From: John Tsiombikas <nuclear@member.fsf.org>
Date: Mon, 12 Apr 2021 04:11:02 +0000 (+0300)
Subject: iwram_brk/iwram_sbrk
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=gbajam21;a=commitdiff_plain;h=c8c1b9ddb5ed3e256b086bd0db92589948163e93

iwram_brk/iwram_sbrk
---

diff --git a/src/asmutil.s b/src/asmutil.s
index 3aa2255..b88a7a1 100644
--- a/src/asmutil.s
+++ b/src/asmutil.s
@@ -19,6 +19,10 @@ get_pc:
 	mov r0, lr
 	bx lr
 
+	.globl get_sp
+get_sp:
+	mov r0, sp
+	bx lr
 
 	.arm
 	.extern panic_regs
diff --git a/src/debug.c b/src/debug.c
index 60dc387..9fd40d3 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -39,7 +39,7 @@ void vblperf_stop(void)
 uint32_t panic_regs[16];
 void get_panic_regs(void);
 
-void panic(uint32_t pc, const char *fmt, ...)
+void panic(void *pc, const char *fmt, ...)
 {
 	int y;
 	va_list ap;
@@ -56,7 +56,7 @@ void panic(uint32_t pc, const char *fmt, ...)
 	fillblock_16byte((void*)VRAM_LFB_FB0_ADDR, 0, 240 * 160 / 16);
 
 	fillblock_16byte((unsigned char*)VRAM_LFB_FB0_ADDR + 240 * 3, 0xffffffff, 240 / 16);
-	dbg_drawstr(44, 0, " Panic at %08x ", pc);
+	dbg_drawstr(44, 0, " Panic at %p ", pc);
 
 	va_start(ap, fmt);
 	y = dbg_vdrawstr(0, 12, fmt, ap) + 8;
diff --git a/src/debug.h b/src/debug.h
index 844b465..5715da8 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -25,7 +25,7 @@ void vblperf_stop(void);
 	} while(0)
 
 
-void panic(uint32_t pc, const char *fmt, ...);
+void panic(void *pc, const char *fmt, ...) __attribute__((noreturn));
 
 void dbg_drawglyph(int x, int y, int c);
 int dbg_drawstr(int x, int y, const char *fmt, ...);
diff --git a/src/gamescr.c b/src/gamescr.c
index e5dd8e4..3941883 100644
--- a/src/gamescr.c
+++ b/src/gamescr.c
@@ -7,7 +7,7 @@
 #include "intr.h"
 #include "debug.h"
 
-static unsigned char tex[32 * 32] __attribute__((section(".iwram")));
+static unsigned char *tex;//[32 * 32] __attribute__((section(".iwram")));
 
 void gamescr(void)
 {
@@ -31,6 +31,7 @@ void gamescr(void)
 	fillblock_16byte(vram[0], 0xffffffff, 240 * 160 / 16);
 	fillblock_16byte(vram[1], 0xffffffff, 240 * 160 / 16);
 
+	tex = iwram_sbrk(32 * 32);
 	memcpy(tex, tuncross_pixels, 32 * 32);
 
 	nframes = 0;
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..c52e8af
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,25 @@
+#include "util.h"
+#include "debug.h"
+
+extern char __data_end__;
+static char *top = &__data_end__;
+
+int iwram_brk(void *addr)
+{
+	if(addr < &__data_end__) {
+		addr = &__data_end__;
+	}
+	if(addr > get_sp()) {
+		/*return -1;*/
+		panic(get_pc(), "iwram_brk (%p) >= sp", addr);
+	}
+	top = addr;
+	return 0;
+}
+
+void *iwram_sbrk(intptr_t delta)
+{
+	void *prev = top;
+	iwram_brk(top + delta);
+	return prev;
+}
diff --git a/src/util.h b/src/util.h
index bba0ac8..d374aef 100644
--- a/src/util.h
+++ b/src/util.h
@@ -1,6 +1,8 @@
 #ifndef UTIL_H_
 #define UTIL_H_
 
+#include <stdint.h>
+
 #define wait_vblank() \
 	do { \
 		while(REG_DISPSTAT & DISPSTAT_VBLANK); \
@@ -18,9 +20,12 @@
 		((uint16_t*)CRAM_BG_ADDR)[idx] = (uint16_t)(r) | ((uint16_t)(g) << 5) | ((uint16_t)(b) << 10); \
 	} while(0)
 
+int iwram_brk(void *addr);
+void *iwram_sbrk(intptr_t delta);
 
 void fillblock_16byte(void *dest, uint32_t val, int count);
 
-uint32_t get_pc(void);
+void *get_pc(void);
+void *get_sp(void);
 
 #endif	/* UTIL_H_ */