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, 646 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
new file mode 100644
index 00000000000..1722dc51b0d
--- /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;
+	}
+}