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Thomas Preud'homme 25927df3b7 Consolidate all relocations in relocate_section
Static relocation of functions in dynamic libraries must use the PLT
entry as the target. Before this commit, it used to be done in 2 parts
for ARM, with the offset of the PLT entry from the beginning of the PLT
being put in the relocated place in build_got_entries () and then the
address of the PLT being added in relocate_section.

This led to code dealing with reading the offset of a bl instruction in
build_got_entries. Furthermore, the addition of the address of the start
of the PLT was done based on the relocation type which does not convey
whether a PLT entry should be used to reach the symbol.

This commit moves the decision to use the PLT as the target in
relocate_section, therefore having the instruction aware code contained
to the target-specific bit of that function (in <target>-link.c).

Note that relocate_syms is *not* the right place to do this because two
different relocations for the same symbol can make different decision.
This is the case in tcc -run mode where the static and dynamic
relocation are done by tcc.

Storing the PLT entry address in the symbol's st_value field and relying
on the specific relocation type being used for dynamic relocation would
work but the PLT entry address would then appear in the static symbol
table (symtab). This would also make the static symbol table entry
differ from the dynamic symbol table entry.
2016-12-03 17:26:51 +00:00
examples
include Avoid conflicting definition for va_list on 64-bit Macs 2016-08-04 13:14:52 -04:00
lib Remove warning when __builtin_frame_address is used with gcc >= 6. 2016-11-30 06:18:48 +01:00
tests Implement gcc bitfield algorithm; add -mms-bitfields 2016-11-28 09:01:12 -05:00
win32 tccrun/win64: cleanup runtime function table 2016-10-19 19:21:27 +02:00
.gitignore Move utility functions trimfront/back to tccpp.c 2016-04-13 14:33:21 +03:00
arm64-gen.c Make build_got_entries more target independent 2016-12-03 17:26:51 +00:00
arm64-link.c Consolidate all relocations in relocate_section 2016-12-03 17:26:51 +00:00
arm-gen.c Make build_got_entries more target independent 2016-12-03 17:26:51 +00:00
arm-link.c Consolidate all relocations in relocate_section 2016-12-03 17:26:51 +00:00
c67-gen.c Make build_got_entries more target independent 2016-12-03 17:26:51 +00:00
c67-link.c Do section relocation in architecture backend 2016-12-03 17:26:51 +00:00
Changelog Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
CodingStyle CodingStyle: Remove reference to misaligned struct CString. 2016-01-06 19:09:28 +00:00
coff.h Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
configure configure: prefer lib64 on 64-bit platforms 2016-11-28 14:48:54 +01:00
conftest.c Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
COPYING
elf.h tccgen: scopes levels for local symbols (update 1) 2016-05-05 20:04:00 +02:00
i386-asm.c tccelf: introduce add32/64le() 2016-11-20 14:52:56 +01:00
i386-asm.h x86-asm: Reject some invalid arith imm8 instruction 2016-05-16 05:10:21 +02:00
i386-gen.c Make build_got_entries more target independent 2016-12-03 17:26:51 +00:00
i386-link.c Make build_got_entries more target independent 2016-12-03 17:26:51 +00:00
i386-tok.h x86_64-asm: =m operand fixes 2016-11-20 14:50:56 +01:00
il-gen.c Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
il-opcodes.h Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
libtcc.c Do section relocation in architecture backend 2016-12-03 17:26:51 +00:00
libtcc.h libtcc: filetype cleanup 2016-10-01 20:46:16 +02:00
Makefile Do section relocation in architecture backend 2016-12-03 17:26:51 +00:00
README
RELICENSING Adding two more people to the RELICENSING file. 2015-07-31 16:56:23 -04:00
stab.def Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
stab.h Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
tcc-doc.texi Implement gcc bitfield algorithm; add -mms-bitfields 2016-11-28 09:01:12 -05:00
tcc.c Implement gcc bitfield algorithm; add -mms-bitfields 2016-11-28 09:01:12 -05:00
tcc.h Allow to get sym attr and fail if no entry 2016-12-03 17:26:51 +00:00
tccasm.c x86_64-asm: =m operand fixes 2016-11-20 14:50:56 +01:00
tcccoff.c Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
tccelf.c Consolidate all relocations in relocate_section 2016-12-03 17:26:51 +00:00
tccgen.c Rename add_elf_sym to set_elf_sym 2016-12-03 17:26:51 +00:00
tcclib.h Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
tccpe.c Rename add_elf_sym to set_elf_sym 2016-12-03 17:26:51 +00:00
tccpp.c tccgen: fix inline_functions double free fix 2016-11-11 20:25:13 +01:00
tccrun.c x86_64-asm: =m operand fixes 2016-11-20 14:50:56 +01:00
tcctok.h lib/libtcc1.c: cleanup 2016-10-19 19:21:36 +02:00
texi2pod.pl Revert all of my changes to directories & codingstyle. 2015-07-29 16:57:12 -04:00
TODO Insert spaces between certain tokens when tcc is invoked with -E. 2016-05-09 19:27:31 +01:00
VERSION
x86_64-asm.h x86-asm: Reject some invalid arith imm8 instruction 2016-05-16 05:10:21 +02:00
x86_64-gen.c Make build_got_entries more target independent 2016-12-03 17:26:51 +00:00
x86_64-link.c Consolidate all relocations in relocate_section 2016-12-03 17:26:51 +00:00

