patch-2.1.42 linux/arch/sparc64/kernel/ptrace.c

• Lines: 1029
• Date: Wed May 28 10:49:08 1997
• Orig file: v2.1.41/linux/arch/sparc64/kernel/ptrace.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.41/linux/arch/sparc64/kernel/ptrace.c linux/arch/sparc64/kernel/ptrace.c
@@ -0,0 +1,1028 @@
+/* ptrace.c: Sparc process tracing support.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ *
+ * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
+ * and David Mosberger.
+ *
+ * Added Linux support -miguel (wierd, eh?, the orignal code was meant
+ * to emulate SunOS).
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/psrcompat.h>
+
+#define MAGIC_CONSTANT 0x80000000
+
+/*
+ * This routine gets a long from any process space by following the page
+ * tables. NOTE! You should check that the long isn't on a page boundary,
+ * and that it is in the task area before calling this: this routine does
+ * no checking.
+ */
+static pte_t *get_page(struct task_struct * tsk,
+	struct vm_area_struct * vma, unsigned long addr, int write)
+{
+	pgd_t * pgdir;
+	pmd_t * pgmiddle;
+	pte_t * pgtable;
+
+repeat:
+	pgdir = pgd_offset(vma->vm_mm, addr);
+	if (pgd_none(*pgdir)) {
+		handle_mm_fault(tsk, vma, addr, write);
+		goto repeat;
+	}
+	if (pgd_bad(*pgdir)) {
+		printk("ptrace: bad page directory %016lx\n", pgd_val(*pgdir));
+		pgd_clear(pgdir);
+		return 0;
+	}
+	pgmiddle = pmd_offset(pgdir, addr);
+	if (pmd_none(*pgmiddle)) {
+		handle_mm_fault(tsk, vma, addr, write);
+		goto repeat;
+	}
+	if (pmd_bad(*pgmiddle)) {
+		printk("ptrace: bad page middle %016lx\n", pmd_val(*pgmiddle));
+		pmd_clear(pgmiddle);
+		return 0;
+	}
+	pgtable = pte_offset(pgmiddle, addr);
+	if (!pte_present(*pgtable)) {
+		handle_mm_fault(tsk, vma, addr, write);
+		goto repeat;
+	}
+	if (write && !pte_write(*pgtable)) {
+		handle_mm_fault(tsk, vma, addr, write);
+		goto repeat;
+	}
+	return pgtable;
+}
+
+static inline unsigned long get_long(struct task_struct * tsk,
+	struct vm_area_struct * vma, unsigned long addr)
+{
+	pte_t * pgtable;
+	unsigned long page, retval;
+	
+	if (!(pgtable = get_page (tsk, vma, addr, 0))) return 0;
+	page = pte_page(*pgtable);
+/* this is a hack for non-kernel-mapped video buffers and similar */
+	if (MAP_NR(page) >= max_mapnr)
+		return 0;
+	page += addr & ~PAGE_MASK;
+	retval = *(unsigned long *) page;
+	flush_page_to_ram(page);
+	return retval;
+}
+
+static inline void put_long(struct task_struct * tsk, struct vm_area_struct * vma,
+	unsigned long addr, unsigned long data)
+{
+	pte_t *pgtable;
+	unsigned long page;
+
+	if (!(pgtable = get_page (tsk, vma, addr, 1))) return;
+	page = pte_page(*pgtable);
+/* this is a hack for non-kernel-mapped video buffers and similar */
+	flush_cache_page(vma, addr);
+	if (MAP_NR(page) < max_mapnr) {
+		*(unsigned long *) (page + (addr & ~PAGE_MASK)) = data;
+		flush_page_to_ram(page);
+	}
+/* we're bypassing pagetables, so we have to set the dirty bit ourselves */
+/* this should also re-instate whatever read-only mode there was before */
+	set_pte(pgtable, pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
+	flush_tlb_page(vma, addr);
+}
+
+static inline unsigned int get_int(struct task_struct * tsk,
+	struct vm_area_struct * vma, unsigned long addr)
+{
+	pte_t * pgtable;
+	unsigned long page;
+	unsigned int retval;
+	
