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Building for aarch64 using the aarch64-none-elf-gcc cross-compiler. #191
Description
I'm trying to build this libc implementation for aarch64 using the aarch64-none-elf-gcc cross-compiler.
I modified the arm.txt cross-compiler file in the following (quick and dirty) way:
[binaries]
c = 'aarch64-none-elf-gcc'
cpp = 'aarch64-none-elf-c++'
ar = 'aarch64-none-elf-gcc-ar'
strip = 'aarch64-none-elf-strip'
[properties]
objcopy = 'aarch64-none-elf-objcopy'
get_supported_link_arg_flags = ['--specs=nosys.specs']
needs_exe_wrapper = true
c_args = [ '-mcpu=cortex-a53']
c_link_args = [ '-mcpu=cortex-a53']
cpp_args = [ '-mcpu=cortex-a53']
cpp_link_args = [ '-mcpu=cortex-a53']
[host_machine]
system = 'none'
cpu_family = 'aarch64'
cpu = 'cortex-a53'
endian = 'little'
I then ran the following command:
meson buildresults --cross-file build/cross/arm.txt
And then I ran:
make
However, I got the following compiler error:
ninja: Entering directory `buildresults'
[2/540] Compiling C++ object printf_tests.p/printf_test_test_suite.cpp.o
../printf/test/test_suite.cpp: In function ‘void ____C_A_T_C_H____T_E_S_T____50()’:
../printf/test/test_suite.cpp:346:56: warning: reading through null pointer (argument 4) [-Wformat=]
ret = snprintf_(buffer, 6, "0%s", (const char *) NULL);
^
../printf/test/test_suite_main_testcases.hpp: In function ‘void ____C_A_T_C_H____T_E_S_T____354()’:
../printf/test/test_suite.cpp:88:32: warning: reading through null pointer (argument 3) [-Wformat=]
printer_(buffer_, __VA_ARGS__); \
^
../printf/test/test_suite_main_testcases.hpp:245:3: note: in expansion of macro ‘PRINTING_CHECK’
PRINTING_CHECK("(null)", ==, sprintf_, buffer, "%s", (const char *) nullptr);
^~~~~~~~~~~~~~
../printf/test/test_suite_main_testcases.hpp: In function ‘void ____C_A_T_C_H____T_E_S_T____1552()’:
../printf/test/test_suite.cpp:88:32: warning: reading through null pointer (argument 4) [-Wformat=]
printer_(buffer_, __VA_ARGS__); \
^
../printf/test/test_suite_main_testcases.hpp:937:3: note: in expansion of macro ‘PRINTING_CHECK’
PRINTING_CHECK("(null)", ==, sprintf_, buffer, "%.*s", 3, (const char *) NULL);
^~~~~~~~~~~~~~
In file included from ../printf/test/test_suite.cpp:412:
../printf/test/test_suite_main_testcases.hpp: In function ‘void ____C_A_T_C_H____T_E_S_T____1582()’:
../printf/test/test_suite_main_testcases.hpp:979:49: warning: reading through null pointer (argument 4) [-Wformat=]
snprintf_(buffer, 2, "%s", (const char *) NULL);
^
[43/540] Compiling C object src/libc.a.p/gdtoa_src_misc.c.o
../src/gdtoa/src/misc.c: In function 'multadd':
../src/gdtoa/src/misc.c:180:10: warning: conversion to 'uint64_t' {aka 'long unsigned int'} from 'long long unsigned int' may change the sign of the result [-Wsign-conversion]
180 | carry = (unsigned long long)a;
| ^
[163/540] Compiling C object src/libc.a.p/crt_crt.c.o
../src/crt/crt.c:35:1: warning: 'no_stack_protector' attribute directive ignored [-Wattributes]
35 | {
| ^
../src/crt/crt.c:60:1: warning: 'no_stack_protector' attribute directive ignored [-Wattributes]
60 | {
| ^
[165/540] Compiling C object src/libc.a.p/crt_stack_protection.c.o
../src/crt/stack_protection.c:30:1: warning: 'no_stack_protector' attribute directive ignored [-Wattributes]
30 | {
| ^
[168/540] Compiling C object src/libc.a.p/.._arch_aarch64_src_crt0.S.o
FAILED: src/libc.a.p/.._arch_aarch64_src_crt0.S.o
