[ppc64] Fix for function descriptors

Marin Cermak has found various testcases (or one of them) of GDB FAIL on
ppc64.

https://sourceware.org/bugzilla/show_bug.cgi?id=20328

.o contained only the function descriptor address.

The DWARF as produced by Tcl Dwarf::assemble:
 <1><27>: Abbrev Number: 4 (DW_TAG_subprogram)
    <28>   DW_AT_name        : main
    <2d>   DW_AT_external    : 1
    <2e>   DW_AT_low_pc      : 0x1001ff98
    <36>   DW_AT_high_pc     : 0x1002ff98
 <2><3e>: Abbrev Number: 5 (DW_TAG_lexical_block)

Runtime info:
$2 = {<text variable, no debug info>} 0x10000674 <.main>
$3 = {void ()} 0x1001ff98 <main>

On Tue, 12 Jul 2016 15:22:49 +0200, Ulrich Weigand wrote:
Well, most of the gdb.dwarf2 test cases simply use explicitly placed labels
for the DW_AT_low_pc / DW_AT_high_pc attributes.

See e.g. dw2-unresolved-main.c:

asm (".globl cu_text_start");
asm ("cu_text_start:");

On Wed, 13 Jul 2016 10:54:00 +0200, Jan Kratochvil wrote:
Now I see I should not do that because:

lib/dwarf.exp:
proc function_range { func src } {

So I am providing this patch.

gdb/testsuite/ChangeLog
2016-07-13  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.dwarf2/atomic-type.exp: Use function_range for low_pc and high_pc.
	* gdb.dwarf2/atomic.c (f): Rename f_end_lbl to f_label.
	* gdb.dwarf2/dw2-bad-mips-linkage-name.c (f): Rename f_end_lbl to
	f_label.
	(g): Rename g_end_lbl to g_label.
	* gdb.dwarf2/dw2-bad-mips-linkage-name.exp: Use function_range for
	low_pc and high_pc.
	* gdb.dwarf2/dw2-lexical-block-bare.exp: Likewise.

6 files changed, 46 insertions, 13 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 851487f..7ab1228 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,14 @@
+2016-07-13  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* gdb.dwarf2/atomic-type.exp: Use function_range for low_pc and high_pc.
+	* gdb.dwarf2/atomic.c (f): Rename f_end_lbl to f_label.
+	* gdb.dwarf2/dw2-bad-mips-linkage-name.c (f): Rename f_end_lbl to
+	f_label.
+	(g): Rename g_end_lbl to g_label.
+	* gdb.dwarf2/dw2-bad-mips-linkage-name.exp: Use function_range for
+	low_pc and high_pc.
+	* gdb.dwarf2/dw2-lexical-block-bare.exp: Likewise.
+
 2016-07-12  Tom Tromey  <tom@tromey.com>
 
 	PR python/19293:
diff --git a/gdb/testsuite/gdb.dwarf2/atomic-type.exp b/gdb/testsuite/gdb.dwarf2/atomic-type.exp
index 7b35cad..0addefe 100644
--- a/gdb/testsuite/gdb.dwarf2/atomic-type.exp
+++ b/gdb/testsuite/gdb.dwarf2/atomic-type.exp
@@ -25,6 +25,12 @@ standard_testfile atomic.c atomic-type-dw.S
 
 set asm_file [standard_output_file $srcfile2]
 Dwarf::assemble $asm_file {
+    global srcdir subdir srcfile
+
+    set f_result [function_range f ${srcdir}/${subdir}/${srcfile}]
+    set f_start [lindex $f_result 0]
+    set f_length [lindex $f_result 1]
+
     cu {} {
 	DW_TAG_compile_unit {
                 {DW_AT_language @DW_LANG_C11}
@@ -68,8 +74,8 @@ Dwarf::assemble $asm_file {
 
