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PPC: Use r2 instead of r29 as global data pointer

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R29 was an unlucky choice as with recent toolchains (gcc-4.2.x) gcc
will refuse to use load/store multiple insns; instead, it issues a
list of simple load/store instructions upon function entry and exit,
resulting in bigger code size, which in turn makes the build for a
few boards fail.

Use r2 instead.

Signed-off-by: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Wolfgang Denk 2008-02-14 22:43:22 +01:00
parent 3c234efa69
commit e7670f6c1e
19 changed files with 24 additions and 23 deletions
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4
README
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@ -3499,7 +3499,7 @@ GCC's implementation.
For PowerPC, the following registers have specific use:
R1: stack pointer
R2: TOC pointer
R2: reserved for system use
R3-R4: parameter passing and return values
R5-R10: parameter passing
R13: small data area pointer
@ -3508,7 +3508,7 @@ For PowerPC, the following registers have specific use:
(U-Boot also uses R14 as internal GOT pointer.)
==> U-Boot will use R29 to hold a pointer to the global data
==> U-Boot will use R2 to hold a pointer to the global data
Note: on PPC, we could use a static initializer (since the
address of the global data structure is known at compile time),

2
cpu/74xx_7xx/config.mk
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@ -23,4 +23,4 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
PLATFORM_CPPFLAGS += -DCONFIG_74xx_7xx -ffixed-r2 -ffixed-r29 -mstring
PLATFORM_CPPFLAGS += -DCONFIG_74xx_7xx -ffixed-r2 -mstring

2
cpu/mpc512x/config.mk
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@ -22,4 +22,4 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_MPC512X -DCONFIG_E300 \
-ffixed-r2 -ffixed-r29 -msoft-float -mcpu=603e
-ffixed-r2 -msoft-float -mcpu=603e

2
cpu/mpc5xx/config.mk
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@ -30,7 +30,7 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_5xx -ffixed-r2 -ffixed-r29 -mpowerpc -msoft-float
PLATFORM_CPPFLAGS += -DCONFIG_5xx -ffixed-r2 -mpowerpc -msoft-float
# Use default linker script. Board port can override in board/*/config.mk
LDSCRIPT := $(SRCTREE)/cpu/mpc5xx/u-boot.lds

2
cpu/mpc5xxx/config.mk
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@ -23,7 +23,7 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_MPC5xxx -ffixed-r2 -ffixed-r29 \
PLATFORM_CPPFLAGS += -DCONFIG_MPC5xxx -ffixed-r2 \
-mstring -mcpu=603e -mmultiple
# Use default linker script. Board port can override in board/*/config.mk

2
cpu/mpc8220/config.mk
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@ -23,7 +23,7 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_MPC8220 -ffixed-r2 -ffixed-r29 \
PLATFORM_CPPFLAGS += -DCONFIG_MPC8220 -ffixed-r2 \
-mstring -mcpu=603e -mmultiple
# Use default linker script. Board port can override in board/*/config.mk

2
cpu/mpc824x/config.mk
View File

@ -23,7 +23,7 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
PLATFORM_CPPFLAGS += -DCONFIG_MPC824X -ffixed-r2 -ffixed-r29 -mstring -mcpu=603e -msoft-float
PLATFORM_CPPFLAGS += -DCONFIG_MPC824X -ffixed-r2 -mstring -mcpu=603e -msoft-float
# Use default linker script. Board port can override in board/*/config.mk
LDSCRIPT := $(SRCTREE)/cpu/mpc824x/u-boot.lds

2
cpu/mpc8260/config.mk
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@ -23,7 +23,7 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_8260 -DCONFIG_CPM2 -ffixed-r2 -ffixed-r29 \
PLATFORM_CPPFLAGS += -DCONFIG_8260 -DCONFIG_CPM2 -ffixed-r2 \
-mstring -mcpu=603e -mmultiple
# Use default linker script. Board port can override in board/*/config.mk

2
cpu/mpc83xx/config.mk
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@ -23,7 +23,7 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_MPC83XX -DCONFIG_E300 \
-ffixed-r2 -ffixed-r29 -msoft-float
-ffixed-r2 -msoft-float
# Use default linker script. Board port can override in board/*/config.mk
LDSCRIPT := $(SRCTREE)/cpu/mpc83xx/u-boot.lds

3
cpu/mpc85xx/config.mk
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@ -23,4 +23,5 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_MPC85xx -DCONFIG_E500 -ffixed-r2 -ffixed-r29 -Wa,-me500 -msoft-float -mno-string
PLATFORM_CPPFLAGS += -DCONFIG_MPC85xx -DCONFIG_E500 -ffixed-r2 \
-Wa,-me500 -msoft-float -mno-string

