zasm emul: bring back kernel/user distinction
It was a bad idea to remove it. Now that I'm introducing the concept of a per-app glue file, it becomes much easier to build emulated zasm as a userspace app.
This commit is contained in:
Virgil Dupras
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7fad3b0c90
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bc1496a7e3
1
.gitignore
vendored
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1
.gitignore
vendored
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@ -0,0 +1 @@
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/kernel/user.h
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62
apps/zasm/glue.asm
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62
apps/zasm/glue.asm
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@ -0,0 +1,62 @@
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; zasm
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;
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; Reads input from specified blkdev ID, assemble the binary in two passes and
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; spit the result in another specified blkdev ID.
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;
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; We don't buffer the whole source in memory, so we need our input blkdev to
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; support Seek so we can read the file a second time. So, for input, we need
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; GetC and Seek.
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;
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; For output, we only need PutC. Output doesn't start until the second pass.
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;
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; The goal of the second pass is to assign values to all symbols so that we
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; can have forward references (instructions referencing a label that happens
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; later).
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;
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; Labels and constants are both treated the same way, that is, they can be
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; forward-referenced in instructions. ".equ" directives, however, are evaluated
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; during the first pass so forward references are not allowed.
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;
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; *** Requirements ***
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; blockdev
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; strncmp
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; addDE
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; addHL
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; upcase
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; unsetZ
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; intoDE
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; intoHL
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; writeHLinDE
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; findchar
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; parseHex
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; parseHexPair
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; blkSel
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; fsFindFN
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; fsOpen
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; fsGetC
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; fsSeek
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; fsTell
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; FS_HANDLE_SIZE
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; *** Variables ***
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#include "user.h"
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.org USER_CODE
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jp zasmMain
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#include "zasm/util.asm"
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.equ IO_RAMSTART USER_RAMSTART
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#include "zasm/io.asm"
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.equ TOK_RAMSTART IO_RAMEND
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#include "zasm/tok.asm"
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#include "zasm/parse.asm"
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#include "zasm/expr.asm"
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#include "zasm/instr.asm"
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.equ DIREC_RAMSTART TOK_RAMEND
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#include "zasm/directive.asm"
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.equ SYM_RAMSTART DIREC_RAMEND
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#include "zasm/symbol.asm"
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.equ ZASM_RAMSTART SYM_RAMEND
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#include "zasm/main.asm"
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@ -1,44 +1,3 @@
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; zasm
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;
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; Reads input from specified blkdev ID, assemble the binary in two passes and
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; spit the result in another specified blkdev ID.
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;
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; We don't buffer the whole source in memory, so we need our input blkdev to
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; support Seek so we can read the file a second time. So, for input, we need
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; GetC and Seek.
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;
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; For output, we only need PutC. Output doesn't start until the second pass.
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;
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; The goal of the second pass is to assign values to all symbols so that we
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; can have forward references (instructions referencing a label that happens
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; later).
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;
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; Labels and constants are both treated the same way, that is, they can be
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; forward-referenced in instructions. ".equ" directives, however, are evaluated
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; during the first pass so forward references are not allowed.
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;
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; *** Requirements ***
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; blockdev
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; strncmp
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; addDE
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; addHL
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; upcase
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; unsetZ
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; intoDE
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; intoHL
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; writeHLinDE
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; findchar
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; parseHex
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; parseHexPair
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; blkSel
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; fsFindFN
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; fsOpen
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; fsGetC
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; fsSeek
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; fsTell
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; ZASM_RAMSTART (where we put our variables in RAM)
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; FS_HANDLE_SIZE
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; *** Variables ***
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; A bool flag indicating that we're on first pass. When we are, we don't care
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@ -54,19 +13,6 @@
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.equ ZASM_CTX_PC ZASM_LOCAL_PASS+1
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.equ ZASM_RAMEND ZASM_CTX_PC+2
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#include "zasm/util.asm"
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.equ IO_RAMSTART ZASM_RAMEND
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#include "zasm/io.asm"
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.equ TOK_RAMSTART IO_RAMEND
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#include "zasm/tok.asm"
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#include "zasm/parse.asm"
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#include "zasm/expr.asm"
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#include "zasm/instr.asm"
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.equ DIREC_RAMSTART TOK_RAMEND
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#include "zasm/directive.asm"
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.equ SYM_RAMSTART DIREC_RAMEND
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#include "zasm/symbol.asm"
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; Read file through blockdev ID in H and outputs its upcodes through blockdev
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; ID in L.
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zasmMain:
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7
kernel/user.h.example
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7
kernel/user.h.example
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@ -0,0 +1,7 @@
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; Example include file for userspace program
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; All userspace programs include this file in they main source file so that
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; they know a couple of vital things about the system such as where user memory
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; starts. This is an example file with required constants.
