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SH1: More compact init code, only doing the special vector copy for debug builds. All: Added correct section flags for .init.text

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7640 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2005-10-18 20:51:18 +00:00
parent 09b4743707
commit b4f0afd429
1 changed files with 33 additions and 39 deletions
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72
firmware/crt0.S
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@ -19,7 +19,7 @@
#include "config.h" #include "config.h"
#include "cpu.h" #include "cpu.h"
.section .init.text .section .init.text,"ax",@progbits
.global start .global start
start: start:
#if CONFIG_CPU == TCC730 #if CONFIG_CPU == TCC730
@ -319,15 +319,13 @@ vectors:
/* Fill in code here */ /* Fill in code here */
#else #else
/* Platform: Archos Jukebox /* Platform: Archos Jukebox */
* We begin with some tricks. If we have built our code to be loaded
* via the standalone GDB stub, we will have out VBR at some other
* location than 0x9000000. We must copy the trap vectors for the
* GDB stub to our vector table.
* If, on the other hand, we are running standalone we will have
* the VBR at 0x9000000, and the copy will not do any harm.
*/
mov.l vbr_k,r1 mov.l vbr_k,r1
#ifdef DEBUG
/* If we have built our code to be loaded via the standalone GDB
* stub, we will have out VBR at some other location than 0x9000000.
* We must copy the trap vectors for the GDB stub to our vector table. */
mov.l orig_vbr_k,r2 mov.l orig_vbr_k,r2
/* Move the invalid instruction vector (4) */ /* Move the invalid instruction vector (4) */
@ -389,35 +387,31 @@ vectors:
shll2 r0 shll2 r0
mov.l @(r0,r2),r3 mov.l @(r0,r2),r3
mov.l r3,@(r0,r1) mov.l r3,@(r0,r1)
#endif /* DEBUG */
ldc r1,vbr ldc r1,vbr
/* Now let's get on with the normal business */ /* Now let's get on with the normal business */
mov.l stack_k,r15 mov.l stackend_k,r15
/* zero out bss */ /* zero out bss */
mov.l edata_k,r0 mov.l edata_k,r0
mov.l end_k,r1 mov.l end_k,r1
mov #0,r2 mov #0,r2
start_l: edata_l: /* backwards is faster and shorter */
mov.l r2,@r0 mov.l r2,@-r1
add #4,r0 cmp/hi r0,r1
cmp/ge r1,r0 bt edata_l
bf start_l
nop
/* copy the .iram section */ /* copy the .iram section */
mov.l iramcopy_k,r0 mov.l iramcopy_k,r0
mov.l iram_k,r1 mov.l iram_k,r1
mov.l iramend_k,r2 mov.l iramend_k,r2
copy_l: iramcopy_l:
mov.l @r0,r3 mov.l @r0+,r3
mov.l r3,@r1 mov.l r3,@r1
add #4,r0
add #4,r1 add #4,r1
cmp/ge r2,r1 cmp/hi r1,r2
bf copy_l bt iramcopy_l
nop
/* copy the .data section, for rombased execution */ /* copy the .data section, for rombased execution */
mov.l datacopy_k,r0 mov.l datacopy_k,r0
@ -426,25 +420,22 @@ copy_l:
/* Don't copy if src and dest are equal */ /* Don't copy if src and dest are equal */
cmp/eq r0,r1 cmp/eq r0,r1
bt nodatacopy bt nodatacopy
copy_l2: data_l:
mov.l @r0,r3 mov.l @r0+,r3
mov.l r3,@r1 mov.l r3,@r1
add #4,r0
add #4,r1 add #4,r1
cmp/ge r2,r1 cmp/hi r1,r2
bf copy_l2 bt data_l
nop
nodatacopy: nodatacopy:
/* Munge the main thread stack */ /* Munge the main thread stack */
mov.l stack_k,r2 mov.l stackbegin_k,r0
mov.l deadbeef_k,r0 mov.l stackend_k,r1
mov.l stackbegin_k,r1 mov.l deadbeef_k,r2
munge_loop: munge_l: /* backwards is faster and shorter */
mov.l r0,@r1 mov.l r2,@-r1
add #4,r1 cmp/hi r0,r1
cmp/ge r2,r1 bt munge_l
bf munge_loop
nop
mov #0,r0 mov #0,r0
ldc r0,gbr ldc r0,gbr
@ -455,9 +446,10 @@ munge_loop:
nop nop
.hoo: .hoo:
bra .hoo bra .hoo
nop
.align 2 .align 2
stack_k: stackend_k:
.long _stackend .long _stackend
stackbegin_k: stackbegin_k:
.long _stackbegin .long _stackbegin
@ -483,8 +475,10 @@ main_k:
.long _main .long _main
vbr_k: vbr_k:
.long vectors .long vectors
#ifdef DEBUG
orig_vbr_k: orig_vbr_k:
.long 0x9000000 .long 0x9000000
#endif
.section .resetvectors .section .resetvectors
vectors: vectors: