v850-elf-gcc, va_list
markku.pihlajamaa@luukku.com
markku.pihlajamaa@luukku.com
Wed Apr 24 00:25:00 GMT 2002
Hello,
I have submitted a GCC bug report about this and tried
to solve the problem by the patch below. After v850-elf-gcc
and Newlib have been rebuilt, the first few tests with sprintf()
are succesful.
Markku
----------------------------------------------------------------
*** gcc/config/v850/v850.c.original Sat Jan 8 10:15:57 2000
--- gcc/config/v850/v850.c Tue Apr 23 13:55:30 2002
***************
*** 3653,3659 ****
incr = build (MODIFY_EXPR, ptr_type_node, valist, incr);
TREE_SIDE_EFFECTS (incr) = 1;
- expand_expr (incr, const0_rtx, VOIDmode, EXPAND_NORMAL);
addr_rtx = expand_expr (addr, NULL, Pmode, EXPAND_NORMAL);
if (indirect)
--- 3653,3660 ----
incr = build (MODIFY_EXPR, ptr_type_node, valist, incr);
TREE_SIDE_EFFECTS (incr) = 1;
addr_rtx = expand_expr (addr, NULL, Pmode, EXPAND_NORMAL);
+
+ expand_expr (incr, const0_rtx, VOIDmode, EXPAND_NORMAL);
if (indirect)
----------------------------------------------------------------
> -----Original Message-----
> From: markku.pihlajamaa@luukku.com
> [mailto:markku.pihlajamaa@luukku.com]
> Sent: Thursday, April 18, 2002 12:39 PM
> To: crossgcc@sources.redhat.com
> Subject: v850-elf-gcc, va_list
>
>
>
> Hello everybody!
>
> I suppose my first post was catched by the spam checking,
> so I am trying another time.
>
> I am doing some tests with the GNU C cross compiler,
> configured for the v850-elf target. The compiler
> is run on a PC and the operating system is
> Red Hat Linux 7.1.
>
> I have such a problem with the variable argument lists
> that the first optional argument is not expanded by
> va_arg() at all, but is skipped. In the example
> below the out() function is called four times,
> but the parameter gets bad values: 2, 3, 4 and a random
> number instead of 1, 2, 3 and 4.
>
> The C code, compiling command I have used and the
> assembly output produced (with my comments added)
> can be seen below.
>
> Any ideas are welcomed.
>
> Regards,
> Markku
>
> ----------------------------------------------------
> #include <stdarg.h>
>
> extern int out ( int );
>
> void test( int parc, ... )
> {
> va_list list;
>
> va_start( list, parc );
>
> while( parc )
> {
> int i;
>
> i = va_arg( list, int );
>
> out( i );
>
> parc --;
> }
>
> va_end( list );
> }
>
>
> int main( void )
> {
> test( 4, 1, 2, 3, 4 );
>
> return 0;
> }
> ----------------------------------------------------
> [markku@linux1 va_list]$ v850-elf-gcc -S -v test.c
> Reading specs from /usr/local/lib/gcc-lib/v850-elf/2.96-xscale-
> 010827/specs
> gcc version 2.96-xscale-010827
> /usr/local/lib/gcc-lib/v850-elf/2.96-xscale-010827/cpp -lang-c -v -
> D__GNUC__=2
> -D__GNUC_MINOR__=96 -D__v851__ -D__v850 -D__v851__ -D__v850 -
> D__v850__ test.c /t
> mp/cc5YEVvf.i
> GNU CPP version 2.96-xscale-010827 (cpplib)
> (NEC V850)
> ignoring nonexistent directory `/usr/local/v850-elf/sys-include'
> #include "..." search starts here:
> #include <...> search starts here:
> /usr/local/lib/gcc-lib/v850-elf/2.96-xscale-010827/include
> /usr/local/v850-elf/include
> End of search list.
> /usr/local/lib/gcc-lib/v850-elf/2.96-xscale-
> 010827/cc1 /tmp/cc5YEVvf.i -quiet -
> dumpbase test.c -version -o test.s
> GNU C version 2.96-xscale-010827 (v850-elf) compiled by GNU C
version
> 2.96 20000
> 731 (Red Hat Linux 7.1 2.96-81).
> [markku@linux1 va_list]$ cat test.s
> .file "test.c"
> gcc2_compiled.:
> .section .text
> .align 1
> .global _test
> .type _test,@function
> _test:
> st.w r6,0[sp]
> st.w r7,4[sp]
> st.w r8,8[sp]
> st.w r9,12[sp]
> ----------------------------------------------------
> The copies of the arguments are in the top of
> stack at this point:
> 1st 0[sp]
> 2nd 4[sp]
> 3rd 8[sp]
> 4th 12[sp]
> 5th 16[sp] (pushed by the caller)
> ----------------------------------------------------
> addi -36,sp,sp
> st.w r31,32[sp]
> st.w r28,28[sp]
> st.w r29,24[sp]
> mov sp,r29
> ----------------------------------------------------
> r29 is used as a frame pointer
> ----------------------------------------------------
> st.w r6,36[r29]
> ----------------------------------------------------
> loop counter initialisation, actually done at _test:
> ----------------------------------------------------
> addi 40,r29,r10
> st.w r10,20[r29]
> ----------------------------------------------------
> 20[r29] points to the next argument, initially 40[r29]
> or the copy of the 2nd argument
> ----------------------------------------------------
> .L3:
> ld.w 36[r29],r10
> cmp r0,r10
> bne .L5
> br .L4
> .L5:
> ld.w 20[r29],r10
> addi 4,r10,r11
> st.w r11,20[r29]
> ----------------------------------------------------
> the address of the next argument value has been read,
> incremented and written back
> ----------------------------------------------------
> ld.w 20[r29],r28
> ----------------------------------------------------
> the address that has already been incremented
> is read again; this way the first optional argument
> is ignored
> ----------------------------------------------------
> ld.w 0[r28],r10
> st.w r10,16[r29]
> ld.w 16[r29],r6
> jarl _out,r31
> ld.w 36[r29],r10
> addi -1,r10,r11
> st.w r11,36[r29]
> br .L3
> .L4:
> .L2:
> mov r29,sp
> ld.w 32[sp],r31
> ld.w 28[sp],r28
> ld.w 24[sp],r29
> addi 36,sp,sp
> jmp [r31]
> .Lfe1:
> .size _test,.Lfe1-_test
> .align 1
> .global _main
> .type _main,@function
> _main:
> addi -28,sp,sp
> st.w r31,24[sp]
> st.w r29,20[sp]
> mov sp,r29
> mov 4,r10
> st.w r10,16[sp]
> mov 4,r6
> mov 1,r7
> mov 2,r8
> mov 3,r9
> jarl _test,r31
> mov 0,r10
> br .L6
> .L6:
> mov r29,sp
> ld.w 24[sp],r31
> ld.w 20[sp],r29
> addi 28,sp,sp
> jmp [r31]
> .Lfe2:
> .size _main,.Lfe2-_main
> .ident "GCC: (GNU) 2.96-xscale-010827"
> ----------------------------------------------------
>
>
> ...............................................
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>
>
>
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