diff options
Diffstat (limited to 'libffi/src/x86/sysv.S')
| -rw-r--r-- | libffi/src/x86/sysv.S | 121 |
1 files changed, 83 insertions, 38 deletions
diff --git a/libffi/src/x86/sysv.S b/libffi/src/x86/sysv.S index 7110f02..c7a0fb5 100644 --- a/libffi/src/x86/sysv.S +++ b/libffi/src/x86/sysv.S @@ -888,10 +888,27 @@ ENDF(C(ffi_closure_raw_THISCALL)) #endif /* !FFI_NO_RAW_API */ #ifdef X86_DARWIN -# define COMDAT(X) \ - .section __TEXT,__text,coalesced,pure_instructions; \ +/* The linker in use on earlier Darwin needs weak definitions to be + placed in a coalesced section. That section should not be called + __TEXT,__text since that would be re-defining the attributes of the + .text section (which is an error for earlier tools). Here we use + '__textcoal_nt' which is what GCC emits for this. + Later linker versions are happy to use a normal section and, after + Darwin12 / OSX 10.8, the tools warn that using coalesced sections + for this is deprecated so we must switch to avoid build fails and/or + deprecation warnings. */ +# if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1080 +# define COMDAT(X) \ + .section __TEXT,__textcoal_nt,coalesced,pure_instructions; \ + .weak_definition X; \ + FFI_HIDDEN(X) +# else +# define COMDAT(X) \ + .text; \ .weak_definition X; \ FFI_HIDDEN(X) +# endif #elif defined __ELF__ && !(defined(__sun__) && defined(__svr4__)) # define COMDAT(X) \ .section .text.X,"axG",@progbits,X,comdat; \ @@ -916,7 +933,37 @@ ENDF(C(__x86.get_pc_thunk.dx)) #endif /* DARWIN || HIDDEN */ #endif /* __PIC__ */ -/* Sadly, OSX cctools-as doesn't understand .cfi directives at all. */ +/* Sadly, OSX cctools-as does not understand .cfi directives at all so + we build an eh frame by hand. */ + +#ifdef __APPLE__ +/* The cctools assembler will try to make a difference between two local + symbols into a relocation against, which will not work in the eh (produces + link-time fails). + To avoid this, we compute the symbol difference with a .set directive and + then substitute this value. */ +# define LEN(N, P) .set Llen$N$P,L(N)-L(P); .long Llen$N$P +/* Note, this assume DW_CFA_advance_loc1 fits into 7 bits. */ +# define ADV(N, P) .set Ladv$N$P,L(N)-L(P); .byte 2, Ladv$N$P +/* For historical reasons, the EH reg numbers for SP and FP are swapped from + the DWARF ones for 32b Darwin. */ +# define SP 5 +# define FP 4 +# define ENC 0x10 +#else +# define LEN(N, P) .long L(N)-L(P) +/* Assume DW_CFA_advance_loc1 fits. */ +# define ADV(N, P) .byte 2, L(N)-L(P) +# define SP 4 +# define FP 5 +# define ENC 0x1b +#endif + +#ifdef HAVE_AS_X86_PCREL +# define PCREL(X) X-. +#else +# define PCREL(X) X@rel +#endif #ifdef __APPLE__ .section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support @@ -928,17 +975,11 @@ EHFrame0: #else .section .eh_frame,EH_FRAME_FLAGS,@progbits #endif - -#ifdef HAVE_AS_X86_PCREL -# define PCREL(X) X - . -#else -# define PCREL(X) X@rel +#ifndef __APPLE__ +/* EH sections are already suitably aligned on Darwin. */ + .balign 4 #endif -/* Simplify advancing between labels. Assume DW_CFA_advance_loc1 fits. */ -#define ADV(N, P) .byte 2, L(N)-L(P) - - .balign 4 L(CIE): .set L(set0),L(ECIE)-L(SCIE) .long L(set0) /* CIE Length */ @@ -950,8 +991,8 @@ L(SCIE): .byte 0x7c /* CIE Data Alignment Factor */ .byte 0x8 /* CIE RA Column */ .byte 1 /* Augmentation size */ - .byte 0x1b /* FDE Encoding (pcrel sdata4) */ - .byte 0xc, 4, 4 /* DW_CFA_def_cfa, %esp offset 4 */ + .byte ENC /* FDE Encoding (pcrel abs/4byte) */ + .byte 0xc, SP, 4 /* DW_CFA_def_cfa, %esp offset 4 */ .byte 0x80+8, 1 /* DW_CFA_offset, %eip offset 1*-4 */ .balign 4 L(ECIE): @@ -959,20 +1000,20 @@ L(ECIE): .set L(set1),L(EFDE1)-L(SFDE1) .long L(set1) /* FDE Length */ L(SFDE1): - .long L(SFDE1)-L(CIE) /* FDE CIE offset */ + LEN(SFDE1, CIE) /* FDE CIE offset */ .long PCREL(L(UW0)) /* Initial location */ - .long L(UW5)-L(UW0) /* Address range */ + LEN(UW5, UW0) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW1, UW0) - .byte 0xc, 5, 8 /* DW_CFA_def_cfa, %ebp 8 */ - .byte 0x80+5, 2 /* DW_CFA_offset, %ebp 2*-4 */ + .byte 0xc, FP, 8 /* DW_CFA_def_cfa, %ebp 8 */ + .byte 0x80+FP, 2 /* DW_CFA_offset, %ebp 2*-4 */ ADV(UW2, UW1) .byte 0x80+3, 0 /* DW_CFA_offset, %ebx 0*-4 */ ADV(UW3, UW2) .byte 0xa /* DW_CFA_remember_state */ - .byte 0xc, 4, 4 /* DW_CFA_def_cfa, %esp 4 */ + .byte 0xc, SP, 4 /* DW_CFA_def_cfa, %esp 4 */ .byte 0xc0+3 /* DW_CFA_restore, %ebx */ - .byte 0xc0+5 /* DW_CFA_restore, %ebp */ + .byte 0xc0+FP /* DW_CFA_restore, %ebp */ ADV(UW4, UW3) .byte 0xb /* DW_CFA_restore_state */ .balign 4 @@ -981,9 +1022,9 @@ L(EFDE1): .set L(set2),L(EFDE2)-L(SFDE2) .long L(set2) /* FDE Length */ L(SFDE2): - .long L(SFDE2)-L(CIE) /* FDE CIE offset */ + LEN(SFDE2, CIE) /* FDE CIE offset */ .long PCREL(L(UW6)) /* Initial location */ - .long L(UW8)-L(UW6) /* Address range */ + LEN(UW8,UW6) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW7, UW6) .byte 0xe, closure_FS+4 /* DW_CFA_def_cfa_offset */ @@ -993,9 +1034,9 @@ L(EFDE2): .set L(set3),L(EFDE3)-L(SFDE3) .long L(set3) /* FDE Length */ L(SFDE3): - .long L(SFDE3)-L(CIE) /* FDE CIE offset */ + LEN(SFDE3, CIE) /* FDE CIE offset */ .long PCREL(L(UW9)) /* Initial location */ - .long L(UW11)-L(UW9) /* Address range */ + LEN(UW11, UW9) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW10, UW9) .byte 0xe, closure_FS+4 /* DW_CFA_def_cfa_offset */ @@ -1005,9 +1046,9 @@ L(EFDE3): .set L(set4),L(EFDE4)-L(SFDE4) .long L(set4) /* FDE Length */ L(SFDE4): - .long L(SFDE4)-L(CIE) /* FDE CIE offset */ + LEN(SFDE4, CIE) /* FDE CIE offset */ .long PCREL(L(UW12)) /* Initial location */ - .long L(UW20)-L(UW12) /* Address range */ + LEN(UW20, UW12) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW13, UW12) .byte 