mirror of
https://github.com/devkitPro/buildscripts.git
synced 2026-03-27 04:14:41 -05:00
updated with Sasq's crt0 mods
added itcm section to linker script
This commit is contained in:
Dave Murphy
parent
c8ce51a0bf
commit
dd5fa773e9
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@ -8,8 +8,10 @@ MEMORY {
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iwram : ORIGIN = 0x037f8000, LENGTH = 32K
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ewram : ORIGIN = 0x02004000, LENGTH = (4M - 16K)
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dtcm : ORIGIN = 0x00800000, LENGTH = 16K
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itcm : ORIGIN = 0x01000000, LENGTH = 32K
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}
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__itcm_start = 0x01000000;
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__iwram_start = 0x037f8000;
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__iwram_end = 0x03800000;
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__ewram_end = 0x02400000;
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@ -160,7 +162,18 @@ SECTIONS
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} >dtcm = 0xff
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__dtcm_end = . ;
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__appended_data = __dtcm_lma + SIZEOF(.dtcm) ;
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__itcm_lma = __dtcm_lma + SIZEOF(.data);
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.itcm __itcm_start : AT (__itcm_lma)
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{
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__itcm_start = ABSOLUTE(.);
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*(.itcm)
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*(.itcm.*)
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. = ALIGN(4);
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} >itcm = 0xff
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__itcm_end = . ;
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__appended_data = __itcm_lma + SIZEOF(.itcm) ;
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@ -1,136 +1,213 @@
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@---------------------------------------------------------------------------------
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.section ".init"
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.global _start
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@---------------------------------------------------------------------------------
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.align 4
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.arm
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@---------------------------------------------------------------------------------
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_start:
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@---------------------------------------------------------------------------------
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.section ".init"
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.global _start
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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.align 4
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.arm
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_start:
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mov r0, #0x04000000 @ IME = 0;
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add r0, r0, #208
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strh r0, [r0]
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add r0, r0, #0x208
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strh r0, [r0]
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ldr r1, =0x00002078 @ disable DTCM and protection unit
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mcr p15, 0, r1, c1, c0
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@mrc p15, 0, r0, c1, c0, 0
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@ldr r1, =0xF9005
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@bic r0, r0, r1
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@mcr p15, 0, r0, c1, c0, 0
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@
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@ Protection Unit Setup added by Sasq
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@ With cache and write buffer turned on things goes shitloads faster!
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@
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@ Disable cache
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mov r0, #0
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mcr p15, 0, r0, c7, c5, 0 @ Instruction cache
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mcr p15, 0, r0, c7, c6, 0 @ Data cache
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@ Wait for write buffer to empty
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mcr p15, 0, r0, c7, c10, 4
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ldr r0, =0x0080000A
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mcr p15, 0, r0, c9, c1 @ TCM base = 0x00800*4096, size = 16 KB
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mrc p15, 0, r0, c1, c0 @ throw-away read of cp15.c1
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orr r1, r1, #0x10000
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mcr p15, 0, r1, c1, c0 @ cp15.c1 = 0x00012078;
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mcr p15, 0, r0, c9, c1 @ TCM base = 0x00800*4096, size = 16 KB
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@ Setup memory regions similar to Release Version
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ldr r0,=(0b110010 | 0x04000000 | 1)
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mcr p15, 0, r0, c6, c0, 0
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ldr r0,=(0b101010 | 0x02000000 | 1)
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mcr p15, 0, r0, c6, c1, 0
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ldr r0,=(0b100010| 0x027C0000 | 1)
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mcr p15, 0, r0, c6, c2, 0
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mov r0, #0x12 @ Switch to IRQ Mode
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msr cpsr, r0
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ldr sp, =__sp_irq @ Set IRQ stack
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ldr r0,=(0b110100| 0x08000000 | 1)
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mcr p15, 0, r0, c6, c3, 0
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mov r0, #0x13 @ Switch to SVC Mode
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msr cpsr, r0
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ldr sp, =__sp_svc @ Set SVC stack
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@ldr r0,=(0b011010 | 0x027C0000 | 1)
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ldr r0,=(0b011010 | 0x00800000 | 1)
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mcr p15, 0, r0, c6, c4, 0
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mov r0, #0x1F @ Switch to System Mode
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ldr r0,=(0b011100 | 0x01000000 | 1)
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mcr p15, 0, r0, c6, c5, 0
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ldr r0,=(0b011100 | 0xFFFF0000 | 1)
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mcr p15, 0, r0, c6, c6, 0
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ldr r0,=(0b010110 | 0x027FF000 | 1)
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mcr p15, 0, r0, c6, c7, 0
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@ Write buffer enable
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ldr r0,=0x2
