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f3ddd17380
this overhaul further reduces the amount of arch-specific code needed by the dynamic linker and removes a number of assumptions, including: - that symbolic function references inside libc are bound at link time via the linker option -Bsymbolic-functions. - that libc functions used by the dynamic linker do not require access to data symbols. - that static/internal function calls and data accesses can be made without performing any relocations, or that arch-specific startup code handled any such relocations needed. removing these assumptions paves the way for allowing libc.so itself to be built with stack protector (among other things), and is achieved by a three-stage bootstrap process: 1. relative relocations are processed with a flat function. 2. symbolic relocations are processed with no external calls/data. 3. main program and dependency libs are processed with a fully-functional libc/ldso. reduction in arch-specific code is achived through the following: - crt_arch.h, used for generating crt1.o, now provides the entry point for the dynamic linker too. - asm is no longer responsible for skipping the beginning of argv[] when ldso is invoked as a command. - the functionality previously provided by __reloc_self for heavily GOT-dependent RISC archs is now the arch-agnostic stage-1. - arch-specific relocation type codes are mapped directly as macros rather than via an inline translation function/switch statement.
17 lines
560 B
C
17 lines
560 B
C
#define LDSO_ARCH "i386"
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#define REL_SYMBOLIC R_386_32
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#define REL_OFFSET R_386_PC32
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#define REL_GOT R_386_GLOB_DAT
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#define REL_PLT R_386_JMP_SLOT
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#define REL_RELATIVE R_386_RELATIVE
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#define REL_COPY R_386_COPY
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#define REL_DTPMOD R_386_TLS_DTPMOD32
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#define REL_DTPOFF R_386_TLS_DTPOFF32
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#define REL_TPOFF R_386_TLS_TPOFF
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#define REL_TPOFF_NEG R_386_TLS_TPOFF32
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#define REL_TLSDESC R_386_TLS_DESC
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#define CRTJMP(pc,sp) __asm__ __volatile__( \
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"mov %1,%%esp ; jmp *%0" : : "r"(pc), "r"(sp) : "memory" )
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