+	if (!(pgtable = get_page (tsk, vma, addr, 0))) return 0;
+	page = pte_page(*pgtable);
+/* this is a hack for non-kernel-mapped video buffers and similar */
+	if (MAP_NR(page) >= max_mapnr)
+		return 0;
+	page += addr & ~PAGE_MASK;
+	retval = *(unsigned int *) page;
+	flush_page_to_ram(page);
+	return retval;
+}
+
+static inline void put_int(struct task_struct * tsk, struct vm_area_struct * vma,
+	unsigned long addr, unsigned int data)
+{
+	pte_t *pgtable;
+	unsigned long page;
+
+	if (!(pgtable = get_page (tsk, vma, addr, 1))) return;
+	page = pte_page(*pgtable);
+/* this is a hack for non-kernel-mapped video buffers and similar */
+	flush_cache_page(vma, addr);
+	if (MAP_NR(page) < max_mapnr) {
+		*(unsigned int *) (page + (addr & ~PAGE_MASK)) = data;
+		flush_page_to_ram(page);
+	}
+/* we're bypassing pagetables, so we have to set the dirty bit ourselves */
+/* this should also re-instate whatever read-only mode there was before */
+	set_pte(pgtable, pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
+	flush_tlb_page(vma, addr);
+}
+
+static struct vm_area_struct * find_extend_vma(struct task_struct * tsk,
+					       unsigned long addr)
+{
+	struct vm_area_struct * vma;
+
+	addr &= PAGE_MASK;
+	vma = find_vma(tsk->mm,addr);
+	if (!vma)
+		return NULL;
+	if (vma->vm_start <= addr)
+		return vma;
+	if (!(vma->vm_flags & VM_GROWSDOWN))
+		return NULL;
+	if (vma->vm_end - addr > tsk->rlim[RLIMIT_STACK].rlim_cur)
+		return NULL;
+	vma->vm_offset -= vma->vm_start - addr;
+	vma->vm_start = addr;
+	return vma;
+}
+
+/*
+ * This routine checks the page boundaries, and that the offset is
+ * within the task area. It then calls get_long() to read a long.
+ */
+static int read_long(struct task_struct * tsk, unsigned long addr,
+		     unsigned long * result)
+{
+	struct vm_area_struct * vma = find_extend_vma(tsk, addr);
+
+	if (!vma)
+		return -EIO;
+	*result = get_long(tsk, vma, addr);
+	return 0;
+}
+
+/*
+ * This routine checks the page boundaries, and that the offset is
+ * within the task area. It then calls get_int() to read a int.
+ */
+static int read_int(struct task_struct * tsk, unsigned long addr,
+		     unsigned int * result)
+{
+	struct vm_area_struct * vma = find_extend_vma(tsk, addr);
+
+	if (!vma)
+		return -EIO;
+	*result = get_int(tsk, vma, addr);
+	return 0;
+}
+
+/*
+ * This routine checks the page boundaries, and that the offset is
+ * within the task area. It then calls put_long() to write a long.
+ */
+static int write_long(struct task_struct * tsk, unsigned long addr,
+		      unsigned long data)
+{
+	struct vm_area_struct * vma = find_extend_vma(tsk, addr);
+
+	if (!vma)
+		return -EIO;
+	put_long(tsk, vma, addr, data);
+	return 0;
+}
+
+/*
+ * This routine checks the page boundaries, and that the offset is
+ * within the task area. It then calls put_int() to write a int.
+ */
+static int write_int(struct task_struct * tsk, unsigned long addr,
+		     unsigned int data)
+{
+	struct vm_area_struct * vma = find_extend_vma(tsk, addr);
+
+	if (!vma)
+		return -EIO;
+	put_int(tsk, vma, addr, data);
+	return 0;
+}
+
+/* Returning from ptrace is a bit tricky because the syscall return
+ * low level code assumes any value returned which is negative and
+ * is a valid errno will mean setting the condition codes to indicate
+ * an error return.  This doesn't work, so we have this hook.
