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Re: [Tinycc-devel] PATCH: Use R_AARCH64_MOVW_UABS_G* instead of R_AARCH6

From: Christian Jullien
Subject: Re: [Tinycc-devel] PATCH: Use R_AARCH64_MOVW_UABS_G* instead of R_AARCH64_CALL26.
Date: Tue, 11 Oct 2016 07:06:07 +0200

Ooooops, I read too fast yesterday on my phone and I omitted your patch bound in mail (I thought it was already pushed).

I’m really sorry AS IT FULLY WORKS (including all possible tests).

 

Many thanks.

 

 

 

From: Tinycc-devel [mailto:address@hidden On Behalf Of Christian Jullien
Sent: mardi 11 octobre 2016 06:47
To: address@hidden
Subject: Re: [Tinycc-devel] PATCH: Use R_AARCH64_MOVW_UABS_G* instead of R_AARCH64_CALL26.

 

Thank you Edmund, but it does not work (see below).

 

Btw, do you know that can ask for an account on GCC Compile Farm Project (see: https://gcc.gnu.org/wiki/CompileFarm)

Here you can have remote access on different machines for free. Among them you have:

 

name   port disk   CPU           Notes

gcc113      500GB  8x2.4 GHz     aarch64 / 32 GB RAM / APM X-Gene Mustang board / Ubuntu 14.04.3 LTS

gcc114      500GB  8x2.4 GHz     aarch64 / 32 GB RAM / APM X-Gene Mustang board / Ubuntu 14.04.3 LTS

gcc115      500GB  8x2.4 GHz     aarch64 / 32 GB RAM / APM X-Gene Mustang board / Ubuntu 14.04.3 LTS

gcc116      500GB  8x2.4 GHz     aarch64 / 32 GB RAM / APM X-Gene Mustang board / Ubuntu 14.04.3 LTS

 

This is where I tested:

 

address@hidden:~/tinycc$ more config.h

/* Automatically generated by configure - do not modify */

#ifndef CONFIG_TCCDIR

# define CONFIG_TCCDIR "/usr/local/lib/tcc"

#endif

#define GCC_MAJOR 4

#define GCC_MINOR 8

#define TCC_VERSION "0.9.26"

address@hidden:~/tinycc$ export LD_LIBRARY_PATH=/usr/local/lib/tcc

address@hidden:~/tinycc$ ./configure

Binary  directory   /usr/local/bin

TinyCC directory    /usr/local/lib/tcc

Library directory   /usr/local/lib

Include directory   /usr/local/include

Manual directory    /usr/local/share/man

Info directory      /usr/local/share/info

Doc directory       /usr/local/share/doc

Target root prefix

Source path         /home/jullien/tinycc

C compiler          gcc

Target OS           Linux

CPU                 aarch64

Big Endian          no

gprof enabled       no

cross compilers     no

use libgcc          no

Creating config.mak and config.h

config.h is unchanged

address@hidden:~/tinycc$ make

gcc -o tcc.o -c tcc.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR="\"aarch64-

linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-statement -Wno-

deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare

-Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

gcc -o libtcc.o -c libtcc.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR="\"aa

rch64-linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-statement

-Wno-deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-c

ompare -Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

gcc -o tccpp.o -c tccpp.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR="\"aarc

h64-linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-statement -

Wno-deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-com

pare -Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

gcc -o tccgen.o -c tccgen.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR="\"aa

rch64-linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-statement

-Wno-deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-c

ompare -Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

gcc -o tccelf.o -c tccelf.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR="\"aa

rch64-linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-statement

-Wno-deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-c

ompare -Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

gcc -o tccasm.o -c tccasm.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR="\"aa

rch64-linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-statement

-Wno-deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-c

ompare -Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

gcc -o tccrun.o -c tccrun.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR="\"aa

rch64-linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-statement

-Wno-deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-c

ompare -Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

gcc -o arm64-gen.o -c arm64-gen.c -DCONFIG_LDDIR="\"lib\"" -DCONFIG_MULTIARCHDIR

="\"aarch64-linux-gnu\"" -DTCC_TARGET_ARM64 -Wall -g -O2 -Wdeclaration-after-sta

tement -Wno-deprecated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-

sign-compare -Wno-unused-result -Wno-uninitialized -fno-strict-aliasing -I.

