X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Falpha%2Fkernel%2Fptrace.c;h=1e9ad52c460ec293aa70f9cbc5bb3094adc08d74;hb=0c326331c8b107abc0a160e8899d749150b8f76a;hp=9969d212e94d9d4b16da2f66921f8b206822612e;hpb=05814450070f13b671fc9dbf89477677aa0258cb;p=pandora-kernel.git

diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
index 9969d212e94d..1e9ad52c460e 100644
--- a/arch/alpha/kernel/ptrace.c
+++ b/arch/alpha/kernel/ptrace.c
@@ -72,6 +72,13 @@ enum {
 	REG_R0 = 0, REG_F0 = 32, REG_FPCR = 63, REG_PC = 64
 };
 
+#define PT_REG(reg) \
+  (PAGE_SIZE*2 - sizeof(struct pt_regs) + offsetof(struct pt_regs, reg))
+
+#define SW_REG(reg) \
+ (PAGE_SIZE*2 - sizeof(struct pt_regs) - sizeof(struct switch_stack) \
+  + offsetof(struct switch_stack, reg))
+
 static int regoff[] = {
 	PT_REG(	   r0), PT_REG(	   r1), PT_REG(	   r2), PT_REG(	  r3),
 	PT_REG(	   r4), PT_REG(	   r5), PT_REG(	   r6), PT_REG(	  r7),
@@ -103,14 +110,14 @@ get_reg_addr(struct task_struct * task, unsigned long regno)
 	unsigned long *addr;
 
 	if (regno == 30) {
-		addr = &task->thread_info->pcb.usp;
+		addr = &task_thread_info(task)->pcb.usp;
 	} else if (regno == 65) {
-		addr = &task->thread_info->pcb.unique;
+		addr = &task_thread_info(task)->pcb.unique;
 	} else if (regno == 31 || regno > 65) {
 		zero = 0;
 		addr = &zero;
 	} else {
-		addr = (void *)task->thread_info + regoff[regno];
+		addr = task_stack_page(task) + regoff[regno];
 	}
 	return addr;
 }
@@ -125,7 +132,7 @@ get_reg(struct task_struct * task, unsigned long regno)
 	if (regno == 63) {
 		unsigned long fpcr = *get_reg_addr(task, regno);
 		unsigned long swcr
-		  = task->thread_info->ieee_state & IEEE_SW_MASK;
+		  = task_thread_info(task)->ieee_state & IEEE_SW_MASK;
 		swcr = swcr_update_status(swcr, fpcr);
 		return fpcr | swcr;
 	}
@@ -139,8 +146,8 @@ static int
 put_reg(struct task_struct *task, unsigned long regno, unsigned long data)
 {
 	if (regno == 63) {
-		task->thread_info->ieee_state
-		  = ((task->thread_info->ieee_state & ~IEEE_SW_MASK)
+		task_thread_info(task)->ieee_state
+		  = ((task_thread_info(task)->ieee_state & ~IEEE_SW_MASK)
 		     | (data & IEEE_SW_MASK));
 		data = (data & FPCR_DYN_MASK) | ieee_swcr_to_fpcr(data);
 	}
@@ -188,35 +195,35 @@ ptrace_set_bpt(struct task_struct * child)
 		 * branch (emulation can be tricky for fp branches).
 		 */
 		displ = ((s32)(insn << 11)) >> 9;
-		child->thread_info->bpt_addr[nsaved++] = pc + 4;
+		task_thread_info(child)->bpt_addr[nsaved++] = pc + 4;
 		if (displ)		/* guard against unoptimized code */
-			child->thread_info->bpt_addr[nsaved++]
+			task_thread_info(child)->bpt_addr[nsaved++]
 			  = pc + 4 + displ;
 		DBG(DBG_BPT, ("execing branch\n"));
 	} else if (op_code == 0x1a) {
 		reg_b = (insn >> 16) & 0x1f;
-		child->thread_info->bpt_addr[nsaved++] = get_reg(child, reg_b);
+		task_thread_info(child)->bpt_addr[nsaved++] = get_reg(child, reg_b);
 		DBG(DBG_BPT, ("execing jump\n"));
 	} else {
-		child->thread_info->bpt_addr[nsaved++] = pc + 4;
+		task_thread_info(child)->bpt_addr[nsaved++] = pc + 4;
 		DBG(DBG_BPT, ("execing normal insn\n"));
 	}
 
 	/* install breakpoints: */
 	for (i = 0; i < nsaved; ++i) {
-		res = read_int(child, child->thread_info->bpt_addr[i],
+		res = read_int(child, task_thread_info(child)->bpt_addr[i],
 			       (int *) &insn);
 		if (res < 0)
 			return res;
-		child->thread_info->bpt_insn[i] = insn;
+		task_thread_info(child)->bpt_insn[i] = insn;
 		DBG(DBG_BPT, ("    -> next_pc=%lx\n",
-			      child->thread_info->bpt_addr[i]));
-		res = write_int(child, child->thread_info->bpt_addr[i],
+			      task_thread_info(child)->bpt_addr[i]));
+		res = write_int(child, task_thread_info(child)->bpt_addr[i],
 				BREAKINST);
 		if (res < 0)
 			return res;
 	}
-	child->thread_info->bpt_nsaved = nsaved;
+	task_thread_info(child)->bpt_nsaved = nsaved;
 	return 0;
 }
 
