Add "self", example of building uvm32 to run inside uvm32

mandelbrot app is embedded in host-mini, which is then compiled to a .bin

README.md

@@ -24,6 +24,7 @@ Although based on a fully fledged CPU emulator, uvm32 is intended for executing
  * [apps/lissajous](apps/lissajous) C console lissajous curve (showing softfp, floating point)
  * [apps/hello-asm](apps/hello-asm) Minimal hello world assembly
  * [apps/fib](apps/fib) C fibonacci series program (iterative and recursive)
+ * [apps/self](apps/self) host-mini with embedded mandelbrot generation program, compiled as an app (inception!)
  * [apps/sketch](apps/sketch) C Arduino/Wiring/Processing type program in `setup()` and `loop()` style
  * [apps/rust-hello](apps/rust-hello) Rust hello world program (note, the version of rust installed by brew on mac has issues, use the official rust installer from https://rust-lang.org/learn/get-started/)
  * [apps/zig-mandel](apps/zig-mandel) Zig ASCII mandelbrot generator program

apps/Makefile

@@ -6,6 +6,7 @@ all:
 	(cd helloworld && make)
 	(cd lissajous && make)
 	(cd conio && make)
+	(cd self && make)
 	(cd zig-mandel && make)
 	(cd zigtris && make)
 	(cd rust-hello && make)
@@ -16,6 +17,7 @@ clean:
 	(cd helloworld && make clean)
 	(cd lissajous && make clean)
 	(cd conio && make clean)
+	(cd self && make clean)
 	(cd zig-mandel && make clean)
 	(cd zigtris && make clean)
 	(cd rust-hello && make clean)

apps/self/Makefile

@@ -0,0 +1,27 @@
+PROJECT:=self
+
+DOCKER_IMAGE=riscv-dev
+DOCKER_CMD:=docker run --rm -v ${PWD}../../../:/data -w /data/apps/${PROJECT} ${DOCKER_IMAGE}
+PREFIX:=${DOCKER_CMD} riscv64-unknown-elf-
+CFLAGS+=-I../../common -I../../uvm32 -DUVM32_MEMORY_SIZE=8192
+CFLAGS+=-fno-stack-protector
+CFLAGS+=-static-libgcc -fdata-sections -ffunction-sections
+CFLAGS+=-g -Os -march=rv32ima_zicsr -mabi=ilp32 -static
+LDFLAGS:= -T ../linker.ld -nostdlib -Wl,--gc-sections
+LIBS:= #-lgcc # needed for softfp
+
+SRCS=${PROJECT}.c ../../uvm32/uvm32.c ../crt0.S
+
+all:
+	${PREFIX}gcc -o ${PROJECT}.elf ${CFLAGS} ${LDFLAGS} ${SRCS} ${LIBS}
+	$(PREFIX)objcopy ${PROJECT}.elf -O binary ${PROJECT}.bin
+
+disasm: all
+	$(PREFIX)objdump -S -d -f ${PROJECT}.elf
+
+test: all
+	../../host/host ${PWD}/${PROJECT}.bin
+
+clean:
+	rm -f ${PROJECT}.o ${PROJECT}.elf ${PROJECT}.bin
+