0xe, closure_FS+4 /* DW_CFA_def_cfa_offset */ @@ -1033,9 +1074,9 @@ L(EFDE4): .set L(set5),L(EFDE5)-L(SFDE5) .long L(set5) /* FDE Length */ L(SFDE5): - .long L(SFDE5)-L(CIE) /* FDE CIE offset */ + LEN(SFDE5, CIE) /* FDE CIE offset */ .long PCREL(L(UW21)) /* Initial location */ - .long L(UW23)-L(UW21) /* Address range */ + LEN(UW23, UW21) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW22, UW21) .byte 0xe, closure_FS+4 /* DW_CFA_def_cfa_offset */ @@ -1045,9 +1086,9 @@ L(EFDE5): .set L(set6),L(EFDE6)-L(SFDE6) .long L(set6) /* FDE Length */ L(SFDE6): - .long L(SFDE6)-L(CIE) /* FDE CIE offset */ + LEN(SFDE6, CIE) /* FDE CIE offset */ .long PCREL(L(UW24)) /* Initial location */ - .long L(UW26)-L(UW24) /* Address range */ + LEN(UW26, UW24) /* Address range */ .byte 0 /* Augmentation size */ .byte 0xe, 8 /* DW_CFA_def_cfa_offset */ .byte 0x80+8, 2 /* DW_CFA_offset %eip, 2*-4 */ @@ -1059,9 +1100,9 @@ L(EFDE6): .set L(set7),L(EFDE7)-L(SFDE7) .long L(set7) /* FDE Length */ L(SFDE7): - .long L(SFDE7)-L(CIE) /* FDE CIE offset */ + LEN(SFDE7, CIE) /* FDE CIE offset */ .long PCREL(L(UW27)) /* Initial location */ - .long L(UW31)-L(UW27) /* Address range */ + LEN(UW31, UW27) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW28, UW27) .byte 0xe, closure_FS+4 /* DW_CFA_def_cfa_offset */ @@ -1073,14 +1114,13 @@ L(SFDE7): #endif .balign 4 L(EFDE7): - #if !FFI_NO_RAW_API .set L(set8),L(EFDE8)-L(SFDE8) .long L(set8) /* FDE Length */ L(SFDE8): - .long L(SFDE8)-L(CIE) /* FDE CIE offset */ + LEN(SFDE8, CIE) /* FDE CIE offset */ .long PCREL(L(UW32)) /* Initial location */ - .long L(UW40)-L(UW32) /* Address range */ + LEN(UW40, UW32) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW33, UW32) .byte 0xe, raw_closure_S_FS+4 /* DW_CFA_def_cfa_offset */ @@ -1102,9 +1142,9 @@ L(EFDE8): .set L(set9),L(EFDE9)-L(SFDE9) .long L(set9) /* FDE Length */ L(SFDE9): - .long L(SFDE9)-L(CIE) /* FDE CIE offset */ + LEN(SFDE9, CIE) /* FDE CIE offset */ .long PCREL(L(UW41)) /* Initial location */ - .long L(UW52)-L(UW41) /* Address range */ + LEN(UW52, UW41) /* Address range */ .byte 0 /* Augmentation size */ ADV(UW42, UW41) .byte 0xe, 0 /* DW_CFA_def_cfa_offset */ @@ -1141,8 +1181,12 @@ L(EFDE9): @feat.00 = 1 #endif -#ifdef __APPLE__ +#if defined(__APPLE__) .subsections_via_symbols +# if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \ + __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1070 && __clang__ +/* compact unwind is not used with GCC at present, was not present before 10.6 + but has some bugs there, so do not emit until 10.7. */ .section __LD,__compact_unwind,regular,debug /* compact unwind for ffi_call_i386 */ @@ -1216,6 +1260,7 @@ L(EFDE9): .long 0x04000000 /* use dwarf unwind info */ .long 0 .long 0 +#endif /* use compact unwind */ #endif /* __APPLE__ */ #endif /* ifndef _MSC_VER */ |