ar rcs libtcc.a libtcc.o tccpp.o tccgen.o tccelf.o tccasm.o tccrun.o arm64-gen.o

 

gcc -o tcc tcc.o libtcc.a -Wall -g -O2 -Wdeclaration-after-statement -Wno-deprec

ated-declarations -Wno-strict-aliasing -Wno-pointer-sign -Wno-sign-compare -Wno-

unused-result -Wno-uninitialized -fno-strict-aliasing -I.  -lm -ldl

make -C lib native

make[1]: Entering directory `/home/jullien/tinycc/lib'

ar rcs ../libtcc1.a arm64/lib-arm64.o

make[1]: Leaving directory `/home/jullien/tinycc/lib'

address@hidden:~/tinycc$ make test

make -C tests

make[1]: Entering directory `/home/jullien/tinycc/tests'

------------ hello-exe ------------

../tcc -B.. -I../include -I.. -I.. ../examples/ex1.c -o hello || (../tcc -vv; ex

it 1) && ./hello

Hello World

------------ hello-run ------------

../tcc -B.. -I../include -I.. -I.. -run ../examples/ex1.c

Hello World

gcc -o libtcc_test libtcc_test.c ../libtcc.a -I.. -I.. -lm -ldl

------------ libtest ------------

./libtcc_test -B.. -I../include -I.. -I..

tcc: error: R_AARCH64_(JUMP|CALL)26 relocation failed (val=27c4e7cc, addr=401b10

)

make[1]: *** [libtest] Error 1

 

-----Original Message-----

From: Tinycc-devel [mailto:address@hidden] On Behalf Of Edmund Grimley Evans

Sent: lundi 10 octobre 2016 22:18

To: address@hidden

Subject: [Tinycc-devel] PATCH: Use R_AARCH64_MOVW_UABS_G* instead of R_AARCH64_CALL26.

 

I'll push this in about 24 hours if nobody objects. TCC might work on the "APM X-Gene Mustang board / Ubuntu 14.04.3 LTS" with this.

 

    Use R_AARCH64_MOVW_UABS_G* instead of R_AARCH64_CALL26.

   

    This is a work-around for TCC's linker not building a PLT when TCC is

    invoked with "-run".

 

diff --git a/arm64-gen.c b/arm64-gen.c

index f9f9581..5f52e1f 100644

--- a/arm64-gen.c

+++ b/arm64-gen.c

@@ -592,13 +592,22 @@ ST_FUNC void store(int r, SValue *sv)

 

 static void arm64_gen_bl_or_b(int b)

{

+    // Currently TCC's linker does not generate a PLT when TCC is invoked

+    // with "-run". This means functions can be out of range if we try to

+    // call them in the usual way. Until the linker is fixed, work around

+    // this by using R_AARCH64_MOVW_UABS_G* relocations; see arm64_sym.

+    int avoid_call26 = 1;

+

     if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {

-        assert(!b);

-        if (vtop->r & VT_SYM)

+        assert(!b && (vtop->r & VT_SYM));

+        if (avoid_call26) {

+            arm64_sym(30, vtop->sym, 0);

+            o(0xd63f03c0); // blr x30

+        }

+        else {

             greloc(cur_text_section, vtop->sym, ind, R_AARCH64_CALL26);

-        else

-            assert(0);

-        o(0x94000000); // bl .

+            o(0x94000000); // bl .

+        }

     }

     else

         o(0xd61f0000 | (uint32_t)!b << 21 | intr(gv(RC_R30)) << 5); // br/blr

 

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