apps/self/self.c

@@ -0,0 +1,80 @@
+#define USE_MAIN
+#include "uvm32_target.h"
+
+#include "uvm32.h"
+#include "../common/uvm32_common_custom.h"
+
+// Precompiled binary program to print integers
+// This code expects to print via syscall 0x13C (UVM32_SYSCALL_PRINTD in common/uvm32_common_custom.h)
+uint8_t rom[] = {
+  0x23, 0x26, 0x11, 0x00, 0xef, 0x00, 0xc0, 0x00, 0xb7, 0x08, 0x00, 0x01,
+  0x73, 0x00, 0x00, 0x00, 0x37, 0xf5, 0xff, 0xff, 0xb7, 0x15, 0x00, 0x00,
+  0x37, 0xe6, 0xff, 0xff, 0x13, 0x07, 0xf0, 0x01, 0xb7, 0x47, 0x00, 0x00,
+  0xb7, 0x06, 0x00, 0x01, 0x13, 0x08, 0xd5, 0xcc, 0x93, 0x82, 0x35, 0x33,
+  0x13, 0x03, 0x76, 0xe6, 0x93, 0x83, 0x35, 0xb3, 0x13, 0x86, 0x16, 0x00,
+  0x63, 0xc8, 0x02, 0x09, 0x13, 0x0e, 0x03, 0x00, 0x63, 0xca, 0x63, 0x06,
+  0x93, 0x0e, 0x00, 0x00, 0x93, 0x05, 0x00, 0x00, 0x13, 0x0f, 0x00, 0x00,
+  0x93, 0x0f, 0x00, 0x00, 0x93, 0x06, 0x00, 0x02, 0x13, 0x85, 0x06, 0xfe,
+  0x63, 0x62, 0xa7, 0x04, 0x33, 0x85, 0xd5, 0x01, 0x63, 0xee, 0xa7, 0x02,
+  0x13, 0x05, 0x00, 0x00, 0x93, 0x08, 0x06, 0x00, 0x33, 0x8f, 0xef, 0x03,
+  0xb3, 0x8f, 0xd5, 0x41, 0x73, 0x00, 0x00, 0x00, 0x13, 0x5f, 0xbf, 0x40,
+  0xb3, 0x8f, 0xcf, 0x01, 0x33, 0x0f, 0x0f, 0x01, 0xb3, 0x85, 0xff, 0x03,
+  0x93, 0xd5, 0xc5, 0x00, 0x33, 0x05, 0xef, 0x03, 0x93, 0x5e, 0xc5, 0x00,
+  0x93, 0x86, 0x16, 0x00, 0x6f, 0xf0, 0xdf, 0xfb, 0x13, 0x85, 0x06, 0x00,
+  0x93, 0x08, 0x00, 0x00, 0x73, 0x00, 0x00, 0x00, 0x13, 0x0e, 0x1e, 0x09,
+  0xe3, 0xda, 0xc3, 0xf9, 0x13, 0x05, 0xa0, 0x00, 0x93, 0x08, 0x00, 0x00,
+  0x73, 0x00, 0x00, 0x00, 0x13, 0x08, 0x98, 0x19, 0xe3, 0xdc, 0x02, 0xf7,
+  0x37, 0x05, 0x00, 0x80, 0x13, 0x05, 0x05, 0x0e, 0x93, 0x08, 0x30, 0x00,
+  0x73, 0x00, 0x00, 0x00, 0x67, 0x80, 0x00, 0x00, 0x48, 0x65, 0x6c, 0x6c,
+  0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x00
+};
+
+// Create an identifier for our host handler
+// syscalls exposed to vm environement
+typedef enum {
+    F_PUTC,
+    F_PRINTLN,
+} f_code_t;
+
+// Map exposed syscalls to syscalls
+const uvm32_mapping_t env[] = {
+    { .syscall = UVM32_SYSCALL_PRINTLN, .typ = UVM32_SYSCALL_TYP_BUF_TERMINATED_WR, .code = F_PRINTLN },
+    { .syscall = UVM32_SYSCALL_PUTC, .typ = UVM32_SYSCALL_TYP_U32_WR, .code = F_PUTC },
+};
+
+void main(void) {
+    uvm32_state_t vmst;
+    uvm32_evt_t evt;
+    bool isrunning = true;
+
+    uvm32_init(&vmst, env, sizeof(env) / sizeof(env[0]));
+    uvm32_load(&vmst, rom, sizeof(rom));
+
+    while(isrunning) {
+        uvm32_run(&vmst, &evt, 100);   // num instructions before vm considered hung
+
+        switch(evt.typ) {
+            case UVM32_EVT_END:
+                isrunning = false;
+            break;
+            case UVM32_EVT_SYSCALL:    // vm has paused to handle UVM32_SYSCALL
+                switch((f_code_t)evt.data.syscall.code) {
+                    case F_PUTC:
+                        putc(evt.data.syscall.val.u32);
+                    break;
+                    case F_PRINTLN:
+                        for (int i=0;i<evt.data.syscall.val.buf.len;i++) {
+                            putc(evt.data.syscall.val.buf.ptr[i]);
+                        }
+                        putc('\n');
+                    break;
+                }
+            break;
+            case UVM32_EVT_ERR:
+                println(evt.data.err.errstr);
+            break;
+            default:
+            break;
+        }
+    }
+}