+ */
+static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
+{
+	regs->u_regs[UREG_I0] = error;
+	regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
+	regs->tpc = regs->tnpc;
+	regs->tnpc += 4;
+}
+
+static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
+{
+	regs->u_regs[UREG_I0] = value;
+	regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
+	regs->tpc = regs->tnpc;
+	regs->tnpc += 4;
+}
+
+static inline void
+pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long *addr)
+{
+	if (current->tss.flags & SPARC_FLAG_32BIT) {
+		if(put_user(value, (unsigned int *)addr))
+			return pt_error_return(regs, EFAULT);
+	} else {
+		if(put_user(value, addr))
+			return pt_error_return(regs, EFAULT);
+	}
+	regs->u_regs[UREG_I0] = 0;
+	regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
+	regs->tpc = regs->tnpc;
+	regs->tnpc += 4;
+}
+
+static void
+pt_os_succ_return (struct pt_regs *regs, unsigned long val, long *addr)
+{
+	if (current->personality & PER_BSD)
+		pt_succ_return (regs, val);
+	else
+		pt_succ_return_linux (regs, val, addr);
+}
+
+#if 0
+/* XXX: Implement this some day */
+/* Fuck me gently with a chainsaw... */
+static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
+				   struct task_struct *tsk, long *addr)
+{
+	struct pt_regs *cregs = tsk->tss.kregs;
+	struct thread_struct *t = &tsk->tss;
+	int v;
+	
+	if(offset >= 1024)
+		offset -= 1024; /* whee... */
+	if(offset & ((sizeof(unsigned int) - 1))) {
+		pt_error_return(regs, EIO);
+		return;
+	}
+	if(offset >= 16 && offset < 784) {
+		offset -= 16; offset >>= 2;
+		pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
+		return;
+	}
+	if(offset >= 784 && offset < 832) {
+		offset -= 784; offset >>= 2;
+		pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
+		return;
+	}
+	switch(offset) {
+	case 0:
+		v = t->ksp;
+		break;
+	case 4:
+		v = t->kpc;
+		break;
+	case 8:
+		v = t->kpsr;
+		break;
+	case 12:
+		v = t->uwinmask;
+		break;
+	case 832:
+		v = t->w_saved;
+		break;
+	case 896:
+		v = cregs->u_regs[UREG_I0];
+		break;
+	case 900:
+		v = cregs->u_regs[UREG_I1];
+		break;
+	case 904:
+		v = cregs->u_regs[UREG_I2];
+		break;
+	case 908:
+		v = cregs->u_regs[UREG_I3];
+		break;
+	case 912:
+		v = cregs->u_regs[UREG_I4];
+		break;
+	case 916:
+		v = cregs->u_regs[UREG_I5];
+		break;
+	case 920:
+		v = cregs->u_regs[UREG_I6];
+		break;
+	case 924:
+		if(tsk->tss.flags & MAGIC_CONSTANT)
+			v = cregs->u_regs[UREG_G1];
+		else
+			v = 0;
+		break;
+	case 940:
+		v = cregs->u_regs[UREG_I0];
+		break;
+	case 944:
+		v = cregs->u_regs[UREG_I1];
+		break;
+
+	case 948:
+		/* Isn't binary compatibility _fun_??? */
+		if(cregs->psr & PSR_C)
+			v = cregs->u_regs[UREG_I0] << 24;
+		else
+			v = 0;
+		break;
+
+		/* Rest of them are completely unsupported. */
+	default:
+		printk("%s [%d]: Wants to read user offset %ld\n",
+		       current->comm, current->pid, offset);
+		pt_error_return(regs, EIO);
+		return;
+	}
+	pt_os_succ_return_linux (regs, v, addr);
