From: Alan Cox <alan@linux.intel.com>
Date: Sun, 8 Mar 2015 21:16:32 +0000 (+0000)
Subject: zx128: Add syscall entry point
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=5943622131b3cbaf2a909dd3acbf6fad4f3ca25d;p=FUZIX.git

zx128: Add syscall entry point

This needs some further thought. If we are going to support relocatable
binaries we will need some way to fix up the syscall entry point on them.
---

diff --git a/Kernel/platform-zx128/zx128.s b/Kernel/platform-zx128/zx128.s
index d7297c48..6ea88fe5 100644
--- a/Kernel/platform-zx128/zx128.s
+++ b/Kernel/platform-zx128/zx128.s
@@ -10,6 +10,7 @@
         .globl _program_vectors
         .globl platform_interrupt_all
 	.globl interrupt_handler
+	.globl unix_syscall_entry
 
         .globl map_kernel
         .globl map_process
@@ -159,9 +160,12 @@ setvectors:
 	ld a, #0x18
 	ld (0xffff), a		;	JR (plus ROM at 0 gives JR $FFF4)
 	ld a, #0xC3		;	JP
-	ld (0xFFF4), a
+	ld (0xFFF4), a		;	FFF4-6 are the interrupt vector
+	ld (0xFFF7), a		;	FFF7-9 are syscall
 	ld hl, #interrupt_handler
 	ld (0xFFF5), hl		;	to IRQ handler
+	ld hl, #unix_syscall_entry
+	ld (0xFFF8), hl		;	system calls (can't use RST on this box)
 	call map_restore
 	ret