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User-Agent: Mozilla/4.75 [en] (X11; U; Linux 2.2.15-3SGI_39 i686)


Looks like __ia64_syscall is not being exported from libc ?

On Fisher.
# objdump -t libc.so.6.1 | grep  __ia64_syscall
0000000000036e60 l     F .text  0000000000000000   __ia64_syscall




Reproducible: Always
Steps to Reproduce:
Compile any code that defines its own system calls, in the example below I
define a new syscall _getpid() to illistrate the problem (_syscall0 was
copied from asm/unistd.h and then a leading _## was added to name), this
code works on Turbo Linux.

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <asm/types.h>
#include <asm/unistd.h>

#define _syscall0(type,name)                        \
type                                    \
_##name (void)                             \
{                                   \
    register long dummy1 __asm__ ("out0");              \
    register long dummy2 __asm__ ("out1");              \
    register long dummy3 __asm__ ("out2");              \
    register long dummy4 __asm__ ("out3");              \
    register long dummy5 __asm__ ("out4");              \
                                    \
    return __ia64_syscall(dummy1, dummy2, dummy3, dummy4, dummy5,   \
                  __NR_##name);             \
}

static _syscall0(pid_t,getpid)

int
main(int argc, char **argv)
{


    printf("getpid() = %d\n",getpid());
    printf("getpid() = %d\n",_getpid());

    return 0;
}





# gcc -v -o syscall syscall.c
Reading specs from
/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/specs
gcc version 2.96-ia64-000717 snap 001117
 /usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/cpp -lang-c -v
-D__GNUC__=2 -D__GNUC_MINOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ia64
-D__ia64__ -D__linux -D__linux__ -D_LONGLONG -Dlinux -Dunix -D__LP64__
-D__ELF__ -D__ia64 -D__ia64__ -D__linux -D__linux__ -D_LONGLONG -D__linux__
-D__unix__ -D__LP64__ -D__ELF__ -D__linux -D__unix -Asystem(linux)
-Acpu(ia64) -Amachine(ia64) -D__LONG_MAX__=9223372036854775807L syscall.c
/tmp/cc97Wx11.i
GNU CPP version 2.96-ia64-000717 snap 001117 (cpplib)
 (IA-64)
ignoring nonexistent directory "/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/include
 /usr/ia64-redhat-linux/include
 /usr/include
End of search list.
syscall.c:12:18: warning: "_syscall0" redefined
/usr/include/asm/unistd.h:212:1: warning: this is the location of the
previous definition
 /usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/cc1 /tmp/cc97Wx11.i
-mb-step -quiet -dumpbase syscall.c -version -o /tmp/cco8GnjW.s
GNU C version 2.96-ia64-000717 snap 001117 (ia64-redhat-linux) compiled by
GNU C version 2.96-ia64-000717 snap 001117.

/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/../../../../ia64-redhat-linux/bin/as
-x -o /tmp/cc35CB8X.o /tmp/cco8GnjW.s
 /usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/collect2
-dynamic-linker /lib/ld-linux-ia64.so.2 -o syscall
/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/../../../crt1.o
/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/../../../crti.o
/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/crtbegin.o
-L/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717
-L/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/../../../../ia64-redhat-linux/lib
-L/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/../../..
/tmp/cc35CB8X.o -lgcc -lc -lgcc
/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/crtend.o
/usr/lib/gcc-lib/ia64-redhat-linux/2.96-ia64-000717/../../../crtn.o
/tmp/cc35CB8X.o: In function `_getpid':
/tmp/cc35CB8X.o(.text+0x22): undefined reference to `__ia64_syscall'
collect2: ld returned 1 exit status