+	return;
+}
+
+static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
+				    struct task_struct *tsk)
+{
+	struct pt_regs *cregs = tsk->tss.kregs;
+	struct thread_struct *t = &tsk->tss;
+	unsigned int value = regs->u_regs[UREG_I3];
+
+	if(offset >= 1024)
+		offset -= 1024; /* whee... */
+	if(offset & ((sizeof(unsigned long) - 1)))
+		goto failure;
+	if(offset >= 16 && offset < 784) {
+		offset -= 16; offset >>= 2;
+		*(((unsigned long *)(&t->reg_window[0]))+offset) = value;
+		goto success;
+	}
+	if(offset >= 784 && offset < 832) {
+		offset -= 784; offset >>= 2;
+		*(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
+		goto success;
+	}
+	switch(offset) {
+	case 896:
+		cregs->u_regs[UREG_I0] = value;
+		break;
+	case 900:
+		cregs->u_regs[UREG_I1] = value;
+		break;
+	case 904:
+		cregs->u_regs[UREG_I2] = value;
+		break;
+	case 908:
+		cregs->u_regs[UREG_I3] = value;
+		break;
+	case 912:
+		cregs->u_regs[UREG_I4] = value;
+		break;
+	case 916:
+		cregs->u_regs[UREG_I5] = value;
+		break;
+	case 920:
+		cregs->u_regs[UREG_I6] = value;
+		break;
+	case 924:
+		cregs->u_regs[UREG_I7] = value;
+		break;
+	case 940:
+		cregs->u_regs[UREG_I0] = value;
+		break;
+	case 944:
+		cregs->u_regs[UREG_I1] = value;
+		break;
+
+		/* Rest of them are completely unsupported or "no-touch". */
+	default:
+		printk("%s [%d]: Wants to write user offset %ld\n",
+		       current->comm, current->pid, offset);
+		goto failure;
+	}
+success:
+	pt_succ_return(regs, 0);
+	return;
+failure:
+	pt_error_return(regs, EIO);
+	return;
+}
+#endif
+
+/* #define ALLOW_INIT_TRACING */
+/* #define DEBUG_PTRACE */
+
+#ifdef DEBUG_PTRACE
+char *pt_rq [] = {
+"TRACEME",
+"PEEKTEXT",
+"PEEKDATA",
+"PEEKUSR",
+"POKETEXT",
+"POKEDATA",
+"POKEUSR",
+"CONT",
+"KILL",
+"SINGLESTEP",
+"SUNATTACH",
+"SUNDETACH",
+"GETREGS",
+"SETREGS",
+"GETFPREGS",
+"SETFPREGS",
+"READDATA",
+"WRITEDATA",
+"READTEXT",
+"WRITETEXT",
+"GETFPAREGS",
+"SETFPAREGS",
+""
+};
+#endif
+
+asmlinkage void do_ptrace(struct pt_regs *regs)
+{
+	int request = regs->u_regs[UREG_I0];
+	pid_t pid = regs->u_regs[UREG_I1];
+	unsigned long addr = regs->u_regs[UREG_I2];
+	unsigned long data = regs->u_regs[UREG_I3];
+	unsigned long addr2 = regs->u_regs[UREG_I4];
+	struct task_struct *child;
+
+	if (current->tss.flags & SPARC_FLAG_32BIT) {
+		addr &= 0xffffffffUL;
+		data &= 0xffffffffUL;
+		addr2 &= 0xffffffffUL;
+	}
+	lock_kernel();
+#ifdef DEBUG_PTRACE
+	{
+		char *s;
+
+		if ((request > 0) && (request < 21))
+			s = pt_rq [request];
+		else
+			s = "unknown";
+
+		if (request == PTRACE_POKEDATA && data == 0x91d02001){
+			printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
+				pid, addr, addr2);
+		} else 
+			printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
+			       s, request, pid, addr, data, addr2);
+	}
+#endif
+	if(request == PTRACE_TRACEME) {
+		/* are we already being traced? */
+		if (current->flags & PF_PTRACED) {
+			pt_error_return(regs, EPERM);
