Make the loader a little less verbose.

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

index 54c5bd95fbdb4104b6b5d11e917f4fc11b42c368..2a63b4d7c777a7b95505571b4f05bf102f95765f 100644 (file)
--- a/net/http/fs.c
+++ b/net/http/fs.c
@@ -34,37 +34,102 @@
  #include "fsdata.h"
  #include "fsdata.c"
  #include <io.h>
+#include <minilib.h>
+#include <paging.h>
+#include <demap.h>
+#include <output.h>
+#include <state.h>
+
+static char http_output_buffer[1280];
  
  /*-----------------------------------------------------------------------------------*/
  
  void handle_regs(struct fs_file *file)
  {
-  static unsigned char buf[2048];
+  int i;
+  int len;
+
+  len = snprintf(http_output_buffer, sizeof(http_output_buffer), "<html><pre>");
+
+  for (i = 0; i < state_num_regs(); i++) {
+    len += state_dump_reg(http_output_buffer + len, sizeof(http_output_buffer) - len, i);
+  }
+
+  file->len = len;
+  file->data = http_output_buffer;
+}
+
+#define LEFT (sizeof(http_output_buffer) - len)
+
+void handle_backtrace(struct fs_file *file)
+{
+  int i = 10;
+  int len;
+  void *pebp, *peip;
+  uint64_t bp, next;
+
+  int longmode = (get_operating_mode() == LONG_64BIT);
+
+  char * buf = http_output_buffer;
+  
+  strcpy(buf, "<html><head><title>Backtrace</title></head><body><tt><pre>");
+  len = strlen(buf);
+
+  bp = state_get_reg(longmode ? STATE_REG_RIP : STATE_REG_EIP);
+
+  if (longmode)
+    len += snprintf(buf + len, LEFT, "0x%08x%08x, from\n", (uint32_t)(bp >> 32), (uint32_t)bp);
+  else
+    len += snprintf(buf + len, LEFT, "0x%08x, from\n", (uint32_t)bp);
+  
+  bp = state_get_reg(longmode ? STATE_REG_RBP : STATE_REG_EBP);
    
-  sprintf(buf,
-    "<html><head><title>Registers</title></head><body>"
-    "<p>At the time you requested this page, the system's registers were:</p>"
-    "<tt><pre>"
-    "%%eax: 0x%08x    %%ebx: 0x%08x    %%ecx: 0x%08x    %%edx: 0x%08x\n"
-    "%%ebp: 0x%08x    %%esi: 0x%08x    %%edi: 0x%08x    %%esp: 0x%08x\n"
-    "%%cr0: 0x%08x    %%cr3: 0x%08x    %%eip: 0x%08x    %%eflags: 0x%08x\n"
-    "</pre></tt></body></html>",
-    *(unsigned long*)0xAFFD0,
-    *(unsigned long*)0xAFFDC,
-    *(unsigned long*)0xAFFD4,
-    *(unsigned long*)0xAFFD8,
-    *(unsigned long*)0xAFFE4,
-    *(unsigned long*)0xAFFE8,
-    *(unsigned long*)0xAFFEC,
-    *(unsigned long*)0xAFFE0,
-    *(unsigned long*)0xAFFFC,
-    *(unsigned long*)0xAFFF8,
-    *(unsigned long*)0xAFFF0,
-    *(unsigned long*)0xAFFF4);
-    
+
+  outputf("Backtrace:");
+  while ((peip = demap(bp+(longmode?8:4))) != 0x0 && i--)
+  {
+    if (longmode) {
+      uint64_t rip;
+      rip = *(uint64_t *)peip;
+      len += snprintf(buf + len, LEFT, "0x%08x%08x, from\n", (uint32_t)(rip >> 32), (uint32_t)rip);
+    } else {
+      len += snprintf(buf + len, LEFT, "0x%08x, from\n", *(uint32_t *)peip);
+    }
+    outputf("   EIP: %08x", *(uint32_t *)peip);
+
+    pebp = demap(bp);
+    if (!pebp || (bp & 3))
+    {
+      len += snprintf(buf + len, LEFT, "&lt;unreadable frame&gt;\n");
+      break;
+    }
+    outputf("   *EBP: %08x", *(uint32_t *)pebp);
+
+    if (longmode)
+      next = *(uint64_t *)pebp;
+    else
+      next = *(uint32_t *)pebp;
+
+    if (bp >= next && next)
+    {
+      len += snprintf(buf + len, LEFT, "&lt;recursive frame&gt;\n");
+      break;
+    }
+
+    bp = next;
+  }
+
+  if (i == -1)
+    len += snprintf(buf + len, LEFT, "...\n");
+  else if (bp && !peip)
+    len += snprintf(buf + len, LEFT, "&lt;unreadable fp @ %08x&gt;\n", (uint32_t) bp);
+  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 +152,11 @@ 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);