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.equ USER_CODE 0x4800 ; Where in memory user code is loaded
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.equ USER_RAMSTART 0x8800 ; Where in memory user memory begins
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@ -11,14 +11,19 @@ all: $(TARGETS)
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shell/kernel.h: shell/shell_.asm
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zasm/kernel.h: zasm/glue.asm
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$(KERNEL_HEADERS):
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scas -o - -I $(KERNEL) -I $(APPS) $< | ./bin2c.sh KERNEL | tee $@ > /dev/null
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scas -o - -I $(KERNEL) $< | ./bin2c.sh KERNEL | tee $@ > /dev/null
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zasm/user.h: $(APPS)/zasm/glue.asm
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$(USER_HEADERS):
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scas -o - -I $(APPS) $< | ./bin2c.sh USERSPACE | tee $@ > /dev/null
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zasm/includes.cfs: $(CFSPACK)
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rm -rf zasm/includes
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cp -r $(KERNEL) zasm/includes
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cp -r $(APPS)/zasm zasm/includes/zasm
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find zasm/includes -name *.md -delete
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find zasm/includes -name *.md -o -name *.example -delete
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find zasm/includes -type f -exec sed -i -e 's/;.*//g' {} \;
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cp user.h zasm/includes
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$(CFSPACK) zasm/includes > $@
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rm -rf zasm/includes
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@ -26,7 +31,7 @@ zasm/includes.h: zasm/includes.cfs
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./bin2c.sh FSDEV < $< | tee $@ > /dev/null
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shell/shell: shell/shell.c libz80/libz80.o shell/kernel.h $(CFSPACK)
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zasm/zasm: zasm/zasm.c libz80/libz80.o zasm/kernel.h zasm/includes.h
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zasm/zasm: zasm/zasm.c libz80/libz80.o zasm/kernel.h zasm/user.h zasm/includes.h
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runbin/runbin: runbin/runbin.c libz80/libz80.o
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$(TARGETS):
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cc $< libz80/libz80.o -o $@
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22
tools/emul/user.h
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22
tools/emul/user.h
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@ -0,0 +1,22 @@
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.equ USER_CODE 0x4800
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.equ USER_RAMSTART 0x5800
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.equ FS_HANDLE_SIZE 8
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; *** JUMP TABLE ***
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.equ strncmp 0x03
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.equ addDE 0x06
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.equ addHL 0x09
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.equ upcase 0x0c
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.equ unsetZ 0x0f
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.equ intoDE 0x12
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.equ intoHL 0x15
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.equ writeHLinDE 0x18
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.equ findchar 0x1b
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.equ parseHex 0x1e
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.equ parseHexPair 0x21
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.equ blkSel 0x24
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.equ fsFindFN 0x27
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.equ fsOpen 0x2a
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.equ fsGetC 0x2d
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.equ fsSeek 0x30
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.equ fsTell 0x33
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@ -6,7 +6,25 @@
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.equ FS_SEEK_PORT 0x03
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.equ STDERR_PORT 0x04
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jp init
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jp init ; 3 bytes
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; *** JUMP TABLE ***
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jp strncmp
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jp addDE
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jp addHL
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jp upcase
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jp unsetZ
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jp intoDE
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jp intoHL
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jp writeHLinDE
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jp findchar
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jp parseHex
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jp parseHexPair
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jp blkSel
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jp fsFindFN
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jp fsOpen
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jp fsGetC
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jp fsSeek
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jp fsTell
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#include "core.asm"
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#include "parse.asm"
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@ -21,8 +39,7 @@ jp init
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.equ FS_RAMSTART BLOCKDEV_RAMEND
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.equ FS_HANDLE_COUNT 0
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#include "fs.asm"
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.equ ZASM_RAMSTART FS_RAMEND
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#include "zasm/main.asm"
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#include "user.h"
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init:
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di
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@ -34,7 +51,7 @@ init:
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call fsOn
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ld h, 0 ; input blkdev
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ld l, 1 ; output blkdev
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call zasmMain
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call USER_CODE
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; signal the emulator we're done
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halt
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@ -2,6 +2,7 @@
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#include <stdio.h>
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#include "../libz80/z80.h"
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#include "kernel.h"
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#include "user.h"
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#include "includes.h"
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/* zasm reads from a specified blkdev, assemble the file and writes the result
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@ -25,6 +26,7 @@
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*/
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// in sync with zasm_glue.asm
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#define USER_CODE 0x4800
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#define STDIO_PORT 0x00
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#define STDIN_SEEK_PORT 0x01
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#define FS_DATA_PORT 0x02
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@ -150,6 +152,9 @@ int main()
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for (int i=0; i<sizeof(KERNEL); i++) {
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mem[i] = KERNEL[i];
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}
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for (int i=0; i<sizeof(USERSPACE); i++) {
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mem[i+USER_CODE] = USERSPACE[i];
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}
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for (int i=0; i<sizeof(FSDEV); i++) {
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fsdev[i] = FSDEV[i];
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}
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@ -1,21 +1,28 @@
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.equ RAMSTART 0x4000
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.equ ZASM_FIRST_PASS RAMSTART
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.equ ZASM_LOCAL_PASS ZASM_FIRST_PASS+1
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.equ ZASM_CTX_PC ZASM_LOCAL_PASS+1
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.equ ZASM_RAMEND ZASM_CTX_PC+2
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.equ USER_CODE 0x4800
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.equ USER_RAMSTART 0x5800
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.equ FS_HANDLE_SIZE 8
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#include "core.asm"
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#include "parse.asm"
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.equ BLOCKDEV_RAMSTART ZASM_RAMEND
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.equ BLOCKDEV_COUNT 0
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#include "blockdev.asm"
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.equ FS_RAMSTART BLOCKDEV_RAMEND
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.equ FS_HANDLE_COUNT 0
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#include "fs.asm"
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; *** JUMP TABLE ***
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.equ strncmp 0x03
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.equ addDE 0x06
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.equ addHL 0x09
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.equ upcase 0x0c
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.equ unsetZ 0x0f
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.equ intoDE 0x12
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.equ intoHL 0x15
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.equ writeHLinDE 0x18
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.equ findchar 0x1b
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.equ parseHex 0x1e
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.equ parseHexPair 0x21
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.equ blkSel 0x24
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.equ fsFindFN 0x27
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.equ fsOpen 0x2a
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.equ fsGetC 0x2d
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.equ fsSeek 0x30
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.equ fsTell 0x33
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#include "zasm/util.asm"
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.equ IO_RAMSTART ZASM_RAMEND
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.equ IO_RAMSTART USER_RAMSTART
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#include "zasm/io.asm"
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.equ SYM_RAMSTART IO_RAMEND
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#include "zasm/symbol.asm"
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