+			goto out;
+		}
+		/* set the ptrace bit in the process flags. */
+		current->flags |= PF_PTRACED;
+		pt_succ_return(regs, 0);
+		goto out;
+	}
+#ifndef ALLOW_INIT_TRACING
+	if(pid == 1) {
+		/* Can't dork with init. */
+		pt_error_return(regs, EPERM);
+		goto out;
+	}
+#endif
+	if(!(child = find_task_by_pid(pid))) {
+		pt_error_return(regs, ESRCH);
+		goto out;
+	}
+
+	if (((current->personality & PER_BSD) && (request == PTRACE_SUNATTACH))
+	    || (!(current->personality & PER_BSD) && (request == PTRACE_ATTACH))) {
+		if(child == current) {
+			/* Try this under SunOS/Solaris, bwa haha
+			 * You'll never be able to kill the process. ;-)
+			 */
+			pt_error_return(regs, EPERM);
+			goto out;
+		}
+		if((!child->dumpable ||
+		    (current->uid != child->euid) ||
+		    (current->uid != child->uid) ||
+		    (current->gid != child->egid) ||
+		    (current->gid != child->gid)) && !suser()) {
+			pt_error_return(regs, EPERM);
+			goto out;
+		}
+		/* the same process cannot be attached many times */
+		if (child->flags & PF_PTRACED) {
+			pt_error_return(regs, EPERM);
+			goto out;
+		}
+		child->flags |= PF_PTRACED;
+		if(child->p_pptr != current) {
+			REMOVE_LINKS(child);
+			child->p_pptr = current;
+			SET_LINKS(child);
+		}
+		send_sig(SIGSTOP, child, 1);
+		pt_succ_return(regs, 0);
+		goto out;
+	}
+	if (!(child->flags & PF_PTRACED)
+	    && ((current->personality & PER_BSD) && (request != PTRACE_SUNATTACH))
+	    && (!(current->personality & PER_BSD) && (request != PTRACE_ATTACH))) {
+		pt_error_return(regs, ESRCH);
+		goto out;
+	}
+	if(child->state != TASK_STOPPED) {
+		if(request != PTRACE_KILL) {
+			pt_error_return(regs, ESRCH);
+			goto out;
+		}
+	}
+	if(child->p_pptr != current) {
+		pt_error_return(regs, ESRCH);
+		goto out;
+	}
+	switch(request) {
+	case PTRACE_PEEKTEXT: /* read word at location addr. */ 
+	case PTRACE_PEEKDATA: {
+		unsigned long tmp;
+		int res;
+
+#if 0
+		/* XXX Find out what is really going on. */
+		flush_cache_all();
+#endif
+		/* Non-word alignment _not_ allowed on Sparc. */
+		if (current->tss.flags & SPARC_FLAG_32BIT) {
+			unsigned int x;
+			if(addr & (sizeof(unsigned int) - 1)) {
+				pt_error_return(regs, EINVAL);
+				goto out;
+			}
+			res = read_int(child, addr, &x);
+			tmp = x;
+		} else {
+			if(addr & (sizeof(unsigned long) - 1)) {
+				pt_error_return(regs, EINVAL);
+				goto out;
+			}
+			res = read_long(child, addr, &tmp);
+		}
+		if (res < 0) {
+			pt_error_return(regs, -res);
+			goto out;
+		}
+		pt_os_succ_return(regs, tmp, (long *) data);
+		goto out;
+	}
+
+	case PTRACE_PEEKUSR:
+#if 0	
+		read_sunos_user(regs, addr, child, (long *) data);
+#endif
+		goto out;
+
+	case PTRACE_POKEUSR:
+#if 0	
+		write_sunos_user(regs, addr, child);
+#endif		
+		goto out;
+
+	case PTRACE_POKETEXT: /* write the word at location addr. */
+	case PTRACE_POKEDATA: {
+		int res;
+
+		/* Non-word alignment _not_ allowed on Sparc. */
+		if (current->tss.flags & SPARC_FLAG_32BIT) {
