[PATCH] gdb: Add malloc and free symbols to kernel.exec to improve gdb functionality

[Glenn Washburn <development@efficientek.com>]

Add linker flags when linking kernel.exec to have malloc and free point to
grub_malloc and grub_free respectively. Some gdb functionality depends on
gdb locating the symbols "malloc" and "free", such as dynamically creating
strings for arguments to injected function calls. A trivial example would
the gdb command 'p strlen("astring")'.

Signed-off-by: Glenn Washburn <development@efficientek.com>
---
This should have been included in the gdb patch series I recently sent,
although its not required by nor requires any of those patches.

Glenn

---
 conf/Makefile.common | 1 +
 1 file changed, 1 insertion(+)

diff --git a/conf/Makefile.common b/conf/Makefile.common
index f0bb6e160a..069b428c1a 100644
--- a/conf/Makefile.common
+++ b/conf/Makefile.common
@@ -36,6 +36,7 @@ BUILD_CPPFLAGS += $(CPPFLAGS_DEFAULT)
 
 CFLAGS_KERNEL = $(CFLAGS_PLATFORM) -ffreestanding
 LDFLAGS_KERNEL = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC)
+LDFLAGS_KERNEL += -Wl,--defsym=malloc=grub_malloc -Wl,--defsym=free=grub_free
 CPPFLAGS_KERNEL = $(CPPFLAGS_CPU) $(CPPFLAGS_PLATFORM) -DGRUB_KERNEL=1
 CCASFLAGS_KERNEL = $(CCASFLAGS_CPU) $(CCASFLAGS_PLATFORM)
 STRIPFLAGS_KERNEL = -R .rel.dyn -R .reginfo -R .note -R .comment -R .drectve -R .note.gnu.gold-version -R .MIPS.abiflags -R .ARM.exidx
-- 
2.27.0