Tiny C Compiler - C Scripting Everywhere - The Smallest ANSI C compiler
-----------------------------------------------------------------------

Features:
--------

- SMALL! You can compile and execute C code everywhere, for example on
  rescue disks.

- FAST! tcc generates optimized x86 code. No byte code
  overhead. Compile, assemble and link about 7 times faster than 'gcc
  -O0'.

- UNLIMITED! Any C dynamic library can be used directly. TCC is
  heading torward full ISOC99 compliance. TCC can of course compile
  itself.

- SAFE! tcc includes an optional memory and bound checker. Bound
  checked code can be mixed freely with standard code.

- Compile and execute C source directly. No linking or assembly
  necessary. Full C preprocessor included. 

- C script supported : just add '#!/usr/local/bin/tcc -run' at the first
  line of your C source, and execute it directly from the command
  line.

Documentation:
-------------

1) Installation on a i386/x86_64/arm Linux/OSX/FreeBSD host (for Windows read tcc-win32.txt)

Note: For OSX and FreeBSD, gmake should be used instead of make.

   ./configure
   make
   make test
   make install

Alternatively, out-of-tree builds are supported: you may use different
directories to hold build objects, kept separate from your source tree:

   mkdir _build
   cd _build
   ../configure
   make
   make test
   make install

Texi2html must be installed to compile the doc. 
By default, tcc is installed in /usr/local/bin.
./configure --help  shows configuration options.


2) Introduction

We assume here that you know ANSI C. Look at the example ex1.c to know
what the programs look like.

The include file <tcclib.h> can be used if you want a small basic libc
include support (especially useful for floppy disks). Of course, you
can also use standard headers, although they are slower to compile.

You can begin your C script with '#!/usr/local/bin/tcc -run' on the first
line and set its execute bits (chmod a+x your_script). Then, you can
launch the C code as a shell or perl script :-) The command line
arguments are put in 'argc' and 'argv' of the main functions, as in
ANSI C.

3) Examples

ex1.c: simplest example (hello world). Can also be launched directly
as a script: './ex1.c'.

ex2.c: more complicated example: find a number with the four
operations given a list of numbers (benchmark).

ex3.c: compute fibonacci numbers (benchmark).

ex4.c: more complicated: X11 program. Very complicated test in fact
because standard headers are being used ! As for ex1.c, can also be launched
directly as a script: './ex4.c'.

ex5.c: 'hello world' with standard glibc headers.

tcc.c: TCC can of course compile itself. Used to check the code
generator.

tcctest.c: auto test for TCC which tests many subtle possible bugs. Used
when doing 'make test'.

4) Full Documentation

Please read tcc-doc.html to have all the features of TCC.

Additional information is available for the Windows port in tcc-win32.txt.

License:
-------

TCC is distributed under the GNU Lesser General Public License (see
COPYING file).

Fabrice Bellard.