summaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/ptrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/ptrace.c')
-rw-r--r--arch/sparc/kernel/ptrace.c632
1 files changed, 632 insertions, 0 deletions
diff --git a/arch/sparc/kernel/ptrace.c b/arch/sparc/kernel/ptrace.c
new file mode 100644
index 000000000000..fc4ad69357b8
--- /dev/null
+++ b/arch/sparc/kernel/ptrace.c
@@ -0,0 +1,632 @@
+/* ptrace.c: Sparc process tracing support.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
+ *
+ * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
+ * and David Mosberger.
+ *
+ * Added Linux support -miguel (weird, 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 <linux/security.h>
+
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#define MAGIC_CONSTANT 0x80000000
+
+
+/* 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->psr |= PSR_C;
+ regs->pc = regs->npc;
+ regs->npc += 4;
+}
+
+static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
+{
+ regs->u_regs[UREG_I0] = value;
+ regs->psr &= ~PSR_C;
+ regs->pc = regs->npc;
+ regs->npc += 4;
+}
+
+static void
+pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr)
+{
+ if (put_user(value, addr)) {
+ pt_error_return(regs, EFAULT);
+ return;
+ }
+ regs->u_regs[UREG_I0] = 0;
+ regs->psr &= ~PSR_C;
+ regs->pc = regs->npc;
+ regs->npc += 4;
+}
+
+static void
+pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr)
+{
+ if (current->personality == PER_SUNOS)
+ pt_succ_return (regs, val);
+ else
+ pt_succ_return_linux (regs, val, addr);
+}
+
+/* Fuck me gently with a chainsaw... */
+static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
+ struct task_struct *tsk, long __user *addr)
+{
+ struct pt_regs *cregs = tsk->thread.kregs;
+ struct thread_info *t = tsk->thread_info;
+ int v;
+
+ if(offset >= 1024)
+ offset -= 1024; /* whee... */
+ if(offset & ((sizeof(unsigned long) - 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->thread.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;
+ }
+ if (current->personality == PER_SUNOS)
+ pt_succ_return (regs, v);
+ else
+ pt_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->thread.kregs;
+ struct thread_info *t = tsk->thread_info;
+ unsigned long 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;
+}
+
+/* #define ALLOW_INIT_TRACING */
+/* #define DEBUG_PTRACE */
+
+#ifdef DEBUG_PTRACE
+char *pt_rq [] = {
+ /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
+ /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
+ /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
+ /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
+ /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
+ /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
+ /* 24 */ "SYSCALL", ""
+};
+#endif
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure single step bits etc are not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+ /* nothing to do */
+}
+
+asmlinkage void do_ptrace(struct pt_regs *regs)
+{
+ unsigned long request = regs->u_regs[UREG_I0];
+ unsigned long 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;
+ int ret;
+
+ lock_kernel();
+#ifdef DEBUG_PTRACE
+ {
+ char *s;
+
+ if ((request >= 0) && (request <= 24))
+ s = pt_rq [request];
+ else
+ s = "unknown";
+
+ if (request == PTRACE_POKEDATA && data == 0x91d02001){
+ printk ("do_ptrace: breakpoint pid=%d, addr=%08lx addr2=%08lx\n",
+ pid, addr, addr2);
+ } else
+ printk("do_ptrace: rq=%s(%d) pid=%d addr=%08lx data=%08lx addr2=%08lx\n",
+ s, (int) request, (int) pid, addr, data, addr2);
+ }
+#endif
+ if (request == PTRACE_TRACEME) {
+ int my_ret;
+
+ /* are we already being traced? */
+ if (current->ptrace & PT_PTRACED) {
+ pt_error_return(regs, EPERM);
+ goto out;
+ }
+ my_ret = security_ptrace(current->parent, current);
+ if (my_ret) {
+ pt_error_return(regs, -my_ret);
+ goto out;
+ }
+
+ /* set the ptrace bit in the process flags. */
+ current->ptrace |= PT_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
+ read_lock(&tasklist_lock);
+ child = find_task_by_pid(pid);
+ if (child)
+ get_task_struct(child);
+ read_unlock(&tasklist_lock);
+
+ if (!child) {
+ pt_error_return(regs, ESRCH);
+ goto out;
+ }
+
+ if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
+ || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
+ if (ptrace_attach(child)) {
+ pt_error_return(regs, EPERM);
+ goto out_tsk;
+ }
