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696caf1d00
This patch adds support for the ELFv2 ABI feature to remove function descriptors. See this GCC patch for in-depth discussion: http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01141.html This mostly involves two types of changes: updating assembler source files to the new logic, and updating the dynamic loader. After the refactoring in the previous patch, most of the assembler source changes can be handled simply by providing ELFv2 versions of the macros in sysdep.h. One somewhat non-obvious change is in __GI__setjmp: this used to "fall through" to the immediately following __setjmp ENTRY point. This is no longer safe in the ELFv2 since ENTRY defines both a global and a local entry point, and you cannot simply fall through to a global entry point as it requires r12 to be set up. Also, makecontext needs to be updated to set up registers according to the new ABI for calling into the context's start routine. The dynamic linker changes mostly consist of removing special code to handle function descriptors. We also need to support the new PLT and glink format used by the the ELFv2 linker, see: https://sourceware.org/ml/binutils/2013-10/msg00376.html In addition, the dynamic linker now verifies that the dynamic libraries it loads match its own ABI. The hack in VDSO_IFUNC_RET to "synthesize" a function descriptor for vDSO routines is also no longer necessary for ELFv2.
390 lines
9.3 KiB
C
390 lines
9.3 KiB
C
/* Assembly macros for 64-bit PowerPC.
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Copyright (C) 2002-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdeps/powerpc/sysdep.h>
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#ifdef __ASSEMBLER__
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/* Support macros for CALL_MCOUNT. */
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.macro SAVE_ARG NARG
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.if \NARG
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SAVE_ARG \NARG-1
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std 2+\NARG,40+8*(\NARG)(1)
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.endif
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.endm
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.macro REST_ARG NARG
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.if \NARG
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REST_ARG \NARG-1
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ld 2+\NARG,112+40+8*(\NARG)(1)
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.endif
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.endm
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.macro CFI_SAVE_ARG NARG
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.if \NARG
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CFI_SAVE_ARG \NARG-1
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cfi_offset(2+\NARG,40+8*(\NARG))
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.endif
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.endm
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.macro CFI_REST_ARG NARG
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.if \NARG
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CFI_REST_ARG \NARG-1
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cfi_restore(2+\NARG)
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.endif
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.endm
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/* If compiled for profiling, call `_mcount' at the start of each function.
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see ppc-mcount.S for more details. */
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.macro CALL_MCOUNT NARG
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#ifdef PROF
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mflr r0
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SAVE_ARG \NARG
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std r0,16(r1)
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stdu r1,-112(r1)
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cfi_adjust_cfa_offset(112)
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cfi_offset(lr,16)
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CFI_SAVE_ARG \NARG
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bl JUMPTARGET (_mcount)
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#ifndef SHARED
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nop
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#endif
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ld r0,128(r1)
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REST_ARG \NARG
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mtlr r0
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addi r1,r1,112
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cfi_adjust_cfa_offset(-112)
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cfi_restore(lr)
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CFI_REST_ARG \NARG
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#endif
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.endm
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#if _CALL_ELF != 2
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/* Macro to prepare for calling via a function pointer. */
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.macro PPC64_LOAD_FUNCPTR PTR
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ld r12,0(\PTR)
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ld r2,8(\PTR)
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mtctr r12
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ld r11,16(\PTR)
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.endm
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#ifdef USE_PPC64_OVERLAPPING_OPD
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# define OPD_ENT(name) .quad BODY_LABEL (name), .TOC.@tocbase
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#else
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# define OPD_ENT(name) .quad BODY_LABEL (name), .TOC.@tocbase, 0
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#endif
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#define ENTRY_1(name) \
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.type BODY_LABEL(name),@function; \
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.globl name; \
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.section ".opd","aw"; \
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.align 3; \
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name##: OPD_ENT (name); \
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.previous;
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#ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# define DOT_LABEL(X) .##X
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# define BODY_LABEL(X) .##X
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# define ENTRY_2(name) \
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.globl BODY_LABEL(name); \
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ENTRY_1(name) \
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.size name, 24;
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# define END_2(name) \
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.size BODY_LABEL(name),.-BODY_LABEL(name);
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#else
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# define DOT_LABEL(X) X
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# define BODY_LABEL(X) .LY##X
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# define ENTRY_2(name) \
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.type name,@function; \
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ENTRY_1(name)
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# define END_2(name) \
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.size name,.-BODY_LABEL(name); \
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.size BODY_LABEL(name),.-BODY_LABEL(name);
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#endif
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#define LOCALENTRY(name)
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#else /* _CALL_ELF */
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/* Macro to prepare for calling via a function pointer. */
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.macro PPC64_LOAD_FUNCPTR PTR
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mr r12,\PTR
