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

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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")'. Make sure not to do this on emu
platforms, or an infinite loop occurs because emu has a special
grub_malloc() that calls malloc().

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Glenn Washburn 2022-03-18 01:34:05 -05:00 committed by Daniel Kiper
parent 6653343881
commit b0da8d3d35
1 changed files with 7 additions and 0 deletions
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7
conf/Makefile.common
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@ -39,6 +39,13 @@ LDFLAGS_KERNEL = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC)
CPPFLAGS_KERNEL = $(CPPFLAGS_CPU) $(CPPFLAGS_PLATFORM) -DGRUB_KERNEL=1 CPPFLAGS_KERNEL = $(CPPFLAGS_CPU) $(CPPFLAGS_PLATFORM) -DGRUB_KERNEL=1
CCASFLAGS_KERNEL = $(CCASFLAGS_CPU) $(CCASFLAGS_PLATFORM) 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 STRIPFLAGS_KERNEL = -R .rel.dyn -R .reginfo -R .note -R .comment -R .drectve -R .note.gnu.gold-version -R .MIPS.abiflags -R .ARM.exidx
if !COND_emu
if COND_HAVE_ASM_USCORE
LDFLAGS_KERNEL += -Wl,--defsym=_malloc=_grub_malloc -Wl,--defsym=_free=_grub_free
else
LDFLAGS_KERNEL += -Wl,--defsym=malloc=grub_malloc -Wl,--defsym=free=grub_free
endif
endif
CFLAGS_MODULE = $(CFLAGS_PLATFORM) -ffreestanding CFLAGS_MODULE = $(CFLAGS_PLATFORM) -ffreestanding
LDFLAGS_MODULE = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC) -Wl,-r LDFLAGS_MODULE = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC) -Wl,-r