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adjust arm7 code lma

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DSi firmware requires arm7 code to start in ewram
This commit is contained in:
Dave Murphy 2016-12-27 13:37:17 +00:00
parent ccc156d51d
commit 0c55dc8db9
2 changed files with 55 additions and 39 deletions
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83
dkarm-eabi/crtls/ds_arm7.ld
View File

@ -3,9 +3,9 @@ OUTPUT_ARCH(arm)
ENTRY(_start)
MEMORY {
rom : ORIGIN = 0x08000000, LENGTH = 32M
iwram : ORIGIN = 0x037f8000, LENGTH = 96K
ewram : ORIGIN = 0x02380000, LENGTH = 512K - 48K
rom : ORIGIN = 0x08000000, LENGTH = 32M
iwram : ORIGIN = 0x037f8000, LENGTH = 96K
}
__iwram_start = ORIGIN(iwram);
@ -23,36 +23,29 @@ SECTIONS
{
.crt0 :
{
__text_start = . ;
KEEP (*(.crt0))
. = ALIGN(4); /* REQUIRED. LD is flaky without it. */
} >iwram = 0xff
.init :
{
KEEP (*(SORT_NONE(.init)))
} >iwram = 0xff
.plt : { *(.plt) } >iwram = 0xff
} >ewram
__arm7_lma__ = .;
.text : /* ALIGN (4): */
{
__arm7_start__ = .;
KEEP (*(SORT_NONE(.init)))
*(.plt)
*(.text .stub .text.* .gnu.linkonce.t.*)
KEEP (*(.text.*personality*))
/* .gnu.warning sections are handled specially by elf32.em. */
*(.gnu.warning)
*(.glue_7t) *(.glue_7) *(.vfp11_veneer)
. = ALIGN(4); /* REQUIRED. LD is flaky without it. */
} >iwram = 0xff
} >iwram AT>ewram
.fini :
{
KEEP (*(.fini))
} >iwram =0xff
__text_end = . ;
} >iwram AT>ewram
.rodata :
{
@ -63,27 +56,38 @@ SECTIONS
*(.gnu.linkonce.r*)
SORT(CONSTRUCTORS)
. = ALIGN(4); /* REQUIRED. LD is flaky without it. */
} >iwram = 0xff
} >iwram AT>ewram
.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >iwram
__exidx_start = .;
.ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) } >iwram
__exidx_end = .;
.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >iwram AT>ewram
.ARM.exidx : {
__exidx_start = .;
*(.ARM.exidx* .gnu.linkonce.armexidx.*)
__exidx_end = .;
} >iwram AT>ewram
/* Ensure the __preinit_array_start label is properly aligned. We
could instead move the label definition inside the section, but
the linker would then create the section even if it turns out to
be empty, which isn't pretty. */
. = ALIGN(32 / 8);
PROVIDE (__preinit_array_start = .);
.preinit_array : { KEEP (*(.preinit_array)) } >iwram = 0xff
PROVIDE (__preinit_array_end = .);
PROVIDE (__init_array_start = .);
.init_array : { KEEP (*(.init_array)) } >iwram = 0xff
PROVIDE (__init_array_end = .);
PROVIDE (__fini_array_start = .);
.fini_array : { KEEP (*(.fini_array)) } >iwram = 0xff
PROVIDE (__fini_array_end = .);
.preinit_array : {
. = ALIGN(32 / 8);
PROVIDE (__preinit_array_start = .);
KEEP (*(.preinit_array))
PROVIDE (__preinit_array_end = .);
}>iwram AT>ewram
.init_array : {
PROVIDE (__init_array_start = .);
KEEP (*(.init_array))
PROVIDE (__init_array_end = .);
} >iwram AT>ewram
.fini_array : {
PROVIDE (__fini_array_start = .);
KEEP (*(.fini_array))
PROVIDE (__fini_array_end = .);
} >iwram AT>ewram
.ctors :
{
@ -98,7 +102,7 @@ SECTIONS
KEEP (*(SORT(.ctors.*)))
KEEP (*(.ctors))
. = ALIGN(4); /* REQUIRED. LD is flaky without it. */
} >iwram = 0xff
} >iwram AT>ewram
.dtors :
{
@ -107,19 +111,19 @@ SECTIONS
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
. = ALIGN(4); /* REQUIRED. LD is flaky without it. */
} >iwram = 0xff
} >iwram AT>ewram
.eh_frame :
{
KEEP (*(.eh_frame))
. = ALIGN(4); /* REQUIRED. LD is flaky without it. */
} >iwram = 0xff
} >iwram AT>ewram
.gcc_except_table :
{
*(.gcc_except_table)
. = ALIGN(4); /* REQUIRED. LD is flaky without it. */
} >iwram = 0xff
} >iwram AT>ewram
.jcr : { KEEP (*(.jcr)) } >iwram = 0
.got : { *(.got.plt) *(.got) } >iwram = 0
@ -131,10 +135,12 @@ SECTIONS
CONSTRUCTORS
. = ALIGN(4);
__data_end = ABSOLUTE(.) ;
} >iwram = 0xff
} >iwram AT>ewram
.bss ALIGN(4) :
.bss ALIGN(4) (NOLOAD) :
{
__arm7_end__ = .;
__bss_start = ABSOLUTE(.);
__bss_start__ = ABSOLUTE(.);
*(.dynbss)
@ -179,6 +185,5 @@ SECTIONS
.debug_funcnames 0 : { *(.debug_funcnames) }
.debug_typenames 0 : { *(.debug_typenames) }
.debug_varnames 0 : { *(.debug_varnames) }
.stack 0x80000 : { _stack = .; *(.stack) }
/* These must appear regardless of . */
}

11
dkarm-eabi/crtls/ds_arm7_crt0.s
View File

@ -23,6 +23,14 @@ _start:
msr cpsr, r0
ldr sp, =__sp_usr @ Set user stack
@---------------------------------------------------------------------------------
@ Copy initialized data (data section) from LMA to VMA (EWRAM to IWRAM)
@---------------------------------------------------------------------------------
ldr r1, =__arm7_lma__
ldr r2, =__arm7_start__
ldr r4, =__arm7_end__
bl CopyMemCheck
ldr r0, =__bss_start__ @ Clear BSS section to 0x00
ldr r1, =__bss_end__
sub r1, r1, r0
@ -70,6 +78,9 @@ ClrLoop:
@---------------------------------------------------------------------------------
CopyMemCheck:
@---------------------------------------------------------------------------------
cmp r1, r2
bxeq lr
sub r3, r4, r2 @ Is there any data to copy?
@---------------------------------------------------------------------------------
@ Copy memory