2
cpu/mpc86xx/config.mk
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@ -23,4 +23,4 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
PLATFORM_CPPFLAGS += -DCONFIG_MPC86xx -ffixed-r2 -ffixed-r29 -mstring
PLATFORM_CPPFLAGS += -DCONFIG_MPC86xx -ffixed-r2 -mstring

2
cpu/mpc86xx/start.S
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@ -723,7 +723,7 @@ relocate_code:
mr r1, r3 /* Set new stack pointer */
mr r9, r4 /* Save copy of Global Data pointer */
mr r29, r9 /* Save for DECLARE_GLOBAL_DATA_PTR */
mr r2, r9 /* Save for DECLARE_GLOBAL_DATA_PTR */
mr r10, r5 /* Save copy of Destination Address */
mr r3, r5 /* Destination Address */

2
cpu/mpc8xx/config.mk
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@ -23,4 +23,4 @@
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
PLATFORM_CPPFLAGS += -DCONFIG_8xx -ffixed-r2 -ffixed-r29 -mstring -mcpu=860 -msoft-float
PLATFORM_CPPFLAGS += -DCONFIG_8xx -ffixed-r2 -mstring -mcpu=860 -msoft-float

2
cpu/ppc4xx/config.mk
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@ -22,7 +22,7 @@
#
PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
PLATFORM_CPPFLAGS += -DCONFIG_4xx -ffixed-r2 -ffixed-r29 -mstring -msoft-float
PLATFORM_CPPFLAGS += -DCONFIG_4xx -ffixed-r2 -mstring -msoft-float
cfg=$(shell grep configs $(OBJTREE)/include/config.h | sed 's/.*<\(configs.*\)>/\1/')
is440=$(shell grep CONFIG_440 $(TOPDIR)/include/$(cfg))

2
doc/README.standalone
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@ -21,7 +21,7 @@ Design Notes on Exporting U-Boot Functions to Standalone Applications:
2. The pointer to the jump table is passed to the application in a
machine-dependent way. PowerPC, ARM and MIPS architectures use a
dedicated register to hold the pointer to the 'global_data'
structure: r29 on PowerPC, r8 on ARM and k0 on MIPS. The x86
structure: r2 on PowerPC, r8 on ARM and k0 on MIPS. The x86
architecture does not use such a register; instead, the pointer to
the 'global_data' structure is passed as 'argv[-1]' pointer.

4
examples/stubs.c
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@ -25,14 +25,14 @@ gd_t *global_data;
: : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
#elif defined(CONFIG_PPC)
/*
* r29 holds the pointer to the global_data, r11 is a call-clobbered
* r2 holds the pointer to the global_data, r11 is a call-clobbered
* register
*/
#define EXPORT_FUNC(x) \
asm volatile ( \
" .globl " #x "\n" \
#x ":\n" \
" lwz %%r11, %0(%%r29)\n" \
" lwz %%r11, %0(%%r2)\n" \
" lwz %%r11, %1(%%r11)\n" \
" mtctr %%r11\n" \
" bctr\n" \

2
examples/test_burst_lib.S
View File

@ -70,7 +70,7 @@ mmu_init:
* we can load the instruction and data TLB registers with the
* same values.
*/
lwz r9,20(r29) /* gd->ram_size */
lwz r9,20(r2) /* gd->ram_size */
addis r9,r9,-0x80
mr r8, r9 /* Higher 8 Meg in SDRAM */

6
examples/x86-testapp.c
View File

@ -30,11 +30,11 @@ asm volatile ( \
asm volatile ( \
" .globl mon_" #x "\n" \
"mon_" #x ":\n" \
" lwz %%r11, %0(%%r29)\n" \
" lwz %%r11, %0(%%r2)\n" \
" lwz %%r11, %1(%%r11)\n" \
" mtctr %%r11\n" \
" bctr\n" \
: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "r11", "r29");
: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "r11", "r2");
#elif defined(__arm__)
#define EXPORT_FUNC(x) \
asm volatile ( \
@ -67,7 +67,7 @@ int main(void)
#if defined(__i386__)
xxx_t *pq;
#elif defined(__powerpc__)
register volatile xxx_t *pq asm("r29");
register volatile xxx_t *pq asm("r2");
#elif defined(__arm__)
register volatile xxx_t *pq asm("r8");
#elif defined(__mips__)

2
include/asm-ppc/global_data.h
View File

@ -163,7 +163,7 @@ typedef struct global_data {
#define GD_FLG_SILENT 0x00004 /* Silent mode */
#if 1
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r29")
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r2")
#else /* We could use plain global data, but the resulting code is bigger */
#define XTRN_DECLARE_GLOBAL_DATA_PTR extern
#define DECLARE_GLOBAL_DATA_PTR XTRN_DECLARE_GLOBAL_DATA_PTR \