@@ -227,9 +234,9 @@ ptrace_set_bpt(struct task_struct * child)
 int
 ptrace_cancel_bpt(struct task_struct * child)
 {
-	int i, nsaved = child->thread_info->bpt_nsaved;
+	int i, nsaved = task_thread_info(child)->bpt_nsaved;
 
-	child->thread_info->bpt_nsaved = 0;
+	task_thread_info(child)->bpt_nsaved = 0;
 
 	if (nsaved > 2) {
 		printk("ptrace_cancel_bpt: bogus nsaved: %d!\n", nsaved);
@@ -237,8 +244,8 @@ ptrace_cancel_bpt(struct task_struct * child)
 	}
 
 	for (i = 0; i < nsaved; ++i) {
-		write_int(child, child->thread_info->bpt_addr[i],
-			  child->thread_info->bpt_insn[i]);
+		write_int(child, task_thread_info(child)->bpt_addr[i],
+			  task_thread_info(child)->bpt_insn[i]);
 	}
 	return (nsaved != 0);
 }
@@ -253,38 +260,12 @@ void ptrace_disable(struct task_struct *child)
 	ptrace_cancel_bpt(child);
 }
 
-asmlinkage long
-do_sys_ptrace(long request, long pid, long addr, long data,
-	      struct pt_regs *regs)
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
-	struct task_struct *child;
 	unsigned long tmp;
 	size_t copied;
 	long ret;
 
-	lock_kernel();
-	DBG(DBG_MEM, ("request=%ld pid=%ld addr=0x%lx data=0x%lx\n",
-		      request, pid, addr, data));
-	if (request == PTRACE_TRACEME) {
-		ret = ptrace_traceme();
-		goto out_notsk;
-	}
-
-	child = ptrace_get_task_struct(pid);
-	if (IS_ERR(child)) {
-		ret = PTR_ERR(child);
-		goto out_notsk;
-	}
-
-	if (request == PTRACE_ATTACH) {
-		ret = ptrace_attach(child);
-		goto out;
-	}
-
-	ret = ptrace_check_attach(child, request == PTRACE_KILL);
-	if (ret < 0)
-		goto out;
-
 	switch (request) {
 	/* When I and D space are separate, these will need to be fixed.  */
 	case PTRACE_PEEKTEXT: /* read word at location addr. */
@@ -294,13 +275,13 @@ do_sys_ptrace(long request, long pid, long addr, long data,
 		if (copied != sizeof(tmp))
 			break;
 		
-		regs->r0 = 0;	/* special return: no errors */
+		force_successful_syscall_return();
 		ret = tmp;
 		break;
 
 	/* Read register number ADDR. */
 	case PTRACE_PEEKUSR:
-		regs->r0 = 0;	/* special return: no errors */
+		force_successful_syscall_return();
 		ret = get_reg(child, addr);
 		DBG(DBG_MEM, ("peek $%ld->%#lx\n", addr, ret));
 		break;
@@ -308,9 +289,7 @@ do_sys_ptrace(long request, long pid, long addr, long data,
 	/* When I and D space are separate, this will have to be fixed.  */
 	case PTRACE_POKETEXT: /* write the word at location addr. */
 	case PTRACE_POKEDATA:
-		tmp = data;
-		copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 1);
-		ret = (copied == sizeof(tmp)) ? 0 : -EIO;
+		ret = generic_ptrace_pokedata(child, addr, data);
 		break;
 
 	case PTRACE_POKEUSR: /* write the specified register */
@@ -348,33 +327,25 @@ do_sys_ptrace(long request, long pid, long addr, long data,
 		/* make sure single-step breakpoint is gone. */
 		ptrace_cancel_bpt(child);
 		wake_up_process(child);
-		goto out;
+		break;
 
 	case PTRACE_SINGLESTEP:  /* execute single instruction. */
 		ret = -EIO;
 		if (!valid_signal(data))
 			break;
 		/* Mark single stepping.  */
-		child->thread_info->bpt_nsaved = -1;
+		task_thread_info(child)->bpt_nsaved = -1;
 		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 		child->exit_code = data;
 		wake_up_process(child);
 		/* give it a chance to run. */
 		ret = 0;
-		goto out;
-
-	case PTRACE_DETACH:	 /* detach a process that was attached. */
-		ret = ptrace_detach(child, data);
-		goto out;
+		break;
 
 	default:
 		ret = ptrace_request(child, request, addr, data);
-		goto out;
+		break;
 	}
- out:
-	put_task_struct(child);
- out_notsk:
-	unlock_kernel();
 	return ret;
 }