From f7d9c309661f3027d5bfd119b3daf814e26ef589 Mon Sep 17 00:00:00 2001
From: spicyjpeg <thatspicyjpeg@gmail.com>
Date: Tue, 4 Apr 2023 01:14:36 +0200
Subject: Add PCDRV API, fix warnings and DS region misdetection

---
 libpsn00b/psxapi/_syscalls.s | 111 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 105 insertions(+), 6 deletions(-)

(limited to 'libpsn00b/psxapi/_syscalls.s')

diff --git a/libpsn00b/psxapi/_syscalls.s b/libpsn00b/psxapi/_syscalls.s
index 6eaed72..5062b15 100644
--- a/libpsn00b/psxapi/_syscalls.s
+++ b/libpsn00b/psxapi/_syscalls.s
@@ -1,26 +1,28 @@
 # PSn00bSDK syscall wrappers
-# (C) 2022 spicyjpeg - MPL licensed
+# (C) 2022-2023 spicyjpeg - MPL licensed
 
 .set noreorder
 
+## Interrupt enable/disable
+
 .section .text.EnterCriticalSection
 .global EnterCriticalSection
 .type EnterCriticalSection, @function
 EnterCriticalSection:
-	li $a0, 0x01
+	li  $a0, 0x01
 	syscall 0
 
-	jr $ra
+	jr  $ra
 	nop
 
 .section .text.ExitCriticalSection
 .global ExitCriticalSection
 .type ExitCriticalSection, @function
 ExitCriticalSection:
-	li $a0, 0x02
+	li  $a0, 0x02
 	syscall 0
 
-	jr $ra
+	jr  $ra
 	nop
 
 .section .text.SwEnterCriticalSection
@@ -31,7 +33,7 @@ SwEnterCriticalSection:
 	li    $a1, -1026
 	and   $a1, $a0
 	mtc0  $a1, $12
-	andi  $a0, 0x0401 # return ((cop0r12_prev & 0x401) == 0x401)
+	andi  $a0, 0x0401 # return !((cop0r12_prev & 0x401) < 0x401)
 	sltiu $v0, $a0, 0x0401
 
 	jr    $ra
@@ -49,3 +51,100 @@ SwExitCriticalSection:
 
 	jr   $ra
 	nop
+
+## PCDRV (host file access) API
+
+.section .text.PCinit
+.global PCinit
+.type PCinit, @function
+PCinit:
+	break 0, 0x101 # () -> error
+
+	jr    $ra
+	nop
+
+.section .text.PCcreat
+.global PCcreat
+.type PCcreat, @function
+PCcreat:
+	li    $a2, 0
+	move  $a1, $a0
+	break 0, 0x102 # (path, path, 0) -> error, fd
+
+	bgez  $v0, .Lcreate_ok # if (error < 0) fd = error
+	nop
+	move  $v1, $v0
+.Lcreate_ok:
+	jr    $ra # return fd
+	move  $v0, $v1
+
+.section .text.PCopen
+.global PCopen
+.type PCopen, @function
+PCopen:
+	move  $a2, $a1
+	move  $a1, $a0
+	break 0, 0x103 # (path, path, mode) -> error, fd
+
+	bgez  $v0, .Lopen_ok # if (error < 0) fd = error
+	nop
+	move  $v1, $v0
+.Lopen_ok:
+	jr    $ra # return fd
+	move  $v0, $v1
+
+.section .text.PCclose
+.global PCclose
+.type PCclose, @function
+PCclose:
+	move  $a1, $a0
+	break 0, 0x104 # (fd, fd) -> error
+
+	jr    $ra
+	nop
+
+.section .text.PCread
+.global PCread
+.type PCread, @function
+PCread:
+	move  $a3, $a1
+	move  $a1, $a0
+	break 0, 0x105 # (fd, fd, length, data) -> error, length
+
+	bgez  $v0, .Lread_ok # if (error < 0) length = error
+	nop
+	move  $v1, $v0
+.Lread_ok:
+	jr    $ra # return length
+	move  $v0, $v1
+
+.section .text.PCwrite
+.global PCwrite
+.type PCwrite, @function
+PCwrite:
+	move  $a3, $a1
+	move  $a1, $a0
+	break 0, 0x106 # (fd, fd, length, data) -> error, length
+
+	bgez  $v0, .Lwrite_ok # if (error < 0) length = error
+	nop
+	move  $v1, $v0
+.Lwrite_ok:
+	jr    $ra # return length
+	move  $v0, $v1
+
+.section .text.PClseek
+.global PClseek
+.type PClseek, @function
+PClseek:
+	move  $a3, $a2
+	move  $a2, $a1
+	move  $a1, $a0
+	break 0, 0x107 # (fd, fd, offset, mode) -> error, offset
+
+	bgez  $v0, .Lseek_ok # if (error < 0) offset = error
+	nop
+	move  $v1, $v0
+.Lseek_ok:
+	jr    $ra # return offset
+	move  $v0, $v1
-- 
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