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ ret = ptrace_check_attach(child, request == PTRACE_KILL);
+ if (ret < 0) {
+ pt_error_return(regs, -ret);
+ goto out_tsk;
+ }
+
+ switch(request) {
+ case PTRACE_PEEKTEXT: /* read word at location addr. */
+ case PTRACE_PEEKDATA: {
+ unsigned long tmp;
+
+ if (access_process_vm(child, addr,
+ &tmp, sizeof(tmp), 0) == sizeof(tmp))
+ pt_os_succ_return(regs, tmp, (long __user *)data);
+ else
+ pt_error_return(regs, EIO);
+ goto out_tsk;
+ }
+
+ case PTRACE_PEEKUSR:
+ read_sunos_user(regs, addr, child, (long __user *) data);
+ goto out_tsk;
+
+ case PTRACE_POKEUSR:
+ write_sunos_user(regs, addr, child);
+ goto out_tsk;
+
+ case PTRACE_POKETEXT: /* write the word at location addr. */
+ case PTRACE_POKEDATA: {
+ if (access_process_vm(child, addr,
+ &data, sizeof(data), 1) == sizeof(data))
+ pt_succ_return(regs, 0);
+ else
+ pt_error_return(regs, EIO);
+ goto out_tsk;
+ }
+
+ case PTRACE_GETREGS: {
+ struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
+ struct pt_regs *cregs = child->thread.kregs;
+ int rval;
+
+ if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
+ rval = -EFAULT;
+ pt_error_return(regs, -rval);
+ goto out_tsk;
+ }
+ __put_user(cregs->psr, (&pregs->psr));
+ __put_user(cregs->pc, (&pregs->pc));
+ __put_user(cregs->npc, (&pregs->npc));
+ __put_user(cregs->y, (&pregs->y));
+ for(rval = 1; rval < 16; rval++)
+ __put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
+ pt_succ_return(regs, 0);
+#ifdef DEBUG_PTRACE
+ printk ("PC=%x nPC=%x o7=%x\n", cregs->pc, cregs->npc, cregs->u_regs [15]);
+#endif
+ goto out_tsk;
+ }
+
+ case PTRACE_SETREGS: {
+ struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
+ struct pt_regs *cregs = child->thread.kregs;
+ unsigned long psr, pc, npc, y;
+ int i;
+
+ /* Must be careful, tracing process can only set certain
+ * bits in the psr.
+ */
+ if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
+ pt_error_return(regs, EFAULT);
+ goto out_tsk;
+ }
+ __get_user(psr, (&pregs->psr));
+ __get_user(pc, (&pregs->pc));
+ __get_user(npc, (&pregs->npc));
+ __get_user(y, (&pregs->y));
+ psr &= PSR_ICC;
+ cregs->psr &= ~PSR_ICC;
+ cregs->psr |= psr;
+ if (!((pc | npc) & 3)) {
+ cregs->pc = pc;
+ cregs->npc =npc;
+ }
+ cregs->y = y;
+ for(i = 1; i < 16; i++)
+ __get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_GETFPREGS: {
+ struct fps {
+ unsigned long regs[32];
+ unsigned long fsr;
+ unsigned long flags;
+ unsigned long extra;
+ unsigned long fpqd;
+ struct fq {
+ unsigned long *insnaddr;
+ unsigned long insn;
+ } fpq[16];
+ };
+ struct fps __user *fps = (struct fps __user *) addr;
+ int i;
+
+ if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
+ i = -EFAULT;
+ pt_error_return(regs, -i);
+ goto out_tsk;
+ }
+ for(i = 0; i < 32; i++)
+ __put_user(child->thread.float_regs[i], (&fps->regs[i]));
+ __put_user(child->thread.fsr, (&fps->fsr));
+ __put_user(child->thread.fpqdepth, (&fps->fpqd));
+ __put_user(0, (&fps->flags));
+ __put_user(0, (&fps->extra));
+ for(i = 0; i < 16; i++) {
+ __put_user(child->thread.fpqueue[i].insn_addr,
+ (&fps->fpq[i].insnaddr));
+ __put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
+ }
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_SETFPREGS: {
+ struct fps {
+ unsigned long regs[32];
+ unsigned long fsr;
+ unsigned long flags;
+ unsigned long extra;
+ unsigned long fpqd;
+ struct fq {
+ unsigned long *insnaddr;
+ unsigned long insn;
+ } fpq[16];
+ };
+ struct fps __user *fps = (struct fps __user *) addr;
+ int i;
+
+ if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
+ i = -EFAULT;
+ pt_error_return(regs, -i);
+ goto out_tsk;
+ }
+ copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
+ __get_user(child->thread.fsr, (&fps->fsr));
+ __get_user(child->thread.fpqdepth, (&fps->fpqd));
+ for(i = 0; i < 16; i++) {
+ __get_user(child->thread.fpqueue[i].insn_addr,
+ (&fps->fpq[i].insnaddr));
+ __get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
+ }
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_READTEXT:
+ case PTRACE_READDATA: {
+ int res = ptrace_readdata(child, addr,
+ (void __user *) addr2, data);
+
+ if (res == data) {
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+ /* Partial read is an IO failure */
+ 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;
+ }
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-09 09:32:11 +0000