aarch64-none-elf-gcc -Isrc/libc.a.p -Isrc -I../src -I../include -I../src/gdtoa/include -I../arch/aarch64/include -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -Wpedantic -std=c11 -O2 -fdiagnostics-show-option -ffunction-sections -fdata-sections -fdevirtualize -Wno-unknown-pragmas -Wno-padded -Wfloat-equal -Wconversion -Wlogical-op -Wundef -Wredundant-decls -Wshadow -Wstrict-overflow=2 -Wwrite-strings -Wpointer-arith -Wcast-qual -Wformat=2 -Wformat-truncation -Wmissing-include-dirs -Wcast-align -Wswitch-enum -Wsign-conversion -Wdisabled-optimization -Winvalid-pch -Wmissing-declarations -Wdouble-promotion -Wshadow -Wtrampolines -Wvector-operation-performance -Wshift-overflow=2 -Wnull-dereference -Wduplicated-cond -Wshift-overflow=2 -Wnull-dereference -Wduplicated-cond -Wcast-align=strict -Wno-nonnull -Wno-nonnull-compare -Wno-pedantic -mcpu=cortex-a53 -fPIC -DPRINTF_ALIAS_STANDARD_FUNCTION_NAMES=1 -DPRINTF_INCLUDE_CONFIG_H=0 -isystem../openlibm/src -isystem../openlibm/include -isystem../printf/src -isystem../printf/src/printf -DNO_ERRNO -DIFNAN_CHECK -DGDTOA_NO_ASSERT -DNO_FENV_H -nostdinc -fno-builtin -MD -MQ src/libc.a.p/.._arch_aarch64_src_crt0.S.o -MF src/libc.a.p/.._arch_aarch64_src_crt0.S.o.d -o src/libc.a.p/.._arch_aarch64_src_crt0.S.o -c ../arch/aarch64/src/crt0.S
../arch/aarch64/src/crt0.S:3:5: warning: "__thumb2__" is not defined, evaluates to 0 [-Wundef]
3 | #if __thumb2__ || (__thumb__ && !__ARM_ARCH_ISA_ARM)
| ^~~~~~~~~~
../arch/aarch64/src/crt0.S:3:20: warning: "__thumb__" is not defined, evaluates to 0 [-Wundef]
3 | #if __thumb2__ || (__thumb__ && !__ARM_ARCH_ISA_ARM)
| ^~~~~~~~~
../arch/aarch64/src/crt0.S:8:5: warning: "__ARM_ARCH_ISA_THUMB" is not defined, evaluates to 0 [-Wundef]
8 | #if __ARM_ARCH_ISA_THUMB == 1 && !__ARM_ARCH_ISA_ARM
| ^~~~~~~~~~~~~~~~~~~~
../arch/aarch64/src/crt0.S:16:6: warning: "__ARM_ARCH_ISA_ARM" is not defined, evaluates to 0 [-Wundef]
16 | #if !__ARM_ARCH_ISA_ARM && !__ARM_ARCH_7__
| ^~~~~~~~~~~~~~~~~~
../arch/aarch64/src/crt0.S:16:29: warning: "__ARM_ARCH_7__" is not defined, evaluates to 0 [-Wundef]
16 | #if !__ARM_ARCH_ISA_ARM && !__ARM_ARCH_7__
| ^~~~~~~~~~~~~~
../arch/aarch64/src/crt0.S:217:5: warning: "__thumb__" is not defined, evaluates to 0 [-Wundef]
217 | #if __thumb__ && !defined(PREFER_THUMB)
| ^~~~~~~~~
../arch/aarch64/src/crt0.S: Assembler messages:
../arch/aarch64/src/crt0.S:65: Error: unknown pseudo-op: `.syntax'
../arch/aarch64/src/crt0.S:74: Error: unknown pseudo-op: `.code'
../arch/aarch64/src/crt0.S:95: Error: unknown pseudo-op: `.fnstart'
../arch/aarch64/src/crt0.S:111: Error: operand 1 must be an integer register -- `ldr r3,.Lstack'
../arch/aarch64/src/crt0.S:112: Error: operand 1 must be an integer or stack pointer register -- `cmp r3,#0'
../arch/aarch64/src/crt0.S:121: Error: unknown mnemonic `ldreq' -- `ldreq r3,.LC0'
../arch/aarch64/src/crt0.S:131: Error: operand 1 must be an integer register -- `mrs r2,CPSR'
../arch/aarch64/src/crt0.S:132: Error: operand 1 must be an integer register -- `tst r2,#0x0F'
../arch/aarch64/src/crt0.S:134: Error: unknown or missing system register name at operand 1 -- `msr CPSR_c,#0xD1'
../arch/aarch64/src/crt0.S:136: Error: operand 1 must be an integer or stack pointer register -- `sub sl,sp,#0x1000'
../arch/aarch64/src/crt0.S:138: Error: operand 1 must be an integer register -- `mov r3,sl'
../arch/aarch64/src/crt0.S:139: Error: unknown or missing system register name at operand 1 -- `msr CPSR_c,#0xD7'
../arch/aarch64/src/crt0.S:141: Error: operand 1 must be an integer or stack pointer register -- `sub r3,r3,#0x1000'
../arch/aarch64/src/crt0.S:143: Error: unknown or missing system register name at operand 1 -- `msr CPSR_c,#0xDB'
../arch/aarch64/src/crt0.S:145: Error: operand 1 must be an integer or stack pointer register -- `sub r3,r3,#0x1000'
../arch/aarch64/src/crt0.S:147: Error: unknown or missing system register name at operand 1 -- `msr CPSR_c,#0xD2'
../arch/aarch64/src/crt0.S:149: Error: operand 1 must be an integer or stack pointer register -- `sub r3,r3,#0x2000'
../arch/aarch64/src/crt0.S:151: Error: unknown or missing system register name at operand 1 -- `msr CPSR_c,#0xD3'
../arch/aarch64/src/crt0.S:154: Error: operand 1 must be an integer or stack pointer register -- `sub r3,r3,#0x8000'
