[RFA] New test for i386 prologue scan

[Jerome Guitton <guitton@act-europe.fr>]

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Related to this patch (not approved yet):

http://sources.redhat.com/ml/gdb-patches/2004-04/msg00432.html

Tested on i686-linux. OK to apply?

-- 
Jerome

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2004-04-27  Jerome Guitton  <guitton@gnat.com>

	* i386-prologue.exp: Add testcase for jump instruction as first
	instruction of the real code.
	* i386-prologue.c (jump_at_beginning): New function.

Index: gdb.arch/i386-prologue.c
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.arch/i386-prologue.c,v
retrieving revision 1.2
diff -u -p -r1.2 i386-prologue.c
--- gdb.arch/i386-prologue.c	17 Aug 2003 23:18:31 -0000	1.2
+++ gdb.arch/i386-prologue.c	27 Apr 2004 17:57:23 -0000
@@ -1,11 +1,13 @@
 void gdb1253 (void);
 void gdb1338 (void);
+void jump_at_beginning (void);
 
 int
 main (void)
 {
   gdb1253 ();
   gdb1338 ();
+  jump_at_beginning ();
   return 0;
 }
 
@@ -34,4 +36,20 @@ asm(".text\n"
     "    popl  %ebx\n"
     "    popl  %esi\n"
     "    popl  %edi\n"
+    "    ret\n");
+
+/* The purpose of this function is to verify that, during prologue
+   skip, GDB does not follow a jump at the beginnning of the "real"
+   code.  */
+
+asm(".text\n"
+    "    .align 8\n"
+    "jump_at_beginning:\n"
+    "    push   %ebp\n"
+    "    mov    %esp,%ebp\n"
+    "    jmp    .gdbjump\n"
+    "    nop\n"
+    ".gdbjump:\n"
+    "    movl %ebp,%esp\n"
+    "    popl %ebp\n"
     "    ret\n");
Index: gdb.arch/i386-prologue.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.arch/i386-prologue.exp,v
retrieving revision 1.3
diff -u -p -r1.3 i386-prologue.exp
--- gdb.arch/i386-prologue.exp	7 Sep 2003 16:38:00 -0000	1.3
+++ gdb.arch/i386-prologue.exp	27 Apr 2004 17:57:23 -0000
@@ -76,3 +76,16 @@ gdb_test "backtrace 10" \
 gdb_test "info frame" \
 	".*Saved registers:.*ebx at.*esi at.*edi at.*eip at.*" \
 	"saved registers in gdb1338"
+
+# Testcase jump_at_beginning.
+gdb_test_multiple "break jump_at_beginning" \
+                  "set breakpoint in jump_at_beginning" {
+    -re "Breakpoint \[0-9\]* at ($hex).*$gdb_prompt $" {
+        gdb_test "x/i $expect_out(1,string)" \
+                 ".*<jump_at_beginning.*>:.*jmp.*" \
+                 "check jump_at_beginning prologue end"
+    }
+    default {
+        fail "set breakpoint in jump_at_beginning"
+    }
+}