Commit Graph

11 Commits (meesbs)

Author SHA1 Message Date
Larry Doolittle 19d8b8a173 Spelling fixes in C comments only 2017-05-07 21:38:09 -07:00
Michael Matz 680e84fe42 elf: Support STB_LOCAL dynamic symbols
local symbols can be resolved statically, they don't have to be
done dynamically, so this is a slight speedup at load time for
produced executables and shared libs.  The musl libc also rejects
any STB_LOCAL symbols for dynamic symbol resolution, so there it
also fixes use of shared libs created by tcc.
2017-05-07 04:41:40 +02:00
Andrei Warkentin 63b2f907bd tcc: fixup clang warnings
The O(xxx) stuff in i386-asm.c had me scratching my head. Extracting
the macro and trying it out in a separate program doesn't give
me any warnings, so I'm confused about what could be going on there.
Any cast will make things happy. I used a uint64_t to catch actual
cases of overflow, which will still cause a -Wconstant-conversion
warning.

Signed-off-by: Andrei Warkentin <andrey.warkentin@gmail.com>
2017-04-25 13:55:18 +03:00
grischka ca92bfc3c6 tccelf: some linker cleanup
- generate and use SYM@PLT for plt addresses
- get rid of patch_dynsym_undef hack (no idea what it did on FreeBSD)
- use sym_attrs instead of symtab_to_dynsym
- special case for function pointers into .so on i386
- libtcc_test: test tcc_add_symbol with data object
- move target specicic code to *-link.c files
- add R_XXX_RELATIVE (needed for PE)
2016-12-15 17:01:22 +01:00
Thomas Preud'homme fe6453f8f0 Use functions to get relocation info
MSVC does not support array designator so cannot compile source using
relocs_info. This commit replace the relocs_info array into a set of
functions, each returning the value given by a given field of the struct
reloc_info.
2016-12-10 18:14:10 +00:00
Thomas Preud'homme d31226c873 Remove now useless pltoff_addend reloc info
Last use for pltoff_addend field of relocs_info array was removed in
commit 25927df3b7. It is now useless so
this commit removes it and all initialization related to it.
2016-12-10 18:13:23 +00:00
Thomas Preud'homme ee2108d07d Add missing relocation info for C67 target
Fill in relocs_info table for C67 and fix R_C60_NUM value to really be
greater than all relocation values known to TCC.
2016-12-10 17:31:20 +00:00
Thomas Preud'homme 0bf262864c Fix PLT creation for i386
i386 target does not have PC relative loads. Its ABI therefore require
ebx register to points to the GOT when executing a PLT entry. This means
that PLT entry cannot be used transparently, the compiler needs to
expect execution of a PLT entry to be able to use one, that is a PLT
entry should only be created if the relocation explicitely asks for it
(eg. R_386_PLT32).

This patch creates a new target macro PCRELATIVE_DLLPLT to indicate
whether a target can do a PC relative load in PLT entry when building a
dynamic library. Executable do not normally pose a problem because they
are loaded at a fixed address and thus the absolute address of GOT can
be used.

Note that in such a case, if the compiler does not use a PLT aware
relocation for external access then the code relocation will fall on the
dynamic loader since there is no PLT entry to relocate too.
2016-12-10 09:44:09 +00:00
Thomas Preud'homme 557c5c1f11 Add relocs_info array to c67 backend 2016-12-05 20:52:02 +00:00
Thomas Preud'homme 59391d5520 Fix relocs_info declaration in tcc.h
C standard specifies that array should be declared with a non null size
or with * for standard array. Declaration of relocs_info in tcc.h was
not respecting this rule. This commit add a R_NUM macro that maps to the
R_<ARCH>_NUM macros and declare relocs_info using it. This commit also
moves all linker-related macros from <arch>-gen.c files to <arch>-link.c
ones.
2016-12-05 20:51:10 +00:00
Thomas Preud'homme cb273fdad8 Do section relocation in architecture backend 2016-12-03 17:26:51 +00:00