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https://github.com/switchbrew/libnx.git
synced 2025-08-05 16:09:24 +02:00
First attempt at GOT
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@ -2,5 +2,5 @@ install:
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cp base_rules $(DEVKITA64)/
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cp base_tools $(DEVKITA64)/
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cp switch_rules $(DEVKITA64)/
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cp lib/switch.ld $(DEVKITA64)/lib/
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cp lib/switch.specs $(DEVKITA64)/lib/
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cp lib/switch.ld $(DEVKITA64)/aarch64-none-elf/lib/
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cp lib/switch.specs $(DEVKITA64)/aarch64-none-elf/lib/
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@ -63,10 +63,13 @@ SECTIONS
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*(.data.*)
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*(.gnu.linkonce.d*)
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CONSTRUCTORS
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*(.got)
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. = ALIGN(4);
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__got_start__ = .;
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*(.got)
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__got_end__ = .;
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} : data
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.tdata ALIGN(4) :
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{
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__tdata_lma = .;
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@ -1,19 +1,41 @@
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.section ".crt0","ax"
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.global _start, _sysexit, main
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_start:
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b startup
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bl startup
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.word 0x454d4f48
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.word 0x57455242
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startup:
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mov x4, x30
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// get aslr base
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sub x30, x30, #4
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// clear .bss
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ldr x0, =__bss_start__
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ldr x1, =__bss_end__
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sub x1, x1, x0
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bl ClearMem
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add x1, x1, #7
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bic x1, x1, #7
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mov x2, #0
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bss_loop:
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str x2, [x0], #8
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subs x1, x1, #8
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bne bss_loop
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// relocate .got
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ldr x0, =__got_start__
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ldr x1, =__got_end__
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sub x1, x1, x0
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add x1, x1, #3
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bic x1, x1, #3
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got_loop:
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ldr x2, [x0]
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add x2, x2, x30
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str x2, [x0], #8
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subs x1, x1, #8
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bne got_loop
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mov x0, #0 // argc
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mov x1, #0 // argv
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@ -23,18 +45,3 @@ startup:
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_sysexit:
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svc 0x7
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ClearMem:
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mov x2, #3 // Round down to nearest word boundary
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add x1, x1, x2 // Shouldn't be needed
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bics x1, x1, x2 // Clear 2 LSB (and set Z)
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beq ClearMem_end // Quit if copy size is 0
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mov x2, #0
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ClrLoop:
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str x2, [x0], #4
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subs x1, x1, #4
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bne ClrLoop
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ClearMem_end:
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ret
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