+			if(addr & (sizeof(unsigned int) - 1)) {
+				pt_error_return(regs, EINVAL);
+				goto out;
+			}
+			res = write_int(child, addr, data);
+		} else {
+			if(addr & (sizeof(unsigned long) - 1)) {
+				pt_error_return(regs, EINVAL);
+				goto out;
+			}
+			res = write_long(child, addr, data);
+		}
+		if(res < 0)
+			pt_error_return(regs, -res);
+		else
+			pt_succ_return(regs, res);
+		goto out;
+	}
+
+	case PTRACE_GETREGS: 
+		if (current->tss.flags & SPARC_FLAG_32BIT) {
+			struct pt_regs32 *pregs = (struct pt_regs32 *) addr;
+			struct pt_regs *cregs = child->tss.kregs;
+			int rval;
+
+			if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
+			    __put_user(cregs->tpc, (&pregs->pc)) ||
+			    __put_user(cregs->tnpc, (&pregs->npc)) ||
+			    __put_user(cregs->y, (&pregs->y))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			for(rval = 1; rval < 16; rval++)
+				if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
+					pt_error_return(regs, EFAULT);
+					goto out;
+				}
+			pt_succ_return(regs, 0);
+#ifdef DEBUG_PTRACE
+			printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
+#endif
+			goto out;
+		} else {
+			struct pt_regs *pregs = (struct pt_regs *) addr;
+			struct pt_regs *cregs = child->tss.kregs;
+			int rval;
+
+			if (__put_user(cregs->tstate, (&pregs->tstate)) ||
+			    __put_user(cregs->tpc, (&pregs->tpc)) ||
+			    __put_user(cregs->tnpc, (&pregs->tnpc)) ||
+			    __put_user(cregs->y, (&pregs->y))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			for(rval = 1; rval < 16; rval++)
+				if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
+					pt_error_return(regs, EFAULT);
+					goto out;
+				}
+			pt_succ_return(regs, 0);
+#ifdef DEBUG_PTRACE
+			printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
+#endif
+			goto out;
+		}
+
+	case PTRACE_SETREGS: 
+		if (current->tss.flags & SPARC_FLAG_32BIT) {
+			struct pt_regs32 *pregs = (struct pt_regs32 *) addr;
+			struct pt_regs *cregs = child->tss.kregs;
+			unsigned int psr, pc, npc, y;
+			int i;
+
+			/* Must be careful, tracing process can only set certain
+			 * bits in the psr.
+			 */
+			if (__get_user(psr, (&pregs->psr)) ||
+			    __get_user(pc, (&pregs->pc)) ||
+			    __get_user(npc, (&pregs->npc)) ||
+			    __get_user(y, (&pregs->y))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			cregs->tstate &= ~(TSTATE_ICC);
+			cregs->tstate |= psr_to_tstate_icc(psr);
+                	if(!((pc | npc) & 3)) {
+				cregs->tpc = pc;
+				cregs->tpc = npc;
+			}
+			cregs->y = y;
+			for(i = 1; i < 16; i++)
+				if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
+					pt_error_return(regs, EFAULT);
+					goto out;
+				}
+			pt_succ_return(regs, 0);
+			goto out;
+		} else {
+			struct pt_regs *pregs = (struct pt_regs *) addr;
+			struct pt_regs *cregs = child->tss.kregs;
+			unsigned long tstate, tpc, tnpc, y;
+			int i;
+
+			/* Must be careful, tracing process can only set certain
+			 * bits in the psr.
