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+
+qemu-system-arm emulator
+
+Hi,
+
+I don't know if this is a bug or a feature in new QEMU software. I was following an online tutorial using QEMU  to develop a simple bare-metal program for qemu-system-arm. I decided to try a more recent software and I got surprised when I found the small code can not run on newer QEMU software (all newer than 2.0.0) but can run on the old QEMU from Ubuntu (Debian 2.0.0+dfsg-2ubuntu1.22) and the stock version from website. After putting the qemu-system-arm in single step and saving the log, the following is the output which you can see the 1st instruction stores R3 at [fp, #-8] and the second instruction can not restores the value from the same address to R0:
+
+0x00010074:  e50b3008      str	r3, [fp, #-8]
+
+R00=00000000 R01=00000000 R02=00000000 R03=0001008c
+R04=00000000 R05=00000000 R06=00000000 R07=00000000
+R08=00000000 R09=00000000 R10=00000000 R11=00011094
+R12=00000000 R13=00011088 R14=00010008 R15=00010074
+PSR=400001d3 -Z-- A S svc32
+----------------
+IN: kmain
+0x00010078:  e51b0008      ldr	r0, [fp, #-8]
+
+R00=00000000 R01=00000000 R02=00000000 R03=0001008c
+R04=00000000 R05=00000000 R06=00000000 R07=00000000
+R08=00000000 R09=00000000 R10=00000000 R11=00011094
+R12=00000000 R13=00011088 R14=00010008 R15=00010078
+PSR=400001d3 -Z-- A S svc32
+----------------
+IN: kmain
+0x0001007c:  ebffffe3      bl	0x10010
+
+R00=00000000 R01=00000000 R02=00000000 R03=0001008c
+R04=00000000 R05=00000000 R06=00000000 R07=00000000
+R08=00000000 R09=00000000 R10=00000000 R11=00011094
+R12=00000000 R13=00011088 R14=00010008 R15=0001007c
+PSR=400001d3 -Z-- A S svc32
+
+--------------------------------------
+Meanwhile the older version of QEMU 2.0.0 does this very well and can execute the program normally:
+
+0x00010074:  e50b3008      str	r3, [fp, #-8]
+
+R00=00000000 R01=00000000 R02=00000000 R03=0001008c
+R04=00000000 R05=00000000 R06=00000000 R07=00000000
+R08=00000000 R09=00000000 R10=00000000 R11=00011094
+R12=00000000 R13=00011088 R14=00010008 R15=00010074
+PSR=400001d3 -Z-- A svc32
+----------------
+IN: kmain
+0x00010078:  e51b0008      ldr	r0, [fp, #-8]
+
+R00=00000000 R01=00000000 R02=00000000 R03=0001008c
+R04=00000000 R05=00000000 R06=00000000 R07=00000000
+R08=00000000 R09=00000000 R10=00000000 R11=00011094
+R12=00000000 R13=00011088 R14=00010008 R15=00010078
+PSR=400001d3 -Z-- A svc32
+----------------
+IN: kmain
+0x0001007c:  ebffffe3      bl	0x10010
+
+R00=0001008c R01=00000000 R02=00000000 R03=0001008c
+R04=00000000 R05=00000000 R06=00000000 R07=00000000
+R08=00000000 R09=00000000 R10=00000000 R11=00011094
+R12=00000000 R13=00011088 R14=00010008 R15=0001007c
+PSR=400001d3 -Z-- A svc32
+----------------
+
+The command line to use was:
+
+qemu-system-arm -M vexpress-a9 -cpu cortex-a9 -smp 1 -m 64M -nographic -kernel kernel.elf -singlestep -D file.log -d in_asm,cpu
+
+The kernel.elf is a simple program (elf) file, created from two sources:
+
+boot.S:
+
+.global _RESET
+_RESET:
+LDR sp, =_STACK
+BL kmain
+B .
+
+And kernel.c:
+
+# define UART0_MEM   0x10009000
+
+volatile unsigned int * const UART0 = (unsigned int *) UART0_MEM;
+void dprint(const char* message){
+	while(*message != 0) {
+		*UART0=*message;
+		++message;
+	}
+}
+void kmain() {
+	const char *hi="Hello!";
+	dprint(hi);
+};
+
+The linker scripts is:
+ENTRY(_RESET)
+SECTIONS
+{
+ . = 0x10000;
+ .boot . : { boot.o(.text) }
+ .text : { *(.text) }
+ .data : { *(.data) }
+ .bss : { *(.bss COMMON) }
+ . = ALIGN(8);
+ . = . + 0x1000; /* 4kB of stack memory */
+ _STACK = .;
+}
+
+This error cases the dprint function to find *message as 0 and do not print the output in newer QEMU software.
+
+Thank you for consideration.
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