Can anyone shed light on this problem? with a relatively recent (within
the last few weeks) snap of SDCC the following code misbehaves (at least as
far as printing goes):
// start of running stack (in DATA memory)
__data uint8 * __data sys_rstack;
...
// get the start of the stack
__asm
mov a,#__start__stack
mov _sys_rstack,a
__endasm;
as expected (dumping memory with a debugger) sys_rstack contains the hex
value of the intitial stack (0x45 in this case). In the main routine a
printf gets the wrong value:
extern __data uint8 * __data sys_rstack;
// string for LCD output
#define STR_LEN 80
__xdata uint8 str[STR_LEN];
...
main()
{
...
sprintf (str,"%x", (uint8) *sys_rstack);
lcd_print(2, str);
generates:
707 ; main.c:107: sprintf (str,"%x", (uint8) *
sys_rstack);
01B4 A9 10 708 mov r1,_sys_rstack
01B6 87 07 709 mov ar7,@r1
01B8 C0 07 710 push ar7
01BA 74 53 711 mov a,#__str_3
01BC C0 E0 712 push acc
01BE 74 7E 713 mov a,#(__str_3 >> 8)
01C0 C0 E0 714 push acc
01C2 74 80 715 mov a,#0x80
01C4 C0 E0 716 push acc
01C6 74 DC 717 mov a,#_str
01C8 C0 E0 718 push acc
01CA 74 01 719 mov a,#(_str >> 8)
01CC C0 E0 720 push acc
01CE E4 721 clr a
01CF C0 E0 722 push acc
01D1 12 7D 15 723 lcall _sprintf
01D4 E5 81 724 mov a,sp
01D6 24 F9 725 add a,#0xf9
01D8 F5 81 726 mov sp,a
727 ; main.c:108: lcd_print(2, str);
but displays on the LCD 6100 rather than the expected (because thats whats in
data location 10H) 45. The code above appears to be loading the contents of
sys_rstack (at 0x10 in data) in to r7 but something undesirable happens after
that (which may well be operator error on my part).
debug cmd> d D:0000 24
0000: 00 00 02 03 00 40 1E 00 C1 0F 15 00 6F 03 18 18
0010: 45 2F 01 05 5D 02 00 00 DE 10 00 02 04 08 00 00
0020: 51 0A 04 01
Peter Van Epp
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