vserver 2.0 rc7

[linux-2.6.git] / arch / sh64 / lib / dbg.c

diff --git a/arch/sh64/lib/dbg.c b/arch/sh64/lib/dbg.c
index d74913f..526feda 100644 (file)
--- a/arch/sh64/lib/dbg.c
+++ b/arch/sh64/lib/dbg.c
@@ -8,6 +8,7 @@
 -- Copyright 2004 Richard Curnow (evt_debug etc)
 --
 --------------------------------------------------------------------------*/
+#include <linux/config.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
@@ -136,6 +137,8 @@ void print_itlb(void)
 
 /* ======================================================================= */
 
+#ifdef CONFIG_POOR_MANS_STRACE
+
 #include "syscalltab.h"
 
 struct ring_node {
@@ -151,6 +154,17 @@ struct ring_node {
 static struct ring_node event_ring[16];
 static int event_ptr = 0;
 
+struct stored_syscall_data {
+       int pid;
+       int syscall_number;
+};
+
+#define N_STORED_SYSCALLS 16
+
+static struct stored_syscall_data stored_syscalls[N_STORED_SYSCALLS];
+static int syscall_next=0;
+static int syscall_next_print=0;
+
 void evt_debug(int evt, int ret_addr, int event, int tra, struct pt_regs *regs)
 {
        int syscallno = tra & 0xff;
@@ -187,15 +201,35 @@ void evt_debug(int evt, int ret_addr, int event, int tra, struct pt_regs *regs)
        event_ptr = (event_ptr + 1) & 15;
 
        if ((event == 2) && (evt == 0x160)) {
-               if (syscallno < NUM_SYSCALL_INFO_ENTRIES)
-                       printk("Task %d: %s()\n",
-                              current->pid,
-                              syscall_info_table[syscallno].name);
+               if (syscallno < NUM_SYSCALL_INFO_ENTRIES) {
+                       /* Store the syscall information to print later.  We
+                        * can't print this now - currently we're running with
+                        * SR.BL=1, so we can't take a tlbmiss (which could occur
+                        * in the console drivers under printk).
+                        *
+                        * Just overwrite old entries on ring overflow - this
+                        * is only for last-hope debugging. */
+                       stored_syscalls[syscall_next].pid = current->pid;
+                       stored_syscalls[syscall_next].syscall_number = syscallno;
+                       syscall_next++;
+                       syscall_next &= (N_STORED_SYSCALLS - 1);
+               }
+       }
+}
+
+static void drain_syscalls(void) {
+       while (syscall_next_print != syscall_next) {
+               printk("Task %d: %s()\n",
+                       stored_syscalls[syscall_next_print].pid,
+                       syscall_info_table[stored_syscalls[syscall_next_print].syscall_number].name);
+                       syscall_next_print++;
+                       syscall_next_print &= (N_STORED_SYSCALLS - 1);
        }
 }
 
 void evt_debug2(unsigned int ret)
 {
+       drain_syscalls();
        printk("Task %d: syscall returns %08x\n", current->pid, ret);
 }
 
@@ -231,6 +265,8 @@ void evt_debug_ret_from_exc(struct pt_regs *regs)
        event_ptr = (event_ptr + 1) & 15;
 }
 
+#endif /* CONFIG_POOR_MANS_STRACE */
+
 /* ======================================================================= */
 
 void show_excp_regs(char *from, int trapnr, int signr, struct pt_regs *regs)