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| author | Xavi Del Campo <xavi.dcr@tutanota.com> | 2020-01-31 10:32:23 +0100 |
|---|---|---|
| committer | Xavi Del Campo <xavi.dcr@tutanota.com> | 2020-01-31 10:32:23 +0100 |
| commit | 7c24e9a9b02b04dcaf9507acb94091ea70a2c02d (patch) | |
| tree | c28d0748652ad4b4222309e46e6cfc82c0906220 /libpsx/src/start | |
| parent | a2b7b6bb1cc2f4a3258b7b2dbc92399d151f864d (diff) | |
| download | psxsdk-7c24e9a9b02b04dcaf9507acb94091ea70a2c02d.tar.gz | |
Imported pristine psxsdk-20190410 from official repo
Diffstat (limited to 'libpsx/src/start')
| -rwxr-xr-x | libpsx/src/start/start.s | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/libpsx/src/start/start.s b/libpsx/src/start/start.s new file mode 100755 index 0000000..5c72f79 --- /dev/null +++ b/libpsx/src/start/start.s @@ -0,0 +1,322 @@ +# This is the start code for the PSXSDK.
+# It sets needed things up, and calls the setup and the main function.
+
+# This has to be linked in as the first object when using ld, so that it
+# appears at the start of the .text section.
+# If a ldscript is being used, it is sufficient to specify this as the first
+# startup object.
+
+# nextvolume (2014-03-17):
+# fixed possible stack corruption.
+
+ .align 16
+ .text
+.global _start
+#.global exit
+.extern call_atexit_callbacks
+#.global vblank_handler
+.extern vblank_handler
+.extern vblank_handler_callback
+
+.extern rcnt_handler
+.extern rcnt_handler_evfield
+.extern rcnt_handler_callback
+
+.extern run_bios
+.extern is_load_delay_ok
+.extern exit
+
+.extern get_cop0_status
+.extern set_cop0_status
+.extern get_cop0_epc
+#.global run_bios +#.global is_load_delay_ok
+
+_start:
+ li $29, 0x801fff00 # Load stack pointer
+ li $k1, 0x1f800000 # set to hardware base
+
+ addiu $sp, $sp, -24
+ jal ResetEntryInt
+ nop
+
+ jal psxsdk_setup
+ nop
+
+ jal main
+ nop
+
+_real_exit:
+ la $a0, progtermfmt
+ move $a1, $v0
+
+ jal printf
+ nop
+
+ jal call_atexit_callbacks
+ nop
+
+inf_loop:
+ j inf_loop
+ nop
+
+# VBlank handler
+
+vblank_handler:
+ addi $sp, -120 +.set noat
+ sw $at, 0($sp)
+ mfhi $at
+ sw $at, 112($sp)
+ mflo $at
+ sw $at, 116($sp) +.set at
+ sw $v0, 4($sp)
+ sw $v1, 8($sp)
+ sw $a0, 12($sp)
+ sw $a1, 16($sp)
+ sw $a2, 20($sp)
+ sw $a3, 24($sp)
+ sw $t0, 28($sp)
+ sw $t1, 32($sp)
+ sw $t2, 36($sp)
+ sw $t3, 40($sp)
+ sw $t4, 44($sp)
+ sw $t5, 48($sp)
+ sw $t6, 52($sp)
+ sw $t7, 56($sp)
+ sw $s0, 60($sp)
+ sw $s1, 64($sp)
+ sw $s2, 68($sp)
+ sw $s3, 72($sp)
+ sw $s4, 76($sp)
+ sw $s5, 80($sp)
+ sw $s6, 84($sp)
+ sw $s7, 88($sp)
+ sw $t8, 92($sp)
+ sw $t9, 96($sp)
+ sw $gp, 100($sp)
+ sw $s8, 104($sp)
+ sw $ra, 108($sp)
+
+vblank_fire_user_handler:
+
+ la $t0, vblank_handler_callback + lw $t1, 0($t0)
+
+ addiu $sp, $sp, -24
+ jalr $t1
+ nop
+ addiu $sp, $sp, 24
+
+vblank_acknowledge_irq:
+ li $t0, 0x1f801070 # IPENDING
+
+ lw $t1, 0($t0)
+ nop
+ nop
+ xori $t1, $t1, 1 # Acknowledge VBlank IRQ
+ sw $t1, 0($t0)
+
+vblank_handler_end: +.set noat
+ lw $at, 112($sp)
+ nop
+ mthi $at
