Linux-2.6.12-rc2v2.6.12-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!

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 0000000..fc4ad69
--- /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;
+	}
+}