fps->flags));
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__put_user(0, (&fps->extra));
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for(i = 0; i < 16; i++) {
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__put_user(child->thread.fpqueue[i].insn_addr,
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(&fps->fpq[i].insnaddr));
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__put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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case PTRACE_SETFPREGS: {
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struct fps {
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unsigned long regs[32];
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unsigned long fsr;
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unsigned long flags;
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unsigned long extra;
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unsigned long fpqd;
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struct fq {
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unsigned long *insnaddr;
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unsigned long insn;
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} fpq[16];
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};
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struct fps __user *fps = (struct fps __user *) addr;
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int i;
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if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
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i = -EFAULT;
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pt_error_return(regs, -i);
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goto out_tsk;
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}
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copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
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__get_user(child->thread.fsr, (&fps->fsr));
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__get_user(child->thread.fpqdepth, (&fps->fpqd));
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for(i = 0; i < 16; i++) {
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__get_user(child->thread.fpqueue[i].insn_addr,
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(&fps->fpq[i].insnaddr));
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__get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
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}
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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case PTRACE_READTEXT:
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case PTRACE_READDATA: {
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int res = ptrace_readdata(child, addr,
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(void __user *) addr2, data);
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if (res == data) {
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pt_succ_return(regs, 0);
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goto out_tsk;
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}
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/* Partial read is an IO failure */
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if (res >= 0)
|
|
res = -EIO;
|
|
pt_error_return(regs, -res);
|
|
goto out_tsk;
|
|
}
|
|
|
|
case PTRACE_WRITETEXT:
|
|
case PTRACE_WRITEDATA: {
|
|
int res = ptrace_writedata(child, (void __user *) addr2,
|
|
addr, data);
|
|
|
|
if (res == data) {
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
/* Partial write is an IO failure */
|
|
if (res >= 0)
|
|
res = -EIO;
|
|
pt_error_return(regs, -res);
|
|
goto out_tsk;
|
|
}
|
|
|
|
case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
|
|
addr = 1;
|
|
|
|
case PTRACE_CONT: { /* restart after signal. */
|
|
if (data > _NSIG) {
|
|
pt_error_return(regs, EIO);
|
|
goto out_tsk;
|
|
}
|
|
if (addr != 1) {
|
|
if (addr & 3) {
|
|
pt_error_return(regs, EINVAL);
|
|
goto out_tsk;
|
|
}
|
|
#ifdef DEBUG_PTRACE
|
|
printk ("Original: %08lx %08lx\n", child->thread.kregs->pc, child->thread.kregs->npc);
|
|
printk ("Continuing with %08lx %08lx\n", addr, addr+4);
|
|
#endif
|
|
child->thread.kregs->pc = addr;
|
|
child->thread.kregs->npc = addr + 4;
|
|
}
|
|
|
|
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;
|
|
#ifdef DEBUG_PTRACE
|
|
printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n",
|
|
child->comm, child->pid, child->exit_code,
|
|
child->thread.kregs->pc,
|
|
child->thread.kregs->npc);
|
|
#endif
|
|
wake_up_process(child);
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
/*
|
|
* 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: {
|
|
if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
wake_up_process(child);
|
|
child->exit_code = SIGKILL;
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
case PTRACE_SUNDETACH: { /* detach a process that was attached. */
|
|
int err = ptrace_detach(child, data);
|
|
if (err) {
|
|
pt_error_return(regs, EIO);
|
|
goto out_tsk;
|
|
}
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
|
|
/* PTRACE_DUMPCORE unsupported... */
|
|
|
|
default: {
|
|
int err = ptrace_request(child, request, addr, data);
|
|
if (err)
|
|
pt_error_return(regs, -err);
|
|
else
|
|
pt_succ_return(regs, 0);
|
|
goto out_tsk;
|
|
}
|
|
}
|
|
out_tsk:
|
|
if (child)
|
|
put_task_struct(child);
|
|
out:
|
|
unlock_kernel();
|
|
}
|
|
|
|
asmlinkage void syscall_trace(void)
|
|
{
|
|
#ifdef DEBUG_PTRACE
|
|
printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
|
|
#endif
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
|
return;
|
|
if (!(current->ptrace & PT_PTRACED))
|
|
return;
|
|
current->thread.flags ^= MAGIC_CONSTANT;
|
|
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
|
|
*/
|
|
#ifdef DEBUG_PTRACE
|
|
printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
|
|
current->pid, current->exit_code);
|
|
#endif
|
|
if (current->exit_code) {
|
|
send_sig (current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
}
|