wip

README

@@ -51,4 +51,16 @@ code to jump into a C program and go from there.  The blinker directory
 (in this project) is perhaps a place to use as a beginning point on an
 embedded program.
 
+Google
+  ARM DDI 0100E
+or
+  ARM DDI 0100I
+
+https://www.scss.tcd.ie/~waldroj/3d1/arm_arm.pdf
+http://morrow.ece.wisc.edu/ECE353/arm_reference/ddi0100e_arm_arm.pdf
+http://reds.heig-vd.ch/share/cours/aro/ARM_Thumb_instructions.pdf
+They have a rev B here...Which was the blue covered one in print.
+http://www.home.marutan.net/arcemdocs/
+https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/third-party/archives/ddi0100e_arm_arm.pdf
+https://www.cs.miami.edu/~burt/learning/Csc521.141/Documents/arm_arm.pdf
 

new_one/nothumb2/Makefile

@@ -0,0 +1,24 @@
+
+#ARMGNU ?= arm-none-eabi
+ARMGNU ?= arm-linux-gnueabi
+
+XCPU = -mcpu=cortex-m0
+
+AOPS = --warn --fatal-warnings $(XCPU)
+LOPS = -nostdlib -nostartfiles
+
+all : notmain.bin
+
+clean:
+	rm -f *.bin
+	rm -f *.o
+	rm -f *.elf
+	rm -f *.list
+
+flash.o : flash.s
+	$(ARMGNU)-as $(AOPS) flash.s -o flash.o
+
+notmain.bin :               flash.ld flash.o
+	$(ARMGNU)-ld $(LOPS) -T flash.ld flash.o -o notmain.elf
+	$(ARMGNU)-objdump -D notmain.elf > notmain.list
+	$(ARMGNU)-objcopy -O binary notmain.elf notmain.bin

new_one/nothumb2/flash.ld

@@ -0,0 +1,11 @@
+
+MEMORY
+{
+    ram : ORIGIN = 0x00000000, LENGTH = 0x1000
+}
+
+SECTIONS
+{
+    .text : { *(.text*) } > ram
+}
+

new_one/nothumb2/flash.s

@@ -0,0 +1,18 @@
+
+.cpu cortex-m0
+.thumb
+
+.thumb_func
+.global _start
+_start:
+	stacktop: .word 0x20001000
+	.word reset
+
+.thumb_func
+reset:
+	nop
+	nop
+	dmb
+	bkpt
+	bkpt
+	bkpt

new_one/thumbulator.c

@@ -7,12 +7,21 @@ unsigned int read32 ( unsigned int );
 
 unsigned int read_register ( unsigned int );
 
-#define DBUGFETCH   0
-#define DBUGRAM     0
-#define DBUGRAMW    0
-#define DBUGREG     0
-#define DBUG        0
-#define DISS        1
+//#define DBUGFETCH   0
+//#define DBUGRAM     0
+//#define DBUGRAMW    0
+//#define DBUGREG     0
+//#define DBUG        0
+//#define DISS        1
+
+unsigned int DBUGFETCH =  0;
+unsigned int DBUGRAM   =  0;
+unsigned int DBUGRAMW  =  0;
+unsigned int DBUGREG   =  0;
+unsigned int DBUG      =  0;
+unsigned int DISS      =  0;
+
+
 
 #define ROMADDMASK 0xFFFFF
 #define RAMADDMASK 0xFFFFF
@@ -918,6 +927,15 @@ if(DISS) fprintf(stderr,"\n");
             rb+=pc;
             rb+=2;
             write_register(14,rb);
+			//read_register(15);
+			//fetch16();
+			rc=pc&ROMADDMASK;
+			rd=rom[rc>>1];	
+			if((rd&0xF800)!=0xF800)
+			{
+				fprintf(stderr,"0x%08X 0x%04X 0x%04X thumb2 not supported\n",pc-2,inst,rd);
+				exit(1);
+			}
             return(0);
         }
         else
@@ -932,12 +950,12 @@ if(DISS) fprintf(stderr,"bl 0x%08X\n",rb);
             write_register(15,rb);
             return(0);
         }
-        else
-        if((inst&0x1800)==0x0800) //H=b01
-        {
-            fprintf(stderr,"cannot BLX to arm 0x%08X 0x%04X\n",pc-2,inst);
-            exit(1);
-        }
+        //else
+        //if((inst&0x1800)==0x0800) //H=b01
+        //{
+            //fprintf(stderr,"cannot BLX to arm 0x%08X 0x%04X\n",pc-2,inst);
+            //exit(1);
+        //}
     }
 
     //BLX(2)
@@ -2106,6 +2124,9 @@ int main ( int argc, char *argv[] )
     for(ra=2;ra<argc;ra++)
     {
         if(strcmp(argv[ra],"--vcd")==0) output_vcd=1;
+        if(strcmp(argv[ra],"--diss")==0) DISS=1;
+        if(strcmp(argv[ra],"--dbugram")==0) DBUGRAM=1;
+        if(strcmp(argv[ra],"--dbugreg")==0) DBUGREG=1;
     }
     fp=fopen(argv[1],"rb");
     if(fp==NULL)

thumbulator.c

@@ -884,7 +884,7 @@ if(DISS) fprintf(stderr,"ble 0x%08X\n",rb-3);
         rb<<=1;
         rb+=pc;
         rb+=2;
-if(DISS) fprintf(stderr,"B 0x%08X\n",rb-3);
+if(DISS) fprintf(stderr,"B 0x%08X\n",rb-4);
         write_register(15,rb);
         return(0);
     }
@@ -933,7 +933,7 @@ if(DISS) fprintf(stderr,"\n");
             rb+=(inst&((1<<11)-1))<<1;;
             rb+=2;
 
-if(DISS) fprintf(stderr,"bl 0x%08X\n",rb-3);
+if(DISS) fprintf(stderr,"bl 0x%08X\n",rb-2);
             write_register(14,(pc-2)|1);
             write_register(15,rb);
             return(0);