+ lw $at, 116($sp)
+ nop
+ mtlo $at + lw $at, 0($sp) +.set at + lw $v0, 4($sp)
+ lw $v1, 8($sp)
+ lw $a0, 12($sp)
+ lw $a1, 16($sp)
+ lw $a2, 20($sp)
+ lw $a3, 24($sp)
+ lw $t0, 28($sp)
+ lw $t1, 32($sp)
+ lw $t2, 36($sp)
+ lw $t3, 40($sp)
+ lw $t4, 44($sp)
+ lw $t5, 48($sp)
+ lw $t6, 52($sp)
+ lw $t7, 56($sp)
+ lw $s0, 60($sp)
+ lw $s1, 64($sp)
+ lw $s2, 68($sp)
+ lw $s3, 72($sp)
+ lw $s4, 76($sp)
+ lw $s5, 80($sp)
+ lw $s6, 84($sp)
+ lw $s7, 88($sp)
+ lw $t8, 92($sp)
+ lw $t9, 96($sp)
+ lw $gp, 100($sp)
+ lw $s8, 104($sp)
+ lw $ra, 108($sp)
+ addi $sp, 120
+ jr $ra
+ nop
+
+# Root counter handler
+
+rcnt_handler:
+ addi $sp, -120
+.set noat
+ sw $at, 0($sp)
+ mfhi $at
+ sw $at, 112($sp)
+ mflo $at
+ sw $at, 116($sp)
+.set at
+ sw $v0, 4($sp)
+ sw $v1, 8($sp)
+ sw $a0, 12($sp)
+ sw $a1, 16($sp)
+ sw $a2, 20($sp)
+ sw $a3, 24($sp)
+ sw $t0, 28($sp)
+ sw $t1, 32($sp)
+ sw $t2, 36($sp)
+ sw $t3, 40($sp)
+ sw $t4, 44($sp)
+ sw $t5, 48($sp)
+ sw $t6, 52($sp)
+ sw $t7, 56($sp)
+ sw $s0, 60($sp)
+ sw $s1, 64($sp)
+ sw $s2, 68($sp)
+ sw $s3, 72($sp)
+ sw $s4, 76($sp)
+ sw $s5, 80($sp)
+ sw $s6, 84($sp)
+ sw $s7, 88($sp)
+ sw $t8, 92($sp)
+ sw $t9, 96($sp)
+ sw $gp, 100($sp)
+ sw $s8, 104($sp)
+ sw $ra, 108($sp)
+
+rcnt_fire_user_handler:
+ la $t0, rcnt_handler_callback + lw $t1, 0($t0)
+
+ addiu $sp, $sp, -24
+ jalr $t1
+ nop
+ addiu $sp, $sp, 24
+
+rcnt_acknowledge_irq:
+ li $t0, 0x1f801070 # IPENDING
+ la $t2, rcnt_handler_evfield
+
+ lw $t1, 0($t0)
+ nop
+ nop
+ xor $t1, $t1, $t2 # Acknowledge Root Counter IRQ
+ sw $t1, 0($t0)
+
+rcnt_handler_end: +.set noat
+ lw $at, 112($sp)
+ nop
+ mthi $at
+ lw $at, 116($sp)
+ nop
+ mtlo $at
+ lw $at, 0($sp)
+.set at
+ lw $v0, 4($sp)
+ lw $v1, 8($sp)
+ lw $a0, 12($sp)
+ lw $a1, 16($sp)
+ lw $a2, 20($sp)
+ lw $a3, 24($sp)
+ lw $t0, 28($sp)
+ lw $t1, 32($sp)
+ lw $t2, 36($sp)
+ lw $t3, 40($sp)
+ lw $t4, 44($sp)
+ lw $t5, 48($sp)
+ lw $t6, 52($sp)
+ lw $t7, 56($sp)
+ lw $s0, 60($sp)
+ lw $s1, 64($sp)
+ lw $s2, 68($sp)
+ lw $s3, 72($sp)
+ lw $s4, 76($sp)
+ lw $s5, 80($sp)
+ lw $s6, 84($sp)
+ lw $s7, 88($sp)
+ lw $t8, 92($sp)
+ lw $t9, 96($sp)
+ lw $gp, 100($sp)
+ lw $s8, 104($sp)
+ lw $ra, 108($sp)
+ addi $sp, 120
+ jr $ra
+ nop
+
+get_cop0_status:
+ mfc0 $v0, $12
+ jr $ra
+ nop
+
+set_cop0_status:
+ mtc0 $a0, $12
+ jr $ra
+ nop
+
+get_cop0_epc:
+ mfc0 $2, $14
+ jr $ra
+ nop
+
+run_bios:
+ j 0xbfc00000
+ nop
+
+is_load_delay_ok: + li $t2, 0 + li $t0, 0x0adecade + la $t1, isldo_data + .word 0x8d2a0000 #lw t2,0(t1) + beq $t0, $t2, load_delay_not_ok + nop +load_delay_ok: + li $v0, 1 + jr $ra + nop +load_delay_not_ok: + li $v0, 0 + jr $ra + nop +
+exit:
+ move $s0, $a0
+
+ la $a0, called_exit
+ move $a1, $s0
+
+ addiu $sp, $sp, -24
+ jal printf
+ nop
+ addiu $sp, $sp, 24
+
+ move $v0, $s0
+
+ j _real_exit
+ nop
+
+ .align 16
+ .data
+
+called_exit:
+ .string "Called exit(%d)\n"
+
+progtermfmt:
+ .string "Program terminated with return value %d\n"
+
+isldo_data:
+ .word 0x0adecade
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