patch-2.4.18 linux/arch/s390/kernel/process.c

• Lines: 203
• Date: Fri Dec 21 16:25:30 2001
• Orig file: linux.orig/arch/s390/kernel/process.c
• Orig date: Mon Feb 18 20:18:39 2002

diff -Naur -X /home/marcelo/lib/dontdiff linux.orig/arch/s390/kernel/process.c linux/arch/s390/kernel/process.c
@@ -75,173 +75,24 @@
 	}
 }
 
-/*
-  As all the register will only be made displayable to the root
-  user ( via printk ) or checking if the uid of the user is 0 from
-  the /proc filesystem please god this will be secure enough DJB.
-  The lines are given one at a time so as not to chew stack space in
-  printk on a crash & also for the proc filesystem when you get
-  0 returned you know you've got all the lines
- */
-
-static int sprintf_regs(int line, char *buff, struct task_struct *task, struct pt_regs *regs)
-{
-	int linelen=0;
-	int regno,chaincnt;
-	u32 backchain,prev_backchain,endchain;
-	u32 ksp = 0;
-	char *mode = "???";
-
-	enum
-	{
-		sp_linefeed,
-		sp_psw,
-		sp_ksp,
-		sp_gprs,
-		sp_gprs1,
-		sp_gprs2,
-		sp_gprs3,
-		sp_gprs4,
-		sp_acrs,
-		sp_acrs1,
-		sp_acrs2,
-		sp_acrs3,
-		sp_acrs4,
-		sp_kern_backchain,
-		sp_kern_backchain1
-	};
-
-	if (task)
-		ksp = task->thread.ksp;
-	if (regs && !(regs->psw.mask & PSW_PROBLEM_STATE))
-		ksp = regs->gprs[15];
-
-	if (regs)
-		mode = (regs->psw.mask & PSW_PROBLEM_STATE)?
-		       "User" : "Kernel";
-
-	switch(line)
-	{
-	case sp_linefeed: 
-		linelen=sprintf(buff,"\n");
-		break;
-	case sp_psw:
-		if(regs)
-			linelen=sprintf(buff, "%s PSW:    %08lx %08lx    %s\n", mode,
-				(unsigned long) regs->psw.mask,
-				(unsigned long) regs->psw.addr,
-				print_tainted());
-		else
-			linelen=sprintf(buff,"pt_regs=NULL some info unavailable\n");
-		break;
-	case sp_ksp:
-		linelen=sprintf(&buff[linelen],
-				"task: %08x ksp: %08x pt_regs: %08x\n",
-				(addr_t)task, (addr_t)ksp, (addr_t)regs);
-		break;
-	case sp_gprs:
-		if(regs)
-			linelen=sprintf(buff, "%s GPRS:\n", mode);
-		break;
-	case sp_gprs1 ... sp_gprs4:
-		if(regs)
-		{
-			regno=(line-sp_gprs1)*4;
-			linelen=sprintf(buff,"%08x  %08x  %08x  %08x\n",
-					regs->gprs[regno], 
-					regs->gprs[regno+1],
-					regs->gprs[regno+2],
-					regs->gprs[regno+3]);
-		}
-		break;
-	case sp_acrs:
-		if(regs)
-			linelen=sprintf(buff, "%s ACRS:\n", mode);
-		break;	
-        case sp_acrs1 ... sp_acrs4:
-		if(regs)
-		{
-			regno=(line-sp_acrs1)*4;
-			linelen=sprintf(buff,"%08x  %08x  %08x  %08x\n",
-					regs->acrs[regno],
-					regs->acrs[regno+1],
-					regs->acrs[regno+2],
-					regs->acrs[regno+3]);
-		}
-		break;
-	case sp_kern_backchain:
-		if (regs && (regs->psw.mask & PSW_PROBLEM_STATE))
-			break;	
-		if (ksp)
-			linelen=sprintf(buff, "Kernel BackChain  CallChain\n");
-		break;
-	default:
-		if (ksp)
-		{
-			
-			backchain=ksp&PSW_ADDR_MASK;
-			endchain=((backchain&(-8192))+8192);
-			prev_backchain=backchain-1;
-			line-=sp_kern_backchain1;
-			for(chaincnt=0;;chaincnt++)
-			{
-				if((backchain==0)||(backchain>=endchain)
-				   ||(chaincnt>=8)||(prev_backchain>=backchain))
-					break;
-				if(chaincnt==line)
-				{
-					linelen+=sprintf(&buff[linelen],"       %08x   [<%08lx>]\n",
-							 backchain,
-							 *(u32 *)(backchain+56)&PSW_ADDR_MASK);
-					break;
-				}
-				prev_backchain=backchain;
-				backchain=(*((u32 *)backchain))&PSW_ADDR_MASK;
-			}
-		}
-	}
-	return(linelen);
-}
-
+extern void show_registers(struct pt_regs *regs);
+extern void show_trace(unsigned long *sp);
 
 void show_regs(struct pt_regs *regs)
 {
-	char buff[80];
-	int i, line;
+	struct task_struct *tsk = current;
 
-        printk("CPU:    %d\n",smp_processor_id());
-        printk("Process %s (pid: %d, stackpage=%08X)\n",
-                current->comm, current->pid, 4096+(addr_t)current);
-	
-	for (line = 0; sprintf_regs(line, buff, current, regs); line++)
-		printk(buff);
-
-	if (regs->psw.mask & PSW_PROBLEM_STATE)
-	{
-		printk("User Code:\n");
-		memset(buff, 0, 20);
-		copy_from_user(buff,
-			       (char *) (regs->psw.addr & PSW_ADDR_MASK), 20);
-		for (i = 0; i < 20; i++)
-			printk("%02x ", buff[i]);
-		printk("\n");
-	}
+        printk("CPU:    %d    %s\n", tsk->processor, print_tainted());
+        printk("Process %s (pid: %d, task: %08lx, ksp: %08x)\n",
+	       current->comm, current->pid, (unsigned long) tsk,
+	       tsk->thread.ksp);
+
+	show_registers(regs);
+	/* Show stack backtrace if pt_regs is from kernel mode */
+	if (!(regs->psw.mask & PSW_PROBLEM_STATE))
+		show_trace((unsigned long *) regs->gprs[15]);
 }
 
-char *task_show_regs(struct task_struct *task, char *buffer)
-{
-	int line, len;
-
-	for (line = 0; ; line++)
-	{
-		len = sprintf_regs(line, buffer, task, task->thread.regs);
-		if (!len) break;
-		buffer += len;
-	}
-	return buffer;
-}
-
-
 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 {
         int clone_arg = flags | CLONE_VM;
@@ -301,16 +152,10 @@
             unsigned long gprs[10];    /* gprs 6 -15                       */
             unsigned long fprs[4];     /* fpr 4 and 6                      */
             unsigned long empty[4];
-#if CONFIG_REMOTE_DEBUG
-	    struct gdb_pt_regs childregs;
-#else
             struct pt_regs childregs;
-#endif
           } *frame;
 
         frame = (struct stack_frame *) (2*PAGE_SIZE + (unsigned long) p) -1;
-        frame = (struct stack_frame *) (((unsigned long) frame)&-8L);
-        p->thread.regs = (struct pt_regs *)&frame->childregs;
         p->thread.ksp = (unsigned long) frame;
         memcpy(&frame->childregs,regs,sizeof(struct pt_regs));
         frame->childregs.gprs[15] = new_stackp;