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Introduce preamble segment and disassemble preamble

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This commit is contained in:
Ryan Dwyer
2021-10-05 23:24:25 +10:00
parent d6a0d4745a
commit d425d4f11c
12 changed files with 78 additions and 74 deletions
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src/lib/boot.c
-56
View File
@@ -39,62 +39,6 @@ u32 var8008d264;
u32 var8008d268;
u32 var8008d26c;
/**
* This function is generated automatically by makerom. It clears the BSS
* segment, sets the stack pointer to 0x80000f10 and then calls boot.
*/
#if VERSION >= VERSION_PAL_FINAL
GLOBAL_ASM(
glabel preamble
/* 1000: 3c088009 */ lui $t0,%hi(_bssSegmentStart)
/* 1004: 3c090002 */ lui $t1,0x2
/* 1008: 2508ae20 */ addiu $t0,$t0,%lo(_bssSegmentStart)
/* 100c: 352923a0 */ ori $t1,$t1,0x23f0
.L00001010:
/* 1010: 2129fff8 */ addi $t1,$t1,-8
/* 1014: ad000000 */ sw $zero,0x0($t0)
/* 1018: ad000004 */ sw $zero,0x4($t0)
/* 101c: 1520fffc */ bnez $t1,.L00001010
/* 1020: 21080008 */ addi $t0,$t0,0x8
/* 1024: 3c0a8000 */ lui $t2,0x8000
/* 1028: 3c1d8000 */ lui $sp,0x8000
/* 102c: 254a1050 */ addiu $t2,$t2,0x1050
/* 1030: 01400008 */ jr $t2
/* 1034: 27bd0f10 */ addiu $sp,$sp,0xf10
/* 1038: 00000000 */ nop
/* 103c: 00000000 */ nop
/* 1040: 00000000 */ nop
/* 1044: 00000000 */ nop
/* 1048: 00000000 */ nop
/* 104c: 00000000 */ nop
);
#else
GLOBAL_ASM(
glabel preamble
/* 1000: 3c088009 */ lui $t0,%hi(_bssSegmentStart)
/* 1004: 3c090002 */ lui $t1,0x2
/* 1008: 2508ae20 */ addiu $t0,$t0,%lo(_bssSegmentStart)
/* 100c: 352923a0 */ ori $t1,$t1,0x23a0
.L00001010:
/* 1010: 2129fff8 */ addi $t1,$t1,-8
/* 1014: ad000000 */ sw $zero,0x0($t0)
/* 1018: ad000004 */ sw $zero,0x4($t0)
/* 101c: 1520fffc */ bnez $t1,.L00001010
/* 1020: 21080008 */ addi $t0,$t0,0x8
/* 1024: 3c0a8000 */ lui $t2,0x8000
/* 1028: 3c1d8000 */ lui $sp,0x8000
/* 102c: 254a1050 */ addiu $t2,$t2,0x1050
/* 1030: 01400008 */ jr $t2
/* 1034: 27bd0f10 */ addiu $sp,$sp,0xf10
/* 1038: 00000000 */ nop
/* 103c: 00000000 */ nop
/* 1040: 00000000 */ nop
/* 1044: 00000000 */ nop
/* 1048: 00000000 */ nop
/* 104c: 00000000 */ nop
);
#endif
/**
* Sets up TLB index 0 (0x70000000), then calls init.
*/
src/preamble/preamble.s
+26
View File
@@ -0,0 +1,26 @@
#include "macros.inc"
.set noat
.set noreorder
.text
/**
* This function is generated automatically by makerom. It clears the BSS
* segment, sets the stack pointer to 0x80000f10 and then calls boot.
*/
glabel preamble
lui $t0, %hi(_bssSegmentStart)
lui $t1, %hi(_bssSegmentLen)
addiu $t0, $t0, %lo(_bssSegmentStart)
ori $t1, $t1, %lo(_bssSegmentLen)
.L00001010:
addi $t1, $t1, -8
sw $zero, 0($t0)
sw $zero, 4($t0)
bnez $t1, .L00001010
addi $t0, $t0, 8
lui $t2, %hi(bootFromPreamble)
lui $sp, 0x8000
addiu $t2, $t2, %lo(bootFromPreamble)
jr $t2
addiu $sp, $sp, 0xf10