[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 19/34] xen/arm: Provide eabi wrapper for __aeabi_mem* functions
On 03/26/2014 10:39 AM, Ian Campbell wrote: > On Tue, 2014-03-25 at 18:12 +0000, Julien Grall wrote: >> Hi Ian, >> >> On 03/25/2014 05:25 PM, Ian Campbell wrote: >>> On Tue, 2014-03-25 at 16:55 +0000, Julien Grall wrote: >>>> Clang doesn't provide function __aebai_mem*, implement generically as a >>>> wrapper >>>> for mem* function provided by Xen. >>> >>> Where are the references to these functions coming from if not from the >>> compiler? >> >> Theses functions are called by the code generated by the compiler. > > And who normally provides them when building with clang? Some sort of > libclang I guess? I've tried to compile a same compilation unit with gcc and clang. gcc is inlining the call to __aebi_*. See below: Clang assembly: 000002b8 <wallclock_time>: 2b8: e92d4800 push {fp, lr} 2bc: e1a0b00d mov fp, sp 2c0: e3a01024 mov r1, #36 ; 0x24 2c4: e3a02000 mov r2, #0 2c8: ebfffffe bl 0 <__aeabi_memset> 2cc: e8bd8800 pop {fp, pc} GCC assembly: 00000378 <wallclock_time>: 378: e52db004 push {fp} ; (str fp, [sp, #-4]!) 37c: e28db000 add fp, sp, #0 380: e3a02000 mov r2, #0 384: e1a03000 mov r3, r0 388: e4832004 str r2, [r3], #4 38c: e5802004 str r2, [r0, #4] 390: e2833004 add r3, r3, #4 394: e4832004 str r2, [r3], #4 398: e4832004 str r2, [r3], #4 39c: e4832004 str r2, [r3], #4 3a0: e4832004 str r2, [r3], #4 3a4: e4832004 str r2, [r3], #4 3a8: e4832004 str r2, [r3], #4 3ac: e5832000 str r2, [r3] 3b0: e24bd000 sub sp, fp, #0 3b4: e49db004 pop {fp} ; (ldr fp, [sp], #4) 3b8: e12fff1e bx lr Regards, -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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