[RFA 7/8] New port: TI C6x: test case fixes

[Yao Qi <yao at codesourcery dot com>]

Two changes in this patch are related to c6x, while the other two are
not related to c6x very much, which are about uclinx on NON-MMU machine.

Both gdb.base/savedregs.exp and gdb.mi/mi-syn-frame.exp expects to get
an exception when access memory of address 0x0.  It doesn't work on
NON-MMU machine.

Actually, this has been discussed in this thread,

  http://sourceware.org/ml/gdb-patches/2011-06/msg00124.html
  [patch, testsuite] gdb.base/savedregs.exp: SIGSEGV -> SIGILL

The final conclusion is that we use SIGILL for NON-MMU machine, and
continue to use SIGSEGV for MMU machine.  Changes in this patch is
implemented in this way.

-- 
Yao (éå)

        gdb/testsuite/
        * gdb.base/maint.exp: set data_section to ".neardata".
        * gdb.base/savedregs.c (thrower): Trigger SIGILL on NO-MMU machine.
        * gdb.base/savedregs.exp: Handle SIGILL.
        (process_saved_regs): Don't check saved register on tic6x-*-*
        * gdb.mi/mi-syn-frame.c (bar): Trigger SIGILL on NO-MMU machine.
---
 gdb/testsuite/gdb.base/maint.exp     |    4 ++++
 gdb/testsuite/gdb.base/savedregs.c   |   22 ++++++++++++++++++++++
 gdb/testsuite/gdb.base/savedregs.exp |    9 +++++++++
 gdb/testsuite/gdb.mi/mi-syn-frame.c  |   21 ++++++++++++++++++++-
 4 files changed, 55 insertions(+), 1 deletions(-)

diff --git a/gdb/testsuite/gdb.base/maint.exp b/gdb/testsuite/gdb.base/maint.exp
index 61ad439..9ef84af 100644
--- a/gdb/testsuite/gdb.base/maint.exp
+++ b/gdb/testsuite/gdb.base/maint.exp
@@ -394,6 +394,10 @@ gdb_test_multiple "maint info sections" "maint info sections" {
 	set data_section ER_RW
 	pass "maint info sections"
     }
+    -re "Exec file:\r\n.*break($EXEEXT)?., file type.*neardata.*$gdb_prompt $" {
+	# c6x doesn't have .data section.  It has .neardata and .fardata section.
+	set data_section ".neardata"
+    }
     -re "Exec file:\r\n.*break($EXEEXT)?., file type.*$gdb_prompt $" {
 	pass "maint info sections"
     }
diff --git a/gdb/testsuite/gdb.base/savedregs.c b/gdb/testsuite/gdb.base/savedregs.c
index 9f302a0..582afc4 100644
--- a/gdb/testsuite/gdb.base/savedregs.c
+++ b/gdb/testsuite/gdb.base/savedregs.c
@@ -22,6 +22,12 @@
 #include <signal.h>
 #include <sys/time.h>
 
+#ifdef __UCLIBC__
+#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
+#define HAS_NOMMU
+#endif
+#endif
+
 static volatile int done;
 
 extern int
@@ -45,11 +51,27 @@ catcher (int sig)
 static void
 thrower (void)
 {
+#if defined(HAS_NOMMU)
+#if defined(__arm__)
+  asm(".word 0xf8f00000");
+#elif defined(__TMS320C6X__)
+  /* 0x56454314 is also an invalid insn but it causes SIGTRAP in kernel.  */
+  asm(".word 0x56454313");
+#else
+#error Please write an invalid instruction here for your target
+#endif
+#else /* defined(HAS_NOMMU) */
   *(char *)0 = 0;
+#endif /* defined(HAS_NOMMU) */
 }
 
 main ()
 {
+#if defined(HAS_NOMMU)
+  signal (SIGILL, catcher);
+#else
   signal (SIGSEGV, catcher);
+#endif
+
   thrower ();
 }
diff --git a/gdb/testsuite/gdb.base/savedregs.exp b/gdb/testsuite/gdb.base/savedregs.exp
index eeee0ff..4408137 100644
--- a/gdb/testsuite/gdb.base/savedregs.exp
+++ b/gdb/testsuite/gdb.base/savedregs.exp
@@ -84,6 +84,14 @@ proc process_saved_regs { current inner outer } {
 		# Sigtramp frames don't yet print <signal trampoline>.
 		set pat "Stack frame at .* Saved registers:.*"
 	    }
+	    thrower {
+		if { [istarget tic6x-*-*] } {
+		    # On tic6x, there is no register saved in function thrower.
+		    set pat "Stack frame at .* in $func .*"
+		} else {
+		    set pat "Stack frame at .* in $func .* Saved registers:.*"
+		}
+	    }
 	    default {
 		set pat "Stack frame at .* in $func .* Saved registers:.*"
 	    }
@@ -143,6 +151,7 @@ process_saved_regs thrower { main } { }
 # Continue to the signal catcher, check main's saved-reg info, capture
 # catcher's saved-reg info.
 gdb_test "handle SIGSEGV pass print nostop"
+gdb_test "handle SIGILL pass print nostop"
 gdb_test "advance catcher" "catcher .* at .*"
 process_saved_regs catcher { sigtramp thrower } { main }
 
diff --git a/gdb/testsuite/gdb.mi/mi-syn-frame.c b/gdb/testsuite/gdb.mi/mi-syn-frame.c
index ddfc08e..cffc5e0 100644
--- a/gdb/testsuite/gdb.mi/mi-syn-frame.c
+++ b/gdb/testsuite/gdb.mi/mi-syn-frame.c
@@ -2,6 +2,12 @@
 #include <unistd.h>
 #include <stdlib.h>
 
+#ifdef __UCLIBC__
+#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
+#define HAS_NOMMU
+#endif
+#endif
+
 void foo (void);
 void bar (void);
 
@@ -25,9 +31,22 @@ foo (void)
 void 
 bar (void)
 {
-  char *nuller = 0;
+#if defined(HAS_NOMMU)
+
+#if defined(__arm__)
+  asm(".word 0xf8f00000");
+#elif defined(__TMS320C6X__)
+  /* 0x56454314 is also an invalid insn but it causes SIGTRAP in kernel.  */
+  asm(".word 0x56454313");
+#else
+#error Please write an invalid instruction here for your target
+#endif
 
+#else /* defined(HAS_NOMMU) */
+  char *nuller = 0;
   *nuller = 'a';      /* try to cause a segfault */
+#endif
+
 }
 
 void
-- 
1.7.0.4