[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 --- Comment #8 from Andrew Pinski --- If anything it should be the linker which should error out. The linker is part of binutils, report it to them.
[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 --- Comment #7 from Bruno Haible --- And what do you think about the fact that it produces crashing code without any warning? Is there a chance that 'as' could emit a warning when it produces R_SPARC_GOT22/R_SPARC_GOT10 relocations instead of the intended R_SPARC_HI22/R_SPARC_LO10 relocations?
[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 --- Comment #6 from Bruno Haible --- > passing -fno-pie seems to be the agreed upon way out here. My assembly code is located in a library (think at libffcall, libffi, gmp, ...). Therefore I don't control the final linker options. So, the only available option the '#ifdef __PIC__' solution from comment 2.
[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 Eric Botcazou changed: What|Removed |Added Status|NEW |RESOLVED Resolution|--- |WONTFIX --- Comment #5 from Eric Botcazou --- OK, thanks, so passing -fno-pie seems to be the agreed upon way out here.
[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 --- Comment #4 from Jakub Jelinek --- Obviously, if you are compiling hand written assembly and linking it into PIEs the code must be PIC. So what is written in #c2 is not a workaround, but the right fix. If you have assembly that is not PIC compatible and you don't want to link it into a PIE, either don't configure the compiler with --enable-default-pie, or compile it with -fno-pie and link with -no-pie. This isn't any different from any other arch; if you link in non-PIC assembly into PIEs, either stuff doesn't link, or you get text relocations.
[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 Eric Botcazou changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed||2017-08-05 CC||ebotcazou at gcc dot gnu.org, ||jakub at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #3 from Eric Botcazou --- Jakub, you're probably the only one with enough expertise in this area to give an informed opinion. What do you think? How does that work for other targets?
[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 Bruno Haible changed: What|Removed |Added Target||sparc64-linux-gnu --- Comment #2 from Bruno Haible --- Apparently, on SPARC, there are two ways of referring to global variables from within .s files. The non-PIC way is sethi %hi(variable), %g1 or %g1, %lo(variable), %g1 The PIC way is sethi %hi(_GLOBAL_OFFSET_TABLE_-8), %l7 add %l7, %lo(_GLOBAL_OFFSET_TABLE_-4), %l7 call__sparc_get_pc_thunk.l7 nop sethi %gdop_hix22(variable), %g1 xor %g1, %gdop_lox10(variable), %g1 ld [%l7 + %g1], %g1, %gdop(variable) The ugly thing is that * the non-PIC way, compiled by "gcc -fPIC", crashes, * the PIC way, compiled by "gcc" without -fPIC and without --enable-default-pie, crashes as well. So in order to write hand-written assembly that accesses global variables, one has to write a .S file (that gets preprocessed!) #ifdef __PIC__ sethi %hi(_GLOBAL_OFFSET_TABLE_-8), %l7 add %l7, %lo(_GLOBAL_OFFSET_TABLE_-4), %l7 call__sparc_get_pc_thunk.l7 nop sethi %gdop_hix22(variable), %g1 xor %g1, %gdop_lox10(variable), %g1 ld [%l7 + %g1], %g1, %gdop(variable) #else sethi %hi(variable), %g1 or %g1, %lo(variable), %g1 #endif Is this the only workaround to a silent change of behaviour of commands such as "gcc -c getter.s" ?
[Bug driver/81653] gcc configured with --enable-default-pie on SPARC miscompiles hand-written .s files
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81653 --- Comment #1 from Bruno Haible --- Created attachment 41885 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41885=edit Test case program, part 2