+			 */
+			if (__get_user(tstate, (&pregs->tstate)) ||
+			    __get_user(tpc, (&pregs->tpc)) ||
+			    __get_user(tnpc, (&pregs->tnpc)) ||
+			    __get_user(y, (&pregs->y))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			tstate &= (TSTATE_ICC | TSTATE_XCC);
+			cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
+			cregs->tstate |= tstate;
+			if(!((tpc | tnpc) & 3)) {
+				cregs->tpc = tpc;
+				cregs->tnpc = tnpc;
+			}
+			cregs->y = y;
+			for(i = 1; i < 16; i++)
+				if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
+					pt_error_return(regs, EFAULT);
+					goto out;
+				}
+			pt_succ_return(regs, 0);
+			goto out;
+		}
+
+	case PTRACE_GETFPREGS: 
+		if (current->tss.flags & SPARC_FLAG_32BIT) {
+			struct fps {
+				unsigned int regs[32];
+				unsigned int fsr;
+				unsigned int flags;
+				unsigned int extra;
+				unsigned int fpqd;
+				struct fq {
+					unsigned int insnaddr;
+					unsigned int insn;
+				} fpq[16];
+			} *fps = (struct fps *) addr;
+
+			if (copy_to_user(&fps->regs[0], &child->tss.float_regs[0], (32 * sizeof(unsigned int))) ||
+			    __put_user(child->tss.fsr, (&fps->fsr)) ||
+			    __put_user(0, (&fps->fpqd)) ||
+			    __put_user(0, (&fps->flags)) ||
+			    __put_user(0, (&fps->extra)) ||
+			    clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			pt_succ_return(regs, 0);
+			goto out;
+		} else {
+			struct fps {
+				unsigned int regs[64];
+				unsigned long fsr;
+			} *fps = (struct fps *) addr;
+
+			if (copy_to_user(&fps->regs[0], &child->tss.float_regs[0], (64 * sizeof(unsigned int))) ||
+			    __put_user(child->tss.fsr, (&fps->fsr))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			pt_succ_return(regs, 0);
+			goto out;
+		}
+
+	case PTRACE_SETFPREGS:
+		if (current->tss.flags & SPARC_FLAG_32BIT) {
+			struct fps {
+				unsigned int regs[32];
+				unsigned int fsr;
+				unsigned int flags;
+				unsigned int extra;
+				unsigned int fpqd;
+				struct fq {
+					unsigned int insnaddr;
+					unsigned int insn;
+				} fpq[16];
+			} *fps = (struct fps *) addr;
+			unsigned fsr;
+
+			if (copy_from_user(&child->tss.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned int))) ||
+			    __get_user(fsr, (&fps->fsr))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			child->tss.fsr &= 0xffffffff00000000UL;
+			child->tss.fsr |= fsr;
+			pt_succ_return(regs, 0);
+			goto out;
+		} else {
+			struct fps {
+				unsigned int regs[64];
+				unsigned long fsr;
+			} *fps = (struct fps *) addr;
+
+			if (copy_from_user(&child->tss.float_regs[0], &fps->regs[0], (64 * sizeof(unsigned int))) ||
+			    __get_user(child->tss.fsr, (&fps->fsr))) {
+				pt_error_return(regs, EFAULT);
+				goto out;
+			}
+			pt_succ_return(regs, 0);
+			goto out;
+		}
+
+	case PTRACE_READTEXT:
+	case PTRACE_READDATA: {
+		unsigned char *dest = (unsigned char *) addr2;
+		unsigned long src = addr;
+		int len = data, curlen;
+		struct vm_area_struct *vma;
+		pte_t *pgtable;
+		unsigned long page;
+
+		while(len) {
+			vma = find_extend_vma(child, src);
+			if (!vma) {
+				pt_error_return(regs, EIO);
+				goto out;
+			}
+			pgtable = get_page (child, vma, src, 0);
+			if (src & ~PAGE_MASK) {
+				curlen = PAGE_SIZE - (src & ~PAGE_MASK);
+				if (curlen > len) curlen = len;
+			} else if (len > PAGE_SIZE)
+				curlen = PAGE_SIZE;
+			else
+				curlen = len;
+			if (pgtable && MAP_NR(page = pte_page(*pgtable)) < max_mapnr) {
+				if (copy_to_user (dest, ((char *)page) + (src & ~PAGE_MASK), curlen)) {
+					flush_page_to_ram(page);
+					pt_error_return(regs, EFAULT);