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mcr p15, 0, r0, c3, c0, 0
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@ DCache & ICache enable
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ldr r0,=0x42
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mcr p15, 0, r0, c2, c0, 0
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mcr p15, 0, r0, c2, c0, 1
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@ IAccess
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ldr r0,=0x05100011
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mcr p15, 0, r0, c5, c0, 3
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@ DAccess
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ldr r0,=0x15111011
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mcr p15, 0, r0, c5, c0, 2
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@ Enable Protection Unit, ICache, DCache, ITCM & DTCM
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mrc p15, 0, r0, c1, c0, 0
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ldr r1,=0x35003
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@ldr r1,=0x10000
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orr r0,r0,r1
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mcr p15, 0, r0, c1, c0, 0
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mov r0, #0x12 @ Switch to IRQ Mode
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msr cpsr, r0
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ldr sp, =__sp_usr @ Set user stack
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ldr r0, =__bss_start @ Clear BSS section to 0x00
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ldr r1, =__bss_end
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sub r1, r1, r0
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bl ClearMem
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ldr r0, =__sbss_start @ Clear SBSS section to 0x00
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ldr r1, =__sbss_end
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sub r1, r1, r0
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bl ClearMem
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ldr r1, =__data_lma @ Copy initialized data (data section) from LMA to VMA
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ldr r2, =__data_start
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ldr r4, =__data_end
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bl CopyMemCheck
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ldr r1, =__iwram_lma @ Copy internal work ram (iwram section) from LMA to VMA
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ldr r2, =__iwram_start
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ldr r4, =__iwram_end
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bl CopyMemCheck
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ldr r1, =__dtcm_lma @ Copy data tightly coupled memory from LMA to VMA
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ldr r2, =__dtcm_start
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ldr r4, =__dtcm_end
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bl CopyMemCheck
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ldr r1, =fake_heap_end @ set heap end
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ldr r0, =__eheap_end
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str r0, [r1]
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ldr r3, =_init @ global constructors
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bl _call_via_r3
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mov r0, #0 @ int argc
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mov r1, #0 @ char *argv[]
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ldr r3, =main
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bx r3
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@---------------------------------------------------------------------------------
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@ If the user ever returns, go to an infinte loop
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@---------------------------------------------------------------------------------
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ldr r0, =ILoop
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ldr r0, [r0]
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ldr r1, =0x027FFE78
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str r0, [r1]
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bx r1
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ILoop:
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b ILoop
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@---------------------------------------------------------------------------------
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ldr sp, =__sp_irq @ Set IRQ stack
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mov r0, #0x13 @ Switch to SVC Mode
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msr cpsr, r0
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ldr sp, =__sp_svc @ Set SVC stack
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mov r0, #0x1F @ Switch to System Mode
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msr cpsr, r0
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ldr sp, =__sp_usr @ Set user stack
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ldr r0, =__bss_start @ Clear BSS section to 0x00
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ldr r1, =__bss_end
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sub r1, r1, r0
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bl ClearMem
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ldr r0, =__sbss_start @ Clear BSS section to 0x00
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ldr r1, =__sbss_end
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sub r1, r1, r0
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bl ClearMem
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ldr r1, =__data_lma @ Copy initialized data (data section) from LMA to VMA (ROM to RAM)
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ldr r2, =__data_start
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ldr r4, =__data_end
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bl CopyMemCheck
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ldr r1, =__iwram_lma @ Copy internal work ram (iwram section) from LMA to VMA (ROM to RAM)
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ldr r2, =__iwram_start
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ldr r4, =__iwram_end
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bl CopyMemCheck
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ldr r1, =__itcm_lma @ Copy instruction tightly coupled memory (itcm section) from LMA to VMA (ROM to RAM)
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ldr r2, =__itcm_start
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ldr r4, =__itcm_end
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bl CopyMemCheck
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ldr r1, =__dtcm_lma @ Copy data tightly coupled memory (dtcm section) from LMA to VMA (ROM to RAM)
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ldr r2, =__dtcm_start
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ldr r4, =__dtcm_end
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bl CopyMemCheck
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ldr r1, =fake_heap_end @ set heap end
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ldr r0, =__eheap_end
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str r0, [r1]
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ldr r3, =_init @ global constructors
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bl _call_via_r3
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mov r0, #0 @ int argc
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mov r1, #0 @ char *argv[]
