I suspect that the wrong version of libgcc.a is being used during the
linking stage. I'm probably not using the correct compile/link time
flags, but as far as I know everything is as it should be.
My program consists of a simple 32x32->64 multiply but the wrong code
is being linked for muldi3. Here is the relevant dissassembly:
000011e2 <__muldi3>:
11e2: 04 12 push r4 ;
11e4: 05 12 push r5 ;
11e6: 06 12 push r6 ;
11e8: 07 12 push r7 ;
11ea: 08 12 push r8 ;
11ec: 09 12 push r9 ;
11ee: 0a 12 push r10 ;
11f0: 0b 12 push r11 ;
11f2: 14 41 12 00 mov 18(r1), r4 ;
11f6: 15 41 14 00 mov 20(r1), r5 ;
11fa: 16 41 16 00 mov 22(r1), r6 ;
11fe: 17 41 18 00 mov 24(r1), r7 ;
1202: 0b 43 clr r11 ;
1204: 0a 43 clr r10 ;
1206: 09 43 clr r9 ;
1208: 08 43 clr r8 ;
120a: 12 c3 clrc
120c: 07 10 rrc r7 ;
120e: 06 10 rrc r6 ;
1210: 05 10 rrc r5 ;
1212: 04 10 rrc r4 ;
1214: 04 28 jnc $+10 ;abs 0x121e
1216: 08 5c add r12, r8 ;
1218: 09 6d addc r13, r9 ;
121a: 0a 6e addc r14, r10 ;
121c: 0b 6f addc r15, r11 ;
121e: 0c 5c rla r12 ;
1220: 0d 6d rlc r13 ;
1222: 0e 6e rlc r14 ;
1224: 0f 6f rlc r15 ;
1226: 04 93 cmp #0, r4 ;r3 As==00
1228: f0 23 jnz $-30 ;abs 0x120a
122a: 05 93 cmp #0, r5 ;r3 As==00
122c: ee 23 jnz $-34 ;abs 0x120a
122e: 06 93 cmp #0, r6 ;r3 As==00
1230: ec 23 jnz $-38 ;abs 0x120a
1232: 07 93 cmp #0, r7 ;r3 As==00
1234: ea 23 jnz $-42 ;abs 0x120a
1236: 0c 48 mov r8, r12 ;
1238: 0d 49 mov r9, r13 ;
123a: 0e 4a mov r10, r14 ;
123c: 0f 4b mov r11, r15 ;
123e: 3b 41 pop r11 ;
1240: 3a 41 pop r10 ;
1242: 39 41 pop r9 ;
1244: 38 41 pop r8 ;
1246: 37 41 pop r7 ;
1248: 36 41 pop r6 ;
124a: 35 41 pop r5 ;
124c: 34 41 pop r4 ;
124e: 30 41 ret
as you can see, this is the code from the section of libgcc.S that
*doesn't* use the hw multiplier.
So, based on my command line, in which you can see the correct flags
for enabling the hw multiplier, I believe that the wrong library is
being referenced. Here is a capture of the entire compilation:
msp430-gcc -g -mmcu=msp430x149 -v -c irap.c
Reading specs from /usr/local/msp430/lib/gcc-lib/msp430/3.2.3/specs
Configured with: ./configure --target msp430 --prefix=/usr/local/msp430
Thread model: single
gcc version 3.2.3
/usr/local/msp430/lib/gcc-lib/msp430/3.2.3/cc1 -lang-c -v -D__GNUC__=3
-D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=3 -D__GXX_ABI_VERSION=102
-DMSP430 -D__MSP430__ -D__MSP430 -D__NO_INLINE__ -D__STDC_HOSTED__=1
-DMSP430_HAS_HW_MUL -D__MSP430_149__ -DMSP430_HAS_HWMUL
-D__SIZE_TYPE__=unsigned int -D__PTRDIFF_TYPE__=int -D__INT_MAX__=32767
irap.c -quiet -dumpbase irap.c -mmcu=msp430x149 -g -version -o
/tmp/ccMU1ndI.s
GNU CPP version 3.2.3 (cpplib) (GNU assembler syntax)
GNU C version 3.2.3 (msp430)
compiled by GNU C version 3.2.2 20030222 (Red Hat Linux
3.2.2-5).
ignoring nonexistent directory "/usr/local/msp430/msp430/sys-include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/msp430/include
/usr/local/msp430/lib/gcc-lib/msp430/3.2.3/include
/usr/local/msp430/msp430/include
End of search list.
/usr/local/msp430/lib/gcc-lib/msp430/3.2.3/../../../../msp430/bin/as
-o irap.o
/tmp/ccMU1ndI.s
msp430-gcc -g -m msp430x149 irap.o -o irap
I could hardcode the makefile to link in the correct lib from
/usr/local/msp430/lib/gcc-lib/msp430/3.2.3/msp2/libgcc.a, but in my
opinion the linker should do that based on the fact that I specify a
mmcu that contains a hw multiplier.
Any ideas?
-A
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