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Ingenic Jz4740: put stack in IRAM & optimize/clean up crt0.S a bit

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20742 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Maurus Cuelenaere 2009-04-19 15:16:37 +00:00
parent dc8db2a820
commit c147d39bb5
2 changed files with 39 additions and 45 deletions
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24
firmware/target/mips/ingenic_jz47xx/app.lds
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@ -57,17 +57,7 @@ SECTIONS
*(.sdata*);
*(.rel.dyn);
} > DRAM
. = ALIGN(4);
.stack (NOLOAD):
{
*(.stack);
stackbegin = .;
. += 0x2000;
stackend = .;
} > DRAM
. = ALIGN(4);
/* Set the load address of .iram at the same address as .bss
@ -94,6 +84,16 @@ SECTIONS
} > IRAM
_iramcopy = LOADADDR(.iram);
. = ALIGN(4);
.stack (NOLOAD):
{
*(.stack);
stackbegin = .;
. += 0x2000;
stackend = .;
} > IRAM
. = ALIGN(4);
.bss (NOLOAD):
@ -123,7 +123,7 @@ SECTIONS
.audiobufend ENDAUDIOADDR:
{
audiobufend = .;
} > DRAM
}
.codec ENDAUDIOADDR:
{

60
firmware/target/mips/ingenic_jz47xx/crt0.S
View file

@ -39,14 +39,13 @@
#include "mips.h"
.text
.set mips32
.extern system_main
.extern main
.global _start
.section .init.text
.set mips32
.set noreorder
.set noat
@ -102,10 +101,10 @@ _start:
mtc0 zero, C0_TAGLO # TAGLO reg
mtc0 zero, C0_TAGHI # TAGHI reg
_init_cache_loop:
_cache_loop:
cache 0x8, 0(t0) # index store icache tag
cache 0x9, 0(t0) # index store dcache tag
bne t0, t1, _init_cache_loop
bne t0, t1, _cache_loop
addiu t0, t0, 0x20 # 32 bytes per cache line
nop
@ -130,11 +129,11 @@ _init_cache_loop:
la t0, _iramcopy
la t1, _iramstart
la t2, _iramend
_init_iram_loop:
_iram_loop:
lw t3, 0(t0)
sw t3, 0(t1)
addiu t1, 4
bne t1, t2, _init_iram_loop
bne t1, t2, _iram_loop
addiu t0, 4
/*
@ -144,9 +143,9 @@ _init_iram_loop:
*/
la t0, _edata
la t1, _end
_init_bss_loop:
_bss_loop:
sw zero, 0(t0)
bne t0, t1, _init_bss_loop
bne t0, t1, _bss_loop
addiu t0, 4
/*
@ -156,23 +155,23 @@ _init_bss_loop:
*/
la t0, _iedata
la t1, _iend
_init_ibss_loop:
_ibss_loop:
sw zero, 0(t0)
bne t0, t1, _init_ibss_loop
bne t0, t1, _ibss_loop
addiu t0, 4
/*
----------------------------------------------------
Setup stack
Set up stack
----------------------------------------------------
*/
la sp, stackend
la t0, stackbegin
li t1, 0xDEADBEEF
_init_stack_loop:
_stack_loop:
sw t1, 0(t0)
bne t0, sp, _init_stack_loop
bne t0, sp, _stack_loop
addiu t0, t0, 4
/*
@ -180,11 +179,9 @@ _init_stack_loop:
Jump to C code
----------------------------------------------------
*/
la t0, system_main /* Init clocks etc first */
jalr t0
jal system_main /* Init clocks etc first */
nop
la t0, main
jr t0
j main
nop
@ -196,23 +193,19 @@ _init_stack_loop:
*/
.section .vectors.1, "ax", %progbits
la k0, tlb_refill_handler
jr k0
j tlb_refill_handler
nop
.section .vectors.2, "ax", %progbits
la k0, real_exception_handler
jr k0
j real_exception_handler
nop
.section .vectors.3, "ax", %progbits
la k0, real_exception_handler
jr k0
j real_exception_handler
nop
.section .vectors.4, "ax", %progbits
la k0, real_exception_handler
jr k0
j real_exception_handler
nop
.section .vectors, "ax", %progbits
@ -252,13 +245,13 @@ real_exception_handler:
mfhi k0
nop
sw k0, 0x74(sp)
mfc0 k0, C0_STATUS # Status register
mfc0 k0, C0_STATUS
sll zero, 1
sll zero, 1
sll zero, 1
sll zero, 1
sw k0, 0x78(sp)
mfc0 k0, C0_EPC # Exception Program Counter
mfc0 k0, C0_EPC
sll zero, 1
sll zero, 1
sll zero, 1
@ -266,7 +259,7 @@ real_exception_handler:
sw k0, 0x7C(sp)
li k1, M_CauseExcCode
mfc0 k0, C0_CAUSE # C0_CAUSE of last exception
mfc0 k0, C0_CAUSE
and k0, k1
beq zero, k0, _int
nop
@ -280,12 +273,12 @@ _int:
_exception:
move a0, sp
mfc0 a1, C0_CAUSE # C0_CAUSE of last exception
mfc0 a1, C0_CAUSE
sll zero, 1
sll zero, 1
sll zero, 1
sll zero, 1
mfc0 a2, C0_EPC # Exception Program Counter
mfc0 a2, C0_EPC
sll zero, 1
sll zero, 1
sll zero, 1
@ -329,20 +322,21 @@ _exception_return:
mthi k0
nop
lw k0, 0x78(sp)
mtc0 k0, C0_STATUS # Status register
mtc0 k0, C0_STATUS
nop
sll zero, 1
sll zero, 1
sll zero, 1
sll zero, 1
lw k0, 0x7C(sp)
mtc0 k0, C0_EPC # Exception Program Counter
mtc0 k0, C0_EPC
nop
sll zero, 1
sll zero, 1
sll zero, 1
sll zero, 1
addiu sp, 0x80
eret # Exception Return
eret
nop
.set reorder
.set at