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ARM: use r9 for gd

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To be more EABI compliant and as a preparation for building
with clang, use the platform-specific r9 register for gd
instead of r8.

note: The FIQ is not updated since it is not used in u-boot,
and under discussion for the time being.

The following checkpatch warning is ignored:
WARNING: Use of volatile is usually wrong: see
Documentation/volatile-considered-harmful.txt

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
This commit is contained in:
Jeroen Hofstee 2013-09-21 14:04:41 +02:00 committed by Albert ARIBAUD
parent a81872ff27
commit fe1378a961
4 changed files with 12 additions and 12 deletions
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2
arch/arm/config.mk
View file

@ -17,7 +17,7 @@ endif
LDFLAGS_FINAL += --gc-sections
PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \
-fno-common -ffixed-r8 -msoft-float
-fno-common -ffixed-r9 -msoft-float
# Support generic board on ARM
__HAVE_ARCH_GENERIC_BOARD := y

4
arch/arm/cpu/armv7/lowlevel_init.S
View file

@ -22,11 +22,11 @@ ENTRY(lowlevel_init)
ldr sp, =CONFIG_SYS_INIT_SP_ADDR
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
#ifdef CONFIG_SPL_BUILD
ldr r8, =gdata
ldr r9, =gdata
#else
sub sp, #GD_SIZE
bic sp, sp, #7
mov r8, sp
mov r9, sp
#endif
/*
* Save the old lr(passed in ip) and the current lr to stack

2
arch/arm/include/asm/global_data.h
View file

@ -47,6 +47,6 @@ struct arch_global_data {
#include <asm-generic/global_data.h>
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r8")
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r9")
#endif /* __ASM_GBL_DATA_H */

16
arch/arm/lib/crt0.S
View file

@ -69,7 +69,7 @@ ENTRY(_main)
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
sub sp, #GD_SIZE /* allocate one GD above SP */
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
mov r8, sp /* GD is above SP */
mov r9, sp /* GD is above SP */
mov r0, #0
bl board_init_f
@ -81,15 +81,15 @@ ENTRY(_main)
* 'here' but relocated.
*/
ldr sp, [r8, #GD_START_ADDR_SP] /* sp = gd->start_addr_sp */
ldr sp, [r9, #GD_START_ADDR_SP] /* sp = gd->start_addr_sp */
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
ldr r8, [r8, #GD_BD] /* r8 = gd->bd */
sub r8, r8, #GD_SIZE /* new GD is below bd */
ldr r9, [r9, #GD_BD] /* r9 = gd->bd */
sub r9, r9, #GD_SIZE /* new GD is below bd */
adr lr, here
ldr r0, [r8, #GD_RELOC_OFF] /* r0 = gd->reloc_off */
ldr r0, [r9, #GD_RELOC_OFF] /* r0 = gd->reloc_off */
add lr, lr, r0
ldr r0, [r8, #GD_RELOCADDR] /* r0 = gd->relocaddr */
ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
b relocate_code
here:
@ -111,8 +111,8 @@ clbss_l:cmp r0, r1 /* while not at end of BSS */
bl red_led_on
/* call board_init_r(gd_t *id, ulong dest_addr) */
mov r0, r8 /* gd_t */
ldr r1, [r8, #GD_RELOCADDR] /* dest_addr */
mov r0, r9 /* gd_t */
ldr r1, [r9, #GD_RELOCADDR] /* dest_addr */
/* call board_init_r */
ldr pc, =board_init_r /* this is auto-relocated! */