             DW_TAG_subprogram {
                 {name f}
-                {low_pc [gdb_target_symbol f] addr}
-                {high_pc f_end_lbl addr}
+                {low_pc $f_start addr}
+                {high_pc "$f_start + $f_length" addr}
                 {type :$i_l}
             } {
                 DW_TAG_formal_parameter {
diff --git a/gdb/testsuite/gdb.dwarf2/atomic.c b/gdb/testsuite/gdb.dwarf2/atomic.c
index 9a2d37b..ecaa56c 100644
--- a/gdb/testsuite/gdb.dwarf2/atomic.c
+++ b/gdb/testsuite/gdb.dwarf2/atomic.c
@@ -28,7 +28,7 @@ main (void)
 int
 f (char *x)
 {
-  asm (".global f_end_lbl\nf_end_lbl:");
+  asm ("f_label: .globl f_label");
   return 0;
 }
 
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.c b/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.c
index eaf1233..5816324 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.c
+++ b/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.c
@@ -28,7 +28,7 @@ main (void)
 int
 f (char *x)
 {
-  asm (".global f_end_lbl\nf_end_lbl:");
+  asm ("f_label: .globl f_label");
   return 0;
 }
 
@@ -36,6 +36,6 @@ f (char *x)
 int
 g (char *x)
 {
-  asm (".global g_end_lbl\ng_end_lbl:");
+  asm ("g_label: .globl g_label");
   return 0;
 }
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.exp b/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.exp
index b1041fa..043c1da 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-bad-mips-linkage-name.exp
@@ -26,6 +26,16 @@ standard_testfile dw2-bad-mips-linkage-name.c dw2-bad-mips-linkage-name.S
 
 set asm_file [standard_output_file $srcfile2]
 Dwarf::assemble $asm_file {
+    global srcdir subdir srcfile
+
+    set f_result [function_range f ${srcdir}/${subdir}/${srcfile}]
+    set f_start [lindex $f_result 0]
+    set f_length [lindex $f_result 1]
+
+    set g_result [function_range g ${srcdir}/${subdir}/${srcfile}]
+    set g_start [lindex $g_result 0]
+    set g_length [lindex $g_result 1]
+
     cu {} {
 	DW_TAG_compile_unit {
                 {DW_AT_language @DW_LANG_C}
@@ -42,15 +52,15 @@ Dwarf::assemble $asm_file {
 	    }
             DW_TAG_subprogram {
                 {name f}
-                {low_pc [gdb_target_symbol f] addr}
-                {high_pc f_end_lbl addr}
+                {low_pc $f_start addr}
+                {high_pc "$f_start + $f_length" addr}
                 {type :$b_l}
 		{DW_AT_MIPS_linkage_name _Z1fv}
 	    }
             DW_TAG_subprogram {
                 {name g}
-                {low_pc [gdb_target_symbol g] addr}
-                {high_pc g_end_lbl addr}
+                {low_pc $g_start addr}
+                {high_pc "$g_start + $g_length" addr}
                 {type :$b_l}
 		{DW_AT_MIPS_linkage_name 42 DW_FORM_data1}
 	    }
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-lexical-block-bare.exp b/gdb/testsuite/gdb.dwarf2/dw2-lexical-block-bare.exp
index 3f9411e..d09f56b 100644
--- a/gdb/testsuite/gdb.dwarf2/dw2-lexical-block-bare.exp
+++ b/gdb/testsuite/gdb.dwarf2/dw2-lexical-block-bare.exp
@@ -24,10 +24,16 @@ standard_testfile .S main.c
 # Make some DWARF for the test.
 set asm_file [standard_output_file $srcfile]
 Dwarf::assemble $asm_file {
+    global srcdir subdir srcfile2
+
+    set main_result [function_range main ${srcdir}/${subdir}/${srcfile2}]
+    set main_start [lindex $main_result 0]
+    set main_length [lindex $main_result 1]
+
     cu {} {
 	compile_unit {
-	    {low_pc [gdb_target_symbol main] DW_FORM_addr}
-	    {high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
+	    {low_pc $main_start addr}
+	    {high_pc "$main_start + $main_length" addr}
 	} {
 	    declare_labels integer_label
 
@@ -40,8 +46,8 @@ Dwarf::assemble $asm_file {
 	    DW_TAG_subprogram {
 		{name main}
 		{DW_AT_external 1 flag}
-		{low_pc [gdb_target_symbol main] DW_FORM_addr}
-		{high_pc [gdb_target_symbol main]+0x10000 DW_FORM_addr}
+		{low_pc $main_start addr}
+		{high_pc "$main_start + $main_length" addr}
 	    } {
 		DW_TAG_lexical_block {
 		} {