Initial commit to 'Modern C Template For PDP-11' repository.

diff --git a/LICENSE.txt b/LICENSE.txt
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+++ b/LICENSE.txt
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+MIT/X Consortium License
+
+© 2020 Aaron Taylor <ataylor at subgeniuskitty dot com>
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

diff --git a/Makefile b/Makefile
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+#############################################################
+# (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com> #
+# See LICENSE.txt file for copyright and license details.   #
+#############################################################
+
+
+####################################################################################################
+# GNU Executables & Flags
+
+CC              = pdp11-aout-gcc
+LD              = pdp11-aout-ld
+AS              = pdp11-aout-as
+OC              = pdp11-aout-objcopy
+OD              = pdp11-aout-objdump
+
+CC_FLAGS        = -c -Wall -Wno-unused-function -O0 -ffreestanding -fomit-frame-pointer -fno-builtin-alloca -std=c99
+LD_FLAGS        = -T pdp11.ld --entry _start
+AS_FLAGS        = 
+OC_FLAGS        = --only-section=.text --output-target binary
+
+
+####################################################################################################
+# Misc Configuration
+
+# Physical serial port connected to a PDP-11 for transfering program into memory.
+SERIAL_PORT     = /dev/cuau0
+
+# Commands for converting raw binary into SIMH or real PDP compatible formats.
+SIM_LOAD        = bin2load
+PDP_LOAD        = bin2pdp
+
+# Commands for running the SIMH PDP-11 simulation.
+SIMH_CMD        = pdp11
+SIMH_CFG        = simh.conf
+
+# List of all source files in PDP-11 library.
+PDPLIB_SRC      != ls pdp11/*.c
+
+
+####################################################################################################
+# Targets
+
+all: aout
+
+aout: 
+       $(AS) $(AS_FLAGS) -o init.o init.s
+       $(CC) $(CC_FLAGS) -o pdp11.o $(PDPLIB_SRC)
+
+       ##############################################
+       # Insert your program's build commands here. #
+       $(CC) $(CC_FLAGS) -o hello.o hello.c
+       ##############################################
+
+       $(LD) $(LD_FLAGS) init.o pdp11.o hello.o -o program.out
+
+clean:
+       @rm -rf *.o *.out *.pdp11 *.bin *.core
+
+sim: aout
+       $(OC) $(OC_FLAGS) program.out program.bin
+       $(SIM_LOAD) -i program.bin -o program.pdp11 -a 01000
+       $(SIMH_CMD) $(SIMH_CFG)
+
+pdp: aout
+       $(OC) $(OC_FLAGS) program.out program.bin
+       $(PDP_LOAD) -i program.bin -o $(SERIAL_PORT)
+
+examine: aout
+       @$(OD) -d program.out

diff --git a/hello.c b/hello.c
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+++ b/hello.c
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+/* (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com>   */
+/* See LICENSE.txt file for copyright and license details.     */
+
+#include "pdp11/pdp11.h"
+
+void
+hello(void)
+{
+    wait(01000);
+    putch('H');
+    putch('e');
+    putch('l');
+    putch('l');
+    putch('o');
+    putch(',');
+    putch(' ');
+    putch('W');
+    putch('o');
+    putch('r');
+    putch('l');
+    putch('d');
+    putch('!');
+    putch('\n');
+}

diff --git a/init.s b/init.s
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+++ b/init.s
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+# (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com>
+# See LICENSE.txt file for copyright and license details.
+
+.globl _start
+
+_start:
+    mov $01000,sp
+    jsr pc,_hello
+    halt

diff --git a/pdp11.ld b/pdp11.ld
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+++ b/pdp11.ld
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+OUTPUT_FORMAT("a.out-pdp11")
+ENTRY(start)
+phys = 00001000;
+SECTIONS
+{
+  .text phys : AT(phys) {
+    code = .;
+    *(.text)
+    *(.rodata)
+    . = ALIGN(0100);
+  }
+  .data : AT(phys + (data - code))
+  {
+    data = .;
+    *(.data)
+    . = ALIGN(0100);
+  }
+  .bss : AT(phys + (bss - code))
+  {
+    bss = .;
+    *(.bss)
+    . = ALIGN(0100);
+  }
+  end = .;
+}

diff --git a/pdp11/pdp11.c b/pdp11/pdp11.c
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+++ b/pdp11/pdp11.c
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+/* (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com>   */
+/* See LICENSE.txt file for copyright and license details.     */
+
+#include <stdint.h>
+
+/*
+ * Polled console I/O
+ */
+
+#define RCSR (*((volatile uint16_t *)0177560))
+#define RBUF (*((volatile uint16_t *)0177562))
+#define XCSR (*((volatile uint16_t *)0177564))
+#define XBUF (*((volatile uint16_t *)0177566))
+
+void
+putch(uint16_t c)
+{
+    while((XCSR && 0200) == 0) continue;
+    XBUF = c;
+}
+
+uint16_t
+getch(void)
+{
+    while((RCSR && 0200) == 0) continue;
+    return RBUF;
+}
+
+/*
+ * Busy-loop
+ */
+
+void
+wait(uint16_t count)
+{
+    while (count--) continue;
+}

diff --git a/pdp11/pdp11.h b/pdp11/pdp11.h
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+++ b/pdp11/pdp11.h
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+/* (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com>   */
+/* See LICENSE.txt file for copyright and license details.     */
+
+#ifndef SGK_PDP11_H
+#define SGK_PDP11_H
+
+#include <stdint.h>
+
+void putch(uint16_t);
+uint16_t getch(void);
+void wait(uint16_t);
+
+#endif /* SGK_PDP11_H */

diff --git a/simh.conf b/simh.conf
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+set cpu 11/73
+set cpu 4M
+
+; Optional line printer
+; att lpt printer.txt
+
+; Eight terminal lines accessible via telnet to port 1170.
+; set dci en
+; set dci lines=8
+; att dci 1170
+
+load program.pdp11
+go 1000