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Commit 8c031ba6 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Unbreak bootloader due to gcc-7 optimizations 



gcc-7 optimizes the byte-wise accesses of get_unaligned_le32() into
word-wise accesses if the 32-bit integer output_len is declared as
external. This panics then the bootloader since we don't have the
unaligned access fault trap handler installed during boot time.

Avoid this optimization by declaring output_len as byte-aligned and thus
unbreak the bootloader code.

Additionally, compile the boot code optimized for size.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent af21b01d

arch/parisc/boot/compressed/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -15,7 +15,7 @@ targets += misc.o piggy.o sizes.h head.o real2.o firmware.o 
KBUILD_CFLAGS := -D__KERNEL__ -O2 -DBOOTLOADER

KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING

KBUILD_CFLAGS += $(cflags-y) -fno-delete-null-pointer-checks

KBUILD_CFLAGS += -fno-PIE -mno-space-regs -mdisable-fpregs

KBUILD_CFLAGS += -fno-PIE -mno-space-regs -mdisable-fpregs -Os

ifndef CONFIG_64BIT

KBUILD_CFLAGS += -mfast-indirect-calls

endif

arch/parisc/boot/compressed/misc.c

+2 −1
Original line number Diff line number Diff line
@@ -24,7 +24,8 @@ 
/* Symbols defined by linker scripts */

extern char input_data[];

extern int input_len;

extern __le32 output_len;	/* at unaligned address, little-endian */

/* output_len is inserted by the linker possibly at an unaligned address */

extern __le32 output_len __aligned(1);

extern char _text, _end;

extern char _bss, _ebss;

extern char _startcode_end;