Hi All,
I have some strange code with gcc-3.2.3/binutils 2.16.1/msp430-libc
(from the cvs).
I have a function that takes a function pointer, this function pointer
gets pushed onto the stack.
The function prolog pushes the function pointer onto the stack as
push r15, 12(r1)
and then uses it in the function as
call 12(r1)
which is incorrect, because the call function decrements the stack
pointer, then does the indirection, it should compile as
call 10(r1)
this appears to be a msp430-gcc bug and is quite hard to replicate.
Here is the output from msp430-objdump
int vuprintf(register int (*func)(int), const char *fmt, va_list ap) {
14: 0b 12 push r11 ;
16: 0a 12 push r10 ;
18: 09 12 push r9 ;
1a: 08 12 push r8 ;
1c: 07 12 push r7 ;
1e: 06 12 push r6 ;
20: 05 12 push r5 ;
22: 04 12 push r4 ;
24: 31 80 1c 00 sub #28, r1 ;#0x001c
28: 81 43 10 00 mov #0, 16(r1) ;r3 As==00
2c: 81 43 12 00 mov #0, 18(r1) ;r3 As==00
30: 81 4f 0c 00 mov r15, 12(r1) ;
34: 04 4e mov r14, r4 ;
36: 81 4d 0e 00 mov r13, 14(r1) ;
union {
char c;
uint8_t u8;
int8_t i8;
long l;
unsigned long ul;
char *pc;
#if PRINTF_LEVEL >= PRINTF_FLT
double d;
div_t dv;
#endif
} a;
char c; /* holds a char from the format string */
uint8_t base = 10;
3a: f1 40 0a 00 mov.b #10, 20(r1) ;#0x000a
3e: 14 00
char b[BUFLEN]; /*
* Contains character representation of the
* number and its prefix, written from back
* to front.
*/
char *pb = 0; /* used as pointer to an element in b */
40: 81 43 16 00 mov #0, 22(r1) ;r3 As==00
int total_len;
#if PRINTF_LEVEL > PRINTF_MIN
int8_t width = 0;
44: c1 43 18 00 mov.b #0, 24(r1) ;r3 As==00
int8_t prec = 0;
48: c1 43 19 00 mov.b #0, 25(r1) ;r3 As==00
#endif
#if PRINTF_LEVEL >= PRINTF_FLT
int8_t decpt = 0;
char *fb; /* floating point buffer, malloc'ed */
#endif
#if PRINTF_LEVEL < PRINTF_STD
uint8_t flags;
#else
uint16_t flags;
#endif
flags = 0;
4c: 81 43 1a 00 mov #0, 26(r1) ;r3 As==00
total_len = 0;
#if PRINTF_LEVEL >= PRINTF_FLT
fb = 0;
#endif
// __write_char = func;
DOPRINT('A');
50: 3f 40 41 00 mov #65, r15 ;#0x0041
54: 91 12 0c 00 call 12(r1) ;
Anyone got any ideas?
Thanks,
--
Peter Jansen
STS
Australian Antarctic Division
203 Channel Highway
Kingston
TAS 7050
AUSTRALIA
Phone +61 3 6232 3533
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