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mtctr r12
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.endm
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#define DOT_LABEL(X) X
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#define BODY_LABEL(X) X
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#define ENTRY_2(name) \
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.globl name; \
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.type name,@function;
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#define END_2(name) \
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.size name,.-name;
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#define LOCALENTRY(name) \
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1: addis r2,r12,.TOC.-1b@ha; \
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addi r2,r2,.TOC.-1b@l; \
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.localentry name,.-name;
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#endif /* _CALL_ELF */
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#define ENTRY(name) \
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.section ".text"; \
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ENTRY_2(name) \
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.align ALIGNARG(2); \
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BODY_LABEL(name): \
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cfi_startproc; \
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LOCALENTRY(name)
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#define EALIGN_W_0 /* No words to insert. */
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#define EALIGN_W_1 nop
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#define EALIGN_W_2 nop;nop
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#define EALIGN_W_3 nop;nop;nop
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#define EALIGN_W_4 EALIGN_W_3;nop
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#define EALIGN_W_5 EALIGN_W_4;nop
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#define EALIGN_W_6 EALIGN_W_5;nop
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#define EALIGN_W_7 EALIGN_W_6;nop
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/* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
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past a 2^alignt boundary. */
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#define EALIGN(name, alignt, words) \
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.section ".text"; \
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ENTRY_2(name) \
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.align ALIGNARG(alignt); \
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EALIGN_W_##words; \
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BODY_LABEL(name): \
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cfi_startproc; \
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LOCALENTRY(name)
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/* Local labels stripped out by the linker. */
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#undef L
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#define L(x) .L##x
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#define tostring(s) #s
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#define stringify(s) tostring(s)
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#define XGLUE(a,b) a##b
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#define GLUE(a,b) XGLUE(a,b)
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#define LT_LABEL(name) GLUE(.LT,name)
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#define LT_LABELSUFFIX(name,suffix) GLUE(GLUE(.LT,name),suffix)
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/* Support Traceback tables */
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#define TB_ASM 0x000c000000000000
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#define TB_GLOBALLINK 0x0000800000000000
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#define TB_IS_EPROL 0x0000400000000000
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#define TB_HAS_TBOFF 0x0000200000000000
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#define TB_INT_PROC 0x0000100000000000
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#define TB_HAS_CTL 0x0000080000000000
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#define TB_TOCLESS 0x0000040000000000
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#define TB_FP_PRESENT 0x0000020000000000
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#define TB_LOG_ABORT 0x0000010000000000
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#define TB_INT_HANDL 0x0000008000000000
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#define TB_NAME_PRESENT 0x0000004000000000
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#define TB_USES_ALLOCA 0x0000002000000000
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#define TB_SAVES_CR 0x0000000200000000
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#define TB_SAVES_LR 0x0000000100000000
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#define TB_STORES_BC 0x0000000080000000
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#define TB_FIXUP 0x0000000040000000
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#define TB_FP_SAVED(fprs) (((fprs) & 0x3f) << 24)
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#define TB_GPR_SAVED(gprs) (((fprs) & 0x3f) << 16)
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#define TB_FIXEDPARMS(parms) (((parms) & 0xff) << 8)
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#define TB_FLOATPARMS(parms) (((parms) & 0x7f) << 1)
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#define TB_PARMSONSTK 0x0000000000000001
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#define PPC_HIGHER(v) (((v) >> 32) & 0xffff)
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#define TB_DEFAULT TB_ASM | TB_HAS_TBOFF | TB_NAME_PRESENT
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#define TRACEBACK(name) \
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LT_LABEL(name): ; \
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.long 0 ; \
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.quad TB_DEFAULT ; \
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.long LT_LABEL(name)-BODY_LABEL(name) ; \
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.short LT_LABELSUFFIX(name,_name_end)-LT_LABELSUFFIX(name,_name_start) ; \
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LT_LABELSUFFIX(name,_name_start): ;\
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.ascii stringify(name) ; \
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LT_LABELSUFFIX(name,_name_end): ; \
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.align 2 ;
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#define TRACEBACK_MASK(name,mask) \
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LT_LABEL(name): ; \
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.long 0 ; \
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.quad TB_DEFAULT | mask ; \
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.long LT_LABEL(name)-BODY_LABEL(name) ; \
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.short LT_LABELSUFFIX(name,_name_end)-LT_LABELSUFFIX(name,_name_start) ; \
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LT_LABELSUFFIX(name,_name_start): ;\
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.ascii stringify(name) ; \
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LT_LABELSUFFIX(name,_name_end): ; \
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.align 2 ;
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/* END generates Traceback tables */
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#undef END
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#define END(name) \
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cfi_endproc; \
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TRACEBACK(name) \
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END_2(name)
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/* This form supports more informative traceback tables */
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#define END_GEN_TB(name,mask) \
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cfi_endproc; \
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TRACEBACK_MASK(name,mask) \
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END_2(name)