+					goto out;
+				}
+				flush_page_to_ram(page);
+			} else {
+				if (clear_user (dest, curlen)) {
+					pt_error_return(regs, EFAULT);
+					goto out;
+				}
+			}
+			src += curlen;
+			dest += curlen;
+			len -= curlen;
+		}
+		pt_succ_return(regs, 0);
+		goto out;
+	}
+
+	case PTRACE_WRITETEXT:
+	case PTRACE_WRITEDATA: {
+		unsigned char *src = (unsigned char *) addr2;
+		unsigned long dest = addr;
+		int len = data, curlen;
+		struct vm_area_struct *vma;
+		pte_t *pgtable;
+		unsigned long page;
+
+		while(len) {
+			vma = find_extend_vma(child, dest);
+			if (!vma) {
+				pt_error_return(regs, EIO);
+				goto out;
+			}
+			pgtable = get_page (child, vma, dest, 1);
+			if (dest & ~PAGE_MASK) {
+				curlen = PAGE_SIZE - (dest & ~PAGE_MASK);
+				if (curlen > len) curlen = len;
+			} else if (len > PAGE_SIZE)
+				curlen = PAGE_SIZE;
+			else
+				curlen = len;
+			if (pgtable && MAP_NR(page = pte_page(*pgtable)) < max_mapnr) {
+				flush_cache_page(vma, dest);
+				if (copy_from_user (((char *)page) + (dest & ~PAGE_MASK), src, curlen)) {
+					flush_page_to_ram(page);
+					set_pte(pgtable, pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
+					flush_tlb_page(vma, dest);
+					pt_error_return(regs, EFAULT);
+					goto out;
+				}
+				flush_page_to_ram(page);
+				set_pte(pgtable, pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
+				flush_tlb_page(vma, dest);
+			}
+			src += curlen;
+			dest += curlen;
+			len -= curlen;
+		}
+		pt_succ_return(regs, 0);
+		goto out;
+	}
+
+	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;
+		}
+		if (addr != 1) {
+			if (addr & 3) {
+				pt_error_return(regs, EINVAL);
+				goto out;
+			}
+#ifdef DEBUG_PTRACE
+			printk ("Original: %016lx %016lx\n", child->tss.kregs->tpc, child->tss.kregs->tnpc);
+			printk ("Continuing with %016lx %016lx\n", addr, addr+4);
+#endif
+			child->tss.kregs->tpc = addr;
+			child->tss.kregs->tnpc = addr + 4;
+		}
+
+		if (request == PTRACE_SYSCALL)
+			child->flags |= PF_TRACESYS;
+		else
+			child->flags &= ~PF_TRACESYS;
+
+		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->tss.kregs->tpc,
+			child->tss.kregs->tnpc);
+		       
+#endif
+		wake_up_process(child);
+		pt_succ_return(regs, 0);
+		goto out;
+	}
+
+/*
+ * 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->state == TASK_ZOMBIE) {	/* already dead */
+			pt_succ_return(regs, 0);
+			goto out;
+		}
+		wake_up_process(child);
+		child->exit_code = SIGKILL;
+		pt_succ_return(regs, 0);
+		goto out;
+	}
+
+	case PTRACE_SUNDETACH: { /* detach a process that was attached. */
+		if ((unsigned long) data > NSIG) {
+			pt_error_return(regs, EIO);
+			goto out;
+		}
+		child->flags &= ~(PF_PTRACED|PF_TRACESYS);
+		wake_up_process(child);
+		child->exit_code = data;
+		REMOVE_LINKS(child);
+		child->p_pptr = child->p_opptr;
+		SET_LINKS(child);
+		pt_succ_return(regs, 0);
+		goto out;
+	}
+
+	/* PTRACE_DUMPCORE unsupported... */
+
+	default:
+		pt_error_return(regs, EIO);
+		goto out;
+	}
+out:
+	unlock_kernel();
+}
+
+asmlinkage void syscall_trace(void)
+{
+#ifdef DEBUG_PTRACE
+	printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
+#endif
+	if ((current->flags & (PF_PTRACED|PF_TRACESYS))
+			!= (PF_PTRACED|PF_TRACESYS))
+		return;
+	current->exit_code = SIGTRAP;
+	current->state = TASK_STOPPED;
+	current->tss.flags ^= MAGIC_CONSTANT;
+	notify_parent(current);
+	schedule();
+	/*
+	 * 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) {
+		set_bit(current->exit_code + 31, &current->signal);
+	}
+	current->exit_code = 0;
+}