[crt] Enable sparc and mips targets

[xbjfk]

Summary

This patch enables sparc and mips in compiler-rt CRT, meaning that now every platform supported by compiler-rt builtins (that runs on Linux, i.e. not WebAssembly) will be suported by compiler-rt CRT

[phosek]

compiler-rt/lib/crt/crtbegin.c

78

Is this needed? We removed this prefix from all other implementations in D147093.

[xbjfk]

Remove USER_LABEL_PREFIX

[xbjfk]

compiler-rt/lib/crt/crtbegin.c

78

Apologies, I have removed it.

[phosek]

LGTM

[xbjfk]

Hey I forgot to mention, can you merge this since I dont have commit access yet? Thanks.

[MaskRay]

Have you tested it on mips machines? And how?

compiler-rt/lib/crt/crtbegin.c

76

move __mips__ before for a relatively sorted order.

[xbjfk]

update order in file

[xbjfk]

In D147819#4259740, @MaskRay wrote:

Have you tested it on mips machines? And how?

I don't have physical MIPS hardware, but I removed the definition of CRT_HAS_INITFINI_ARRAY in CMake (so the assembly version was used) and tested in a QEMU virtual machine. I made sure the __do_init and __do_fini functions were called by putting a puts call in them (cheap, I know)

[xbjfk]

Update: I found a MIPS WiFi router (mipsel) cross compiled a binary for it, and I can confirm it works on real hardware.

[MaskRay]

In D147819#4260087, @xbjfk wrote:

Update: I found a MIPS WiFi router (mipsel) cross compiled a binary for it, and I can confirm it works on real hardware.

Thank you! Can you provide your name and email for the commit message author?

[xbjfk]

In D147819#4263061, @MaskRay wrote:

In D147819#4260087, @xbjfk wrote:

Update: I found a MIPS WiFi router (mipsel) cross compiled a binary for it, and I can confirm it works on real hardware.

Thank you! Can you provide your name and email for the commit message author?

Sure: Reagan Bohan <[e-mail]>

compiler-rt/cmake/crt-config-ix.cmake

 endif()
 
 set(ARM64 aarch64)
 set(ARM32 arm armhf)
 set(HEXAGON hexagon)
 set(X86 i386)
 set(X86_64 x86_64)
 set(LOONGARCH64 loongarch64)
+set(MIPS32 mips mipsel)
+set(MIPS64 mips64 mips64el)
 set(PPC32 powerpc powerpcspe)
 set(PPC64 powerpc64 powerpc64le)
 set(RISCV32 riscv32)
 set(RISCV64 riscv64)
 set(VE ve)
 
 set(ALL_CRT_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${PPC32}
-    ${PPC64} ${RISCV32} ${RISCV64} ${VE} ${HEXAGON} ${LOONGARCH64})
+    ${PPC64} ${RISCV32} ${RISCV64} ${VE} ${HEXAGON} ${LOONGARCH64}
+    ${MIPS32} ${MIPS64} ${SPARC} ${SPARCV9})
 
 include(CompilerRTUtils)
 
 if(NOT APPLE)
   if(COMPILER_RT_CRT_STANDALONE_BUILD)
     test_targets()
   endif()
   # Architectures supported by compiler-rt crt library.

compiler-rt/lib/crt/crtbegin.c

 #elif defined(__riscv)
 __asm__(".pushsection .init,\"ax\",%progbits\n\t"
         "call __do_init\n\t"
         ".popsection");
 #elif defined(__arm__) || defined(__aarch64__)
 __asm__(".pushsection .init,\"ax\",%progbits\n\t"
         "bl __do_init\n\t"
         ".popsection");
+#elif defined(__mips__)
+__asm__(".pushsection .init,\"ax\",@progbits\n\t"
+        "jal __do_init\n\t"
+        ".popsection");
 #elif defined(__powerpc__) || defined(__powerpc64__)
 __asm__(".pushsection .init,\"ax\",@progbits\n\t"
         "bl __do_init\n\t"
         "nop\n\t"
         ".popsection");
 #elif defined(__sparc__)
 __asm__(".pushsection .init,\"ax\",@progbits\n\t"
         "call __do_init\n\t"
         ".popsection");
 #else
 #error "crtbegin without .init_fini array unimplemented for this architecture"
 #endif // CRT_HAS_INITFINI_ARRAY
 
 #ifndef CRT_HAS_INITFINI_ARRAY
 static fp __DTOR_LIST__[]
     __attribute__((section(".dtors"), aligned(sizeof(fp)))) = {(fp)-1};
 extern fp __DTOR_LIST_END__[];
 #endif
 
 static void __attribute__((used)) __do_fini(void) {

 #elif defined(__i386__) || defined(__x86_64__)
 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
         "call __do_fini\n\t"
         ".popsection");
 #elif defined(__arm__) || defined(__aarch64__)
 __asm__(".pushsection .fini,\"ax\",%progbits\n\t"
         "bl __do_fini\n\t"
         ".popsection");
+#elif defined(__mips__)
+__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
+        "jal __do_fini\n\t"
+        ".popsection");
 #elif defined(__powerpc__) || defined(__powerpc64__)
 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
         "bl __do_fini\n\t"
         "nop\n\t"
         ".popsection");
 #elif defined(__riscv)
 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
         "call __do_fini\n\t"
         ".popsection");
 #elif defined(__sparc__)
 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
         "call __do_fini\n\t"
         ".popsection");
 #else
 #error "crtbegin without .init_fini array unimplemented for this architecture"
 #endif  // CRT_HAS_INIT_FINI_ARRAY