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ldr r3, =main
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bl _call_via_r3 @ jump to user code
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@ If the user ever returns, go to an infinte loop
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ldr r0, =ILoop
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ldr r0, [r0]
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ldr r1, =0x027FFE78
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str r0, [r1]
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bx r1
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ILoop: b ILoop
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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@
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@ Clear memory to 0x00 if length != 0
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@ r0 = Start Address
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@ r1 = Length
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@---------------------------------------------------------------------------------
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ClearMem:
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@---------------------------------------------------------------------------------
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mov r2, #3 @ Round down to nearest word boundary
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add r1, r1, r2 @ Shouldn't be needed
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bics r1, r1, r2 @ Clear 2 LSB (and set Z)
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bxeq lr @ Quit if copy size is 0
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mov r2, #0
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ClrLoop:
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stmia r0!, {r2}
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subs r1, r1, #4
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@ r0 = Start Address
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@ r1 = Length
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@
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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ClearMem:
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mov r2, #3 @ Round down to nearest word boundary
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add r1, r1, r2 @ Shouldn't be needed
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bics r1, r1, r2 @ Clear 2 LSB (and set Z)
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bxeq lr @ Quit if copy size is 0
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mov r2, #0
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ClrLoop:
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stmia r0!, {r2}
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subs r1, r1, #4
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bne ClrLoop
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bx lr
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@---------------------------------------------------------------------------------
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@ Copy memory if length != 0
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@ r1 = Source Address
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bx lr
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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@
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@ Copy memory if length != 0
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@ r1 = Source Address
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@ r2 = Dest Address
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@ r4 = Dest Address + Length
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@---------------------------------------------------------------------------------
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CopyMemCheck:
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@---------------------------------------------------------------------------------
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sub r3, r4, r2 @ Is there any data to copy?
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@---------------------------------------------------------------------------------
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@ Copy memory
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@ r1 = Source Address
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@ r4 = Dest Address + Length
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@
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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CopyMemCheck:
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sub r3, r4, r2 @ Is there any data to copy?
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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@
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@ Copy memory
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@ r1 = Source Address
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@ r2 = Dest Address
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@ r3 = Length
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@---------------------------------------------------------------------------------
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CopyMem:
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@---------------------------------------------------------------------------------
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mov r0, #3 @ These commands are used in cases where
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add r3, r3, r0 @ the length is not a multiple of 4,
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bics r3, r3, r0 @ even though it should be.
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bxeq lr @ Length is zero, so exit
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CIDLoop:
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ldmia r1!, {r0}
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stmia r2!, {r0}
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subs r3, r3, #4
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@ r3 = Length
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@
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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CopyMem:
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mov r0, #3 @ These commands are used in cases where
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add r3, r3, r0 @ the length is not a multiple of 4,
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bics r3, r3, r0 @ even though it should be.
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bxeq lr @ Length is zero, so exit
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CIDLoop:
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ldmia r1!, {r0}
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stmia r2!, {r0}
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subs r3, r3, #4
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bne CIDLoop
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bx lr
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@---------------------------------------------------------------------------------
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.align
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.pool
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.end
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bx lr
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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.align
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.pool
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.end
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