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#define DO_CALL(syscall) \
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li 0,syscall; \
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sc
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/* ppc64 is always PIC */
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#undef JUMPTARGET
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#define JUMPTARGET(name) DOT_LABEL(name)
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#define PSEUDO(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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DO_CALL (SYS_ify (syscall_name));
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#ifdef SHARED
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#define TAIL_CALL_SYSCALL_ERROR \
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b JUMPTARGET(__syscall_error)
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#else
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/* Static version might be linked into a large app with a toc exceeding
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64k. We can't put a toc adjusting stub on a plain branch, so can't
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tail call __syscall_error. */
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#define TAIL_CALL_SYSCALL_ERROR \
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.ifdef .Local_syscall_error; \
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b .Local_syscall_error; \
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.else; \
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.Local_syscall_error: \
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mflr 0; \
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std 0,16(1); \
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stdu 1,-112(1); \
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cfi_adjust_cfa_offset(112); \
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cfi_offset(lr,16); \
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bl JUMPTARGET(__syscall_error); \
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nop; \
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ld 0,112+16(1); \
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addi 1,1,112; \
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cfi_adjust_cfa_offset(-112); \
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mtlr 0; \
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cfi_restore(lr); \
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blr; \
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.endif
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#endif
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#define PSEUDO_RET \
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bnslr+; \
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TAIL_CALL_SYSCALL_ERROR
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#define ret PSEUDO_RET
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END (name)
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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DO_CALL (SYS_ify (syscall_name));
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#define PSEUDO_RET_NOERRNO \
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blr
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#define ret_NOERRNO PSEUDO_RET_NOERRNO
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(name) \
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END (name)
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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DO_CALL (SYS_ify (syscall_name));
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#define PSEUDO_RET_ERRVAL \
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blr
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#define ret_ERRVAL PSEUDO_RET_ERRVAL
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(name) \
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END (name)
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#else /* !__ASSEMBLER__ */
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#if _CALL_ELF != 2
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#define PPC64_LOAD_FUNCPTR(ptr) \
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"ld 12,0(" #ptr ");\n" \
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"ld 2,8(" #ptr ");\n" \
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"mtctr 12;\n" \
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"ld 11,16(" #ptr ");"
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#ifdef USE_PPC64_OVERLAPPING_OPD
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# define OPD_ENT(name) ".quad " BODY_PREFIX #name ", .TOC.@tocbase;"
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#else
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# define OPD_ENT(name) ".quad " BODY_PREFIX #name ", .TOC.@tocbase, 0;"
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#endif
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#define ENTRY_1(name) \
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".type " BODY_PREFIX #name ",@function;\n" \
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".globl " #name ";\n" \
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".pushsection \".opd\",\"aw\";\n" \
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".align 3;\n" \
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#name ":\n" \
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OPD_ENT (name) "\n" \
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".popsection;"
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#ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# define DOT_PREFIX "."
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# define BODY_PREFIX "."
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# define ENTRY_2(name) \
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".globl " BODY_PREFIX #name ";\n" \
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ENTRY_1(name) "\n" \
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".size " #name ", 24;"
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# define END_2(name) \
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".size " BODY_PREFIX #name ",.-" BODY_PREFIX #name ";"
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#else
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# define DOT_PREFIX ""
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# define BODY_PREFIX ".LY"
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# define ENTRY_2(name) \
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".type " #name ",@function;\n" \
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ENTRY_1(name)
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# define END_2(name) \
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".size " #name ",.-" BODY_PREFIX #name ";\n" \
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".size " BODY_PREFIX #name ",.-" BODY_PREFIX #name ";"
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#endif
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#define LOCALENTRY(name)
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#else /* _CALL_ELF */
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#define PPC64_LOAD_FUNCPTR(ptr) \
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"mr 12," #ptr ";\n" \
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"mtctr 12;"
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#define DOT_PREFIX ""
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#define BODY_PREFIX ""
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#define ENTRY_2(name) \
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".type " #name ",@function;\n" \
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".globl " #name ";"
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#define END_2(name) \
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".size " #name ",.-" #name ";"
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#define LOCALENTRY(name) \
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"1: addis 2,12,.TOC.-1b@ha;\n" \
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"addi 2,2,.TOC.-1b@l;\n" \
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".localentry " #name ",.-" #name ";"
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#endif /* _CALL_ELF */
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#endif /* __ASSEMBLER__ */
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