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| author | Ulrich Weigand <Ulrich.Weigand@de.ibm.com> | 2013-12-04 06:49:15 -0600 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-12-04 07:41:38 -0600 |
| commit | d31beafa8e4ca69faa4cf362784796ef17299341 (patch) | |
| tree | c19f21db80ede177c9205a7bb5749a5d3fdcda4c /sysdeps/powerpc/powerpc64/sysdep.h | |
| parent | b525166bb93b060e1146f0263b76a9c1e7455b06 (diff) | |
| download | glibc-d31beafa8e4ca69faa4cf362784796ef17299341.zip glibc-d31beafa8e4ca69faa4cf362784796ef17299341.tar.gz glibc-d31beafa8e4ca69faa4cf362784796ef17299341.tar.bz2 | |
PowerPC64 ELFv2 ABI 1/6: Code refactoring
This is the first patch to support the new ELFv2 ABI in glibc.
As preparation, this patch simply refactors some of the powerpc64 assembler
code to move all code related to creating function descriptors (.opd section)
or using function descriptors (function pointer call) into a central place
in sysdep.h.
Note that most locations creating .opd entries were already using macros
in sysdep.h, this patch simply extends this to the remaining places.
No relevant change in generated code expected.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/sysdep.h')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/sysdep.h | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/sysdeps/powerpc/powerpc64/sysdep.h b/sysdeps/powerpc/powerpc64/sysdep.h index 57fa8ba..cc89b3c 100644 --- a/sysdeps/powerpc/powerpc64/sysdep.h +++ b/sysdeps/powerpc/powerpc64/sysdep.h @@ -74,6 +74,14 @@ #endif .endm +/* Macro to prepare for calling via a function pointer. */ + .macro PPC64_LOAD_FUNCPTR PTR + ld r12,0(\PTR) + ld r2,8(\PTR) + mtctr r12 + ld r11,16(\PTR) + .endm + #ifdef USE_PPC64_OVERLAPPING_OPD # define OPD_ENT(name) .quad BODY_LABEL (name), .TOC.@tocbase #else @@ -81,7 +89,6 @@ #endif #define ENTRY_1(name) \ - .section ".text"; \ .type BODY_LABEL(name),@function; \ .globl name; \ .section ".opd","aw"; \ @@ -110,6 +117,7 @@ name##: OPD_ENT (name); \ #endif #define ENTRY(name) \ + .section ".text"; \ ENTRY_2(name) \ .align ALIGNARG(2); \ BODY_LABEL(name): \ @@ -127,6 +135,7 @@ BODY_LABEL(name): \ /* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes past a 2^alignt boundary. */ #define EALIGN(name, alignt, words) \ + .section ".text"; \ ENTRY_2(name) \ .align ALIGNARG(alignt); \ EALIGN_W_##words; \ @@ -286,24 +295,42 @@ LT_LABELSUFFIX(name,_name_end): ; \ #else /* !__ASSEMBLER__ */ +#define PPC64_LOAD_FUNCPTR(ptr) \ + "ld 12,0(" #ptr ");\n" \ + "ld 2,8(" #ptr ");\n" \ + "mtctr 12;\n" \ + "ld 11,16(" #ptr ");" + #ifdef USE_PPC64_OVERLAPPING_OPD # define OPD_ENT(name) ".quad " BODY_PREFIX #name ", .TOC.@tocbase;" #else # define OPD_ENT(name) ".quad " BODY_PREFIX #name ", .TOC.@tocbase, 0;" #endif +#define ENTRY_1(name) \ + ".type " BODY_PREFIX #name ",@function;\n" \ + ".globl " #name ";\n" \ + ".pushsection \".opd\",\"aw\";\n" \ + ".align 3;\n" \ +#name ":\n" \ + OPD_ENT (name) "\n" \ + ".popsection;" + #ifdef HAVE_ASM_GLOBAL_DOT_NAME # define DOT_PREFIX "." # define BODY_PREFIX "." # define ENTRY_2(name) \ ".globl " BODY_PREFIX #name ";\n" \ + ENTRY_1(name) "\n" \ ".size " #name ", 24;" # define END_2(name) \ ".size " BODY_PREFIX #name ",.-" BODY_PREFIX #name ";" #else # define DOT_PREFIX "" # define BODY_PREFIX ".LY" -# define ENTRY_2(name) ".type " #name ",@function;" +# define ENTRY_2(name) \ + ".type " #name ",@function;\n" \ + ENTRY_1(name) # define END_2(name) \ ".size " #name ",.-" BODY_PREFIX #name ";\n" \ ".size " BODY_PREFIX #name ",.-" BODY_PREFIX #name ";" |