gcc 3.4.3 bug C++/inlines/thumb

["Carl van_Schaik" <navlrac at hotmail dot com>]

I'm running into a bug with gcc 3.4.3:

I've got syscall code for user-land to our kernel that trashes r14/lr.
The code is inlined, and works find in ARM mode. When compiling in thumb, 
gcc does not preserve lr. With an older gcc 3.3.3, the code was not inlined, 
but generated correctly.

L4_INLINE void * L4_KernelInterface (L4_Word_t *ApiVersion,
                                    L4_Word_t *ApiFlags,
                                    L4_Word_t *KernelId)
{
   register L4_Word_t base_address asm ("r0");
   register L4_Word_t _ApiVersion  asm ("r1");
   register L4_Word_t _ApiFlags    asm ("r2");
   register L4_Word_t _KernelId    asm ("r3");

   __asm__ __volatile__ (
           "mov     lr,     pc\n"
           "mov     pc,     %[trap_kip]\n"
           : "=r" (base_address), "=r" (_ApiVersion), "=r" (_ApiFlags),
             "=r" (_KernelId)
           : [trap_kip] "r" (L4_TRAP_KIP)
           : "lr", "memory" );

   if (ApiVersion) *ApiVersion = _ApiVersion;
   if (ApiFlags) *ApiFlags = _ApiFlags;
   if (KernelId) *KernelId = _KernelId;

   return (void *)base_address;
}

--- inline asm marked at '*'

00051bac <__L4_Init>:
  51bac:       204c            mov     r0, #76
  51bae:       4240            neg     r0, r0
*  51bb0:       46fe            mov     lr, pc
*  51bb2:       4687            mov     pc, r0
  51bb4:       2298            mov     r2, #152
  51bb6:       0052            lsl     r2, r2, #1
  51bb8:       1883            add     r3, r0, r2
  51bba:       681b            ldr     r3, [r3, #0]
...

---


Reading specs from 
/home/extra/opt/tools/3.4.3-elf/bin/../lib/gcc/arm-elf/3.4.3/specs
Configured with: ../gcc-3.4.3/configure --prefix=/opt/tools/3.4.3-elf 
--target=arm-elf --with-float=soft --with-arch=armv5te 
--enable-cxx-flags=-march=armv5te --enable-languages=c,c++ : (reconfigured) 
../gcc-3.4.3/configure --prefix=/opt/tools/3.4.3-elf --target=arm-elf 
--with-float=soft --enable-languages=c,c++
Thread model: single
gcc version 3.4.3

thanks,
Carl van Schaik

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