Apply patches from jdpotter@google.com, as submitted to NetWatch Maintainer Team...

[netwatch.git] / net / http / fs.c
diff --git a/net/http/fs.c b/net/http/fs.c

index 54c5bd95fbdb4104b6b5d11e917f4fc11b42c368..4fe2c41100c27ec94b60f8665bcb3e5e687d5cab 100644 (file)
--- a/net/http/fs.c
+++ b/net/http/fs.c
@@ -34,14 +34,17 @@
  #include "fsdata.h"
  #include "fsdata.c"
  #include <io.h>
+#include <minilib.h>
+#include <paging.h>
+#include <output.h>
+
+static char http_output_buffer[1024];
  
  /*-----------------------------------------------------------------------------------*/
  
  void handle_regs(struct fs_file *file)
  {
-  static unsigned char buf[2048];
-  
-  sprintf(buf,
+  file->len = snprintf(http_output_buffer, sizeof(http_output_buffer),
      "<html><head><title>Registers</title></head><body>"
      "<p>At the time you requested this page, the system's registers were:</p>"
      "<tt><pre>"
@@ -61,10 +64,57 @@ void handle_regs(struct fs_file *file)
      *(unsigned long*)0xAFFF8,
      *(unsigned long*)0xAFFF0,
      *(unsigned long*)0xAFFF4);
-    
+  
+  file->data = http_output_buffer;
+}
+
+#define LEFT (sizeof(http_output_buffer) - len)
+
+void handle_backtrace(struct fs_file *file)
+{
+  int i = 10;
+  int len;
+  unsigned long *pebp, *peip;
+  unsigned long ebp;
+  unsigned long cr3;
+
+  char * buf = http_output_buffer;
+  
+  strcpy(buf, "<html><head><title>Backtrace</title></head><body><tt><pre>");
+  len = strlen(buf);
+  ebp = *(unsigned long *)0xAFFE4;
+  cr3 = *(unsigned long *)0xAFFF8;
+  
+  len += snprintf(buf + len, LEFT, "0x%08x, from\n", *(unsigned long*)0xAFFF0);
+  
+  /* I never thought I'd do this again. */
+  while ((peip = demap(cr3, ebp+4)) != 0x0 && i--)
+  {
+    len += snprintf(buf + len, LEFT, "0x%08x, from\n", *peip);
+
+    pebp = demap(cr3, ebp);
+    if (!pebp)
+    {
+      len += snprintf(buf + len, LEFT, "&lt;unreadable %ebp&gt;\n");
+      break;
+    }
+    if (ebp >= *pebp && *pebp)
+    {
+      len += snprintf(buf + len, LEFT, "&lt;recursive %ebp&gt;\n");
+      break;
+    }
+    ebp = *pebp;
+  }
+
+  if (i == -1)
+    len += snprintf(buf + len, LEFT, "...\n");
+  else
+    len += snprintf(buf + len, LEFT, "&lt;root&gt;");
+
+  len += snprintf(buf + len, LEFT, "</pre></tt></body></html>");
    
    file->data = buf;
-  file->len = strlen(buf)-1;
+  file->len = len;
  }
  
  void handle_reboot(struct fs_file *file)
@@ -87,6 +137,11 @@ fs_open(const char *name, struct fs_file *file)
      handle_regs(file);
      return 1;
    }
+  if (!strcmp(name, "/backtrace.html"))
+  {
+    handle_backtrace(file);
+    return 1;
+  }
    if (!strcmp(name, "/reboot"))
    {
      handle_reboot(file);