Linux-2.6.12-rc2
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!
diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
new file mode 100644
index 0000000..1722dc5
--- /dev/null
+++ b/arch/sparc64/kernel/ptrace.c
@@ -0,0 +1,646 @@
+/* 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 (weird, eh?, the original 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/asi.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/psrcompat.h>
+#include <asm/visasm.h>
+#include <asm/spitfire.h>
+
+/* 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, void __user *addr)
+{
+ if (test_thread_flag(TIF_32BIT)) {
+ if (put_user(value, (unsigned int __user *) addr)) {
+ pt_error_return(regs, EFAULT);
+ return;
+ }
+ } else {
+ if (put_user(value, (long __user *) addr)) {
+ pt_error_return(regs, EFAULT);
+ return;
+ }
+ }
+ 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, void __user *addr)
+{
+ if (current->personality == PER_SUNOS)
+ pt_succ_return (regs, val);
+ else
+ pt_succ_return_linux (regs, val, addr);
+}
+
+/* #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)
+{
+ 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;
+ int ret;
+
+ if (test_thread_flag(TIF_32BIT)) {
+ addr &= 0xffffffffUL;
+ data &= 0xffffffffUL;
+ addr2 &= 0xffffffffUL;
+ }
+ 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=%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) {
+ int ret;
+
+ /* are we already being traced? */
+ if (current->ptrace & PT_PTRACED) {
+ pt_error_return(regs, EPERM);
+ goto out;
+ }
+ ret = security_ptrace(current->parent, current);
+ if (ret) {
+ pt_error_return(regs, -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;
+ }
+
+ if (!(test_thread_flag(TIF_32BIT)) &&
+ ((request == PTRACE_READDATA64) ||
+ (request == PTRACE_WRITEDATA64) ||
+ (request == PTRACE_READTEXT64) ||
+ (request == PTRACE_WRITETEXT64) ||
+ (request == PTRACE_PEEKTEXT64) ||
+ (request == PTRACE_POKETEXT64) ||
+ (request == PTRACE_PEEKDATA64) ||
+ (request == PTRACE_POKEDATA64))) {
+ addr = regs->u_regs[UREG_G2];
+ addr2 = regs->u_regs[UREG_G3];
+ request -= 30; /* wheee... */
+ }
+
+ switch(request) {
+ case PTRACE_PEEKTEXT: /* read word at location addr. */
+ case PTRACE_PEEKDATA: {
+ unsigned long tmp64;
+ unsigned int tmp32;
+ int res, copied;
+
+ res = -EIO;
+ if (test_thread_flag(TIF_32BIT)) {
+ copied = access_process_vm(child, addr,
+ &tmp32, sizeof(tmp32), 0);
+ tmp64 = (unsigned long) tmp32;
+ if (copied == sizeof(tmp32))
+ res = 0;
+ } else {
+ copied = access_process_vm(child, addr,
+ &tmp64, sizeof(tmp64), 0);
+ if (copied == sizeof(tmp64))
+ res = 0;
+ }
+ if (res < 0)
+ pt_error_return(regs, -res);
+ else
+ pt_os_succ_return(regs, tmp64, (void __user *) data);
+ goto flush_and_out;
+ }
+
+ case PTRACE_POKETEXT: /* write the word at location addr. */
+ case PTRACE_POKEDATA: {
+ unsigned long tmp64;
+ unsigned int tmp32;
+ int copied, res = -EIO;
+
+ if (test_thread_flag(TIF_32BIT)) {
+ tmp32 = data;
+ copied = access_process_vm(child, addr,
+ &tmp32, sizeof(tmp32), 1);
+ if (copied == sizeof(tmp32))
+ res = 0;
+ } else {
+ tmp64 = data;
+ copied = access_process_vm(child, addr,
+ &tmp64, sizeof(tmp64), 1);
+ if (copied == sizeof(tmp64))
+ res = 0;
+ }
+ if (res < 0)
+ pt_error_return(regs, -res);
+ else
+ pt_succ_return(regs, res);
+ goto flush_and_out;
+ }
+
+ case PTRACE_GETREGS: {
+ struct pt_regs32 __user *pregs =
+ (struct pt_regs32 __user *) addr;
+ struct pt_regs *cregs = child->thread_info->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_tsk;
+ }
+ 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_tsk;
+ }
+ 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_tsk;
+ }
+
+ case PTRACE_GETREGS64: {
+ struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
+ struct pt_regs *cregs = child->thread_info->kregs;
+ unsigned long tpc = cregs->tpc;
+ int rval;
+
+ if ((child->thread_info->flags & _TIF_32BIT) != 0)
+ tpc &= 0xffffffff;
+ if (__put_user(cregs->tstate, (&pregs->tstate)) ||
+ __put_user(tpc, (&pregs->tpc)) ||
+ __put_user(cregs->tnpc, (&pregs->tnpc)) ||
+ __put_user(cregs->y, (&pregs->y))) {
+ pt_error_return(regs, EFAULT);
+ goto out_tsk;
+ }
+ 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_tsk;
+ }
+ 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_tsk;
+ }
+
+ case PTRACE_SETREGS: {
+ struct pt_regs32 __user *pregs =
+ (struct pt_regs32 __user *) addr;
+ struct pt_regs *cregs = child->thread_info->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_tsk;
+ }
+ cregs->tstate &= ~(TSTATE_ICC);
+ cregs->tstate |= psr_to_tstate_icc(psr);
+ if (!((pc | npc) & 3)) {
+ cregs->tpc = pc;
+ cregs->tnpc = 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_tsk;
+ }
+ }
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_SETREGS64: {
+ struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
+ struct pt_regs *cregs = child->thread_info->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_tsk;
+ }
+ if ((child->thread_info->flags & _TIF_32BIT) != 0) {
+ tpc &= 0xffffffff;
+ tnpc &= 0xffffffff;
+ }
+ 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_tsk;
+ }
+ }
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_GETFPREGS: {
+ 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];
+ };
+ struct fps __user *fps = (struct fps __user *) addr;
+ unsigned long *fpregs = child->thread_info->fpregs;
+
+ if (copy_to_user(&fps->regs[0], fpregs,
+ (32 * sizeof(unsigned int))) ||
+ __put_user(child->thread_info->xfsr[0], (&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_tsk;
+ }
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_GETFPREGS64: {
+ struct fps {
+ unsigned int regs[64];
+ unsigned long fsr;
+ };
+ struct fps __user *fps = (struct fps __user *) addr;
+ unsigned long *fpregs = child->thread_info->fpregs;
+
+ if (copy_to_user(&fps->regs[0], fpregs,
+ (64 * sizeof(unsigned int))) ||
+ __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
+ pt_error_return(regs, EFAULT);
+ goto out_tsk;
+ }
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_SETFPREGS: {
+ 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];
+ };
+ struct fps __user *fps = (struct fps __user *) addr;
+ unsigned long *fpregs = child->thread_info->fpregs;
+ unsigned fsr;
+
+ if (copy_from_user(fpregs, &fps->regs[0],
+ (32 * sizeof(unsigned int))) ||
+ __get_user(fsr, (&fps->fsr))) {
+ pt_error_return(regs, EFAULT);
+ goto out_tsk;
+ }
+ child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
+ child->thread_info->xfsr[0] |= fsr;
+ if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
+ child->thread_info->gsr[0] = 0;
+ child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_SETFPREGS64: {
+ struct fps {
+ unsigned int regs[64];
+ unsigned long fsr;
+ };
+ struct fps __user *fps = (struct fps __user *) addr;
+ unsigned long *fpregs = child->thread_info->fpregs;
+
+ if (copy_from_user(fpregs, &fps->regs[0],
+ (64 * sizeof(unsigned int))) ||
+ __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
+ pt_error_return(regs, EFAULT);
+ goto out_tsk;
+ }
+ if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
+ child->thread_info->gsr[0] = 0;
+ child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_READTEXT:
+ case PTRACE_READDATA: {
+ int res = ptrace_readdata(child, addr,
+ (char __user *)addr2, data);
+ if (res == data) {
+ pt_succ_return(regs, 0);
+ goto flush_and_out;
+ }
+ if (res >= 0)
+ res = -EIO;
+ pt_error_return(regs, -res);
+ goto flush_and_out;
+ }
+
+ case PTRACE_WRITETEXT:
+ case PTRACE_WRITEDATA: {
+ int res = ptrace_writedata(child, (char __user *) addr2,
+ addr, data);
+ if (res == data) {
+ pt_succ_return(regs, 0);
+ goto flush_and_out;
+ }
+ if (res >= 0)
+ res = -EIO;
+ pt_error_return(regs, -res);
+ goto flush_and_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_tsk;
+ }
+ if (addr != 1) {
+ unsigned long pc_mask = ~0UL;
+
+ if ((child->thread_info->flags & _TIF_32BIT) != 0)
+ pc_mask = 0xffffffff;
+
+ if (addr & 3) {
+ pt_error_return(regs, EINVAL);
+ goto out_tsk;
+ }
+#ifdef DEBUG_PTRACE
+ printk ("Original: %016lx %016lx\n",
+ child->thread_info->kregs->tpc,
+ child->thread_info->kregs->tnpc);
+ printk ("Continuing with %016lx %016lx\n", addr, addr+4);
+#endif
+ child->thread_info->kregs->tpc = (addr & pc_mask);
+ child->thread_info->kregs->tnpc = ((addr + 4) & pc_mask);
+ }
+
+ 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_info->kregs->tpc,
+ child->thread_info->kregs->tnpc);
+
+#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;
+ }
+ child->exit_code = SIGKILL;
+ wake_up_process(child);
+ pt_succ_return(regs, 0);
+ goto out_tsk;
+ }
+
+ case PTRACE_SUNDETACH: { /* detach a process that was attached. */
+ int error = ptrace_detach(child, data);
+ if (error) {
+ 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;
+ }
+ }
+flush_and_out:
+ {
+ unsigned long va;
+
+ if (tlb_type == cheetah || tlb_type == cheetah_plus) {
+ for (va = 0; va < (1 << 16); va += (1 << 5))
+ spitfire_put_dcache_tag(va, 0x0);
+ /* No need to mess with I-cache on Cheetah. */
+ } else {
+ for (va = 0; va < L1DCACHE_SIZE; va += 32)
+ spitfire_put_dcache_tag(va, 0x0);
+ if (request == PTRACE_PEEKTEXT ||
+ request == PTRACE_POKETEXT ||
+ request == PTRACE_READTEXT ||
+ request == PTRACE_WRITETEXT) {
+ for (va = 0; va < (PAGE_SIZE << 1); va += 32)
+ spitfire_put_icache_tag(va, 0x0);
+ __asm__ __volatile__("flush %g6");
+ }
+ }
+ }
+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;
+ 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;
+ }
+}