../arch/aarch64/src/crt0.S:155: Error: operand 1 must be a SIMD vector register -- `bic r3,r3,#0x00FF'
../arch/aarch64/src/crt0.S:156: Error: operand 1 must be a SIMD vector register -- `bic r3,r3,#0xFF00'
../arch/aarch64/src/crt0.S:158: Error: operand 1 must be an integer register -- `str r3,[r3,#-4]'
../arch/aarch64/src/crt0.S:159: Error: unknown mnemonic `ldmdb' -- `ldmdb r3,{sp}^'
../arch/aarch64/src/crt0.S:160: Error: operand 1 must be a SIMD vector register -- `orr r2,r2,#0xC0'
../arch/aarch64/src/crt0.S:161: Error: unknown or missing system register name at operand 1 -- `msr CPSR_c,r2'
../arch/aarch64/src/crt0.S:177: Error: operand 1 must be an integer or stack pointer register -- `sub sl,r3,#64<<10'
../arch/aarch64/src/crt0.S:206: Error: operand 1 must be an SVE predicate register -- `movs r0,#0'
../arch/aarch64/src/crt0.S:207: Error: operand 1 must be an SVE predicate register -- `movs r1,#0'
../arch/aarch64/src/crt0.S:263: Error: unknown pseudo-op: `.cantunwind'
../arch/aarch64/src/crt0.S:264: Error: unknown pseudo-op: `.fnend'
../arch/aarch64/src/crt0.S:127: Error: undefined symbol r3 used as an immediate value
../arch/aarch64/src/crt0.S:135: Error: undefined symbol r3 used as an immediate value
../arch/aarch64/src/crt0.S:140: Error: undefined symbol r3 used as an immediate value
../arch/aarch64/src/crt0.S:144: Error: undefined symbol r3 used as an immediate value
../arch/aarch64/src/crt0.S:148: Error: undefined symbol r3 used as an immediate value
../arch/aarch64/src/crt0.S:153: Error: undefined symbol r3 used as an immediate value
[173/540] Compiling C object src/libc.a.p/.._printf_src_printf_printf.c.o
ninja: build stopped: subcommand failed.
Makefile:56: recipe for target 'default' failed
make: *** [default] Error 1
As per the the compiler error, it seems that the assembly code in crt0.S is invalid for aarch64.
I then came across the following issues regarding aarch64:
Is my understanding correct that this repo isn't ready to be built for aarch64 yet? If it is possible to compile for aarch64, I would really appreciate it if you could let me know how!
Activity
phillipjohnston commentedon May 21, 2023
Sorry for the delay. It is not ready, but I thought it was more ready than that. I will need to go over my branches this week, maybe I missed a merge.
phillipjohnston commentedon May 21, 2023
I am also ordering an M1 Mac Mini, so I will have an an aarch64 system to play with soon.
ptrk8 commentedon May 27, 2023
No worries! Were you able to find this branch? :)
Exciting! Let me know if you need a hand with testing. I'm pretty keen to have this working on aarch64 mainly because I'd like to use your
libcpplibrary which uses thislibcimplementation by default. In the meantime, I might try buildinglibcppwith a differentlibcimplementation.Is the main outstanding item to ensure all the files in
arch/aarch64/srccontain validaarch64assembly code or is there more to getting it to work onaarch64?klokik commentedon Nov 5, 2023
Building with clang is fairly broken too
phillipjohnston commentedon Nov 6, 2023
I don't expect Clang to be any different really.
Good news is that I received an m2 machine last week, got it set up, and revived my old branch. Have a couple of last issues to get through but expecting to get initial aarch64 support out sometime this week.
phillipjohnston commentedon Nov 7, 2023
Master now has initial aarch64 support. I have built with XCode's clang, "real" clang, and GCC-13. I haven't tried cross-compilation yet, but I don't anticipate any problems given that it works with GCC on an arm64.
For now, crt0.S is not being built at all. For MacOS, it's not necessary. I'm unclear whether it's really needed on Linux or not - haven't set up a linux environment for testing yet. It would be needed for bare metal, but that would surprise me somewhat if that's what y'all were doing with the arm64 :)