zxspectrum: pascal startup code. this allows the RTL to be built with any assembler

git-svn-id: https://svn.freepascal.org/svn/fpc/trunk@45165 3ad0048d-3df7-0310-abae-a5850022a9f2

3 files changed, 144 insertions, 102 deletions

diff --git a/rtl/zxspectrum/Makefile b/rtl/zxspectrum/Makefile
index f79940ee48..d401015b79 100644
--- a/rtl/zxspectrum/Makefile
+++ b/rtl/zxspectrum/Makefile
@@ -365,301 +365,301 @@ ifdef NO_EXCEPTIONS_IN_SYSTEM
 override FPCOPT+=-dNO_EXCEPTIONS_IN_SYSTEM
 endif
 ifeq ($(FULL_TARGET),i386-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-go32v2)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-win32)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-os2)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-freebsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-beos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-haiku)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-netbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-solaris)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-netware)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-openbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-wdosx)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-darwin)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-emx)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-watcom)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-netwlibc)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-wince)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-symbian)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-nativent)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-iphonesim)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-android)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-aros)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),m68k-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),m68k-netbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),m68k-amiga)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),m68k-atari)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),m68k-palmos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),m68k-macos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),m68k-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-netbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-amiga)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-macos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-darwin)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-morphos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-wii)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc-aix)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),sparc-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),sparc-netbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),sparc-solaris)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),sparc-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-freebsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-haiku)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-netbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-solaris)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-openbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-darwin)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-win64)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-iphonesim)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-android)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-aros)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),x86_64-dragonfly)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-netbsd)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-palmos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-darwin)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-wince)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-gba)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-nds)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-symbian)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-android)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-aros)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),arm-freertos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc64-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc64-darwin)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc64-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),powerpc64-aix)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),avr-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),armeb-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),armeb-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),mips-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),mipsel-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),mipsel-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),mipsel-android)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),jvm-java)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),jvm-android)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i8086-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i8086-msdos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i8086-win16)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),aarch64-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),aarch64-darwin)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),aarch64-win64)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),aarch64-android)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),wasm-wasm)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),sparc64-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),riscv32-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),riscv32-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),riscv64-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),riscv64-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),xtensa-linux)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),xtensa-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),xtensa-freertos)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),z80-embedded)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),z80-zxspectrum)
-override TARGET_UNITS+=system
+override TARGET_UNITS+=system si_prc
 endif
 ifeq ($(FULL_TARGET),i386-linux)
 override TARGET_LOADERS+=prt0
@@ -2845,3 +2845,5 @@ prt0$(OEXT) : prt0.asm
 system$(PPUEXT) : system.pp $(SYSDEPS)
 	$(COMPILER) $(FPC_SYSTEM_OPT) -Us -Sg system.pp
 	$(EXECPPAS)
+si_prc$(PPUEXT) : system$(PPUEXT)
+	$(COMPILER) si_prc.pp
diff --git a/rtl/zxspectrum/Makefile.fpc b/rtl/zxspectrum/Makefile.fpc
index b0f615b339..f1fdabc1e3 100644
--- a/rtl/zxspectrum/Makefile.fpc
+++ b/rtl/zxspectrum/Makefile.fpc
@@ -5,7 +5,7 @@
 main=rtl
 [target]
 loaders=prt0
-units=system
+units=system si_prc
 
 [require]
 nortl=y
@@ -54,11 +54,14 @@ SYSDEPS=$(SYSINCDEPS) $(SYSCPUDEPS)
 #
 
 prt0$(OEXT) : prt0.asm
-	$(MAKE) $(COMPILER_UNITTARGETDIR)
+        $(MAKE) $(COMPILER_UNITTARGETDIR)
         sdcc-sdasz80 -o $(UNITTARGETDIRPREFIX)prt0$(OEXT) prt0.asm
 #
 # System Units (System, Objpas, Strings)
 #
 system$(PPUEXT) : system.pp $(SYSDEPS)
         $(COMPILER) $(FPC_SYSTEM_OPT) -Us -Sg system.pp
-	$(EXECPPAS)
+        $(EXECPPAS)
+
+si_prc$(PPUEXT) : system$(PPUEXT)
+        $(COMPILER) si_prc.pp
diff --git a/rtl/zxspectrum/si_prc.pp b/rtl/zxspectrum/si_prc.pp
new file mode 100644
index 0000000000..3a49731809
--- /dev/null
+++ b/rtl/zxspectrum/si_prc.pp
@@ -0,0 +1,37 @@
+{
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 2020 by Free Pascal development team
+
+    This file contains startup code for the ZX Spectrum
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}
+
+unit si_prc;
+
+interface
+
+implementation
+
+var
+  FPC_SAVE_IY: word; external name 'FPC_SAVE_IY';
+  fpc_stackarea_start: word; external name '__fpc_stackarea_start';
+  fpc_stackarea_end: word; external name '__fpc_stackarea_end';
+
+procedure PascalMain; external name 'PASCALMAIN';
+
+{ this *must* always remain the first procedure with code in this unit }
+procedure _start; assembler; nostackframe; public name '_start';
+asm
+    ld sp, fpc_stackarea_end
+    ld (FPC_SAVE_IY), iy
+    jp PASCALMAIN
+end;
+
+end.