linux/arch/arm/boot/compressed/debug.S
Nicolas Pitre 2752367979 ARM: 7737/1: fix kernel decompressor compilation error with CONFIG_DEBUG_SEMIHOSTING
Selecting this option produces:

  AS      arch/arm/boot/compressed/debug.o
arch/arm/boot/compressed/debug.S:4:33: fatal error: mach/debug-macro.S: No such file or directory
compilation terminated.
make[3]: *** [arch/arm/boot/compressed/debug.o] Error 1

The semihosting support cannot be modelled into a senduart macro as
it requires memory space for argument passing.  So the
CONFIG_DEBUG_LL_INCLUDE may not have any sensible value and the include
directive should be omitted.

While at it, let's add proper semihosting output support to the
decompressor.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-06-05 23:32:24 +01:00

41 lines
635 B
ArmAsm

#include <linux/linkage.h>
#include <asm/assembler.h>
#ifndef CONFIG_DEBUG_SEMIHOSTING
#include CONFIG_DEBUG_LL_INCLUDE
ENTRY(putc)
addruart r1, r2, r3
waituart r3, r1
senduart r0, r1
busyuart r3, r1
mov pc, lr
ENDPROC(putc)
#else
ENTRY(putc)
adr r1, 1f
ldmia r1, {r2, r3}
add r2, r2, r1
ldr r1, [r2, r3]
strb r0, [r1]
mov r0, #0x03 @ SYS_WRITEC
ARM( svc #0x123456 )
THUMB( svc #0xab )
mov pc, lr
.align 2
1: .word _GLOBAL_OFFSET_TABLE_ - .
.word semi_writec_buf(GOT)
ENDPROC(putc)
.bss
.global semi_writec_buf
.type semi_writec_buf, %object
semi_writec_buf:
.space 4
.size semi_writec_buf, 4
#endif