loongarch64-linux-musl #164
Comments
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musl upstream does not support this target yet https://wiki.musl-libc.org/supported-platforms |
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There is some patch in the mailing list and I guess the support is coming soon. https://inbox.vuxu.org/musl/2a8d55b0-add3-4d90-1119-4e5c28b6626e@loongson.cn/ Anyway, maybe trying to make #166 work first is a good idea. |
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musl support is coming: https://www.openwall.com/lists/musl/2024/01/25/12 |
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https://musl.libc.org/releases.html musl 1.2.5 adds loongarch64 support. |
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current status is: In other words, unable to build compiler_rt from source due to LLVM bug in lowering to fp16. |
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I'm trying to handle the code model issue for loongarch64 target. If the code model is not set properly, it will have R_LARCH_B26 overflow problem now. |
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I managed to bootstrap a loongarch64-linux-musl zig with some patch like this on zig: diff --git a/lib/libc/glibc/sysdeps/loongarch/start.S b/lib/libc/glibc/sysdeps/loongarch/start.S
index de7f9645cf..976dd92178 100644
--- a/lib/libc/glibc/sysdeps/loongarch/start.S
+++ b/lib/libc/glibc/sysdeps/loongarch/start.S
@@ -56,7 +56,7 @@ ENTRY (ENTRY_POINT)
/* Terminate call stack by noting ra is undefined. Use a dummy
.cfi_label to force starting the FDE. */
- .cfi_label .Ldummy
+ /* .cfi_label .Ldummy */
cfi_undefined (1)
or a5, a0, zero /* rtld_fini */
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 233cf7e3eb..80e37c1ad3 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -11799,6 +11799,7 @@ fn backendSupportsF16(target: std.Target) bool {
.mips64,
.mips64el,
.s390x,
+ .loongarch64,
=> false,
.aarch64,
.aarch64_be,
However, when trying to use this zig to build a simple hello world C file #include <stdio.h>
int main() {
printf("Hello, World!\n");
return 0;
}with I got the following error. But this doesn't happen on x86_64 zig. #0 0x000000000a435b18 in ZigLLVMTargetMachineEmitToFile (targ_machine_ref=0x7fffe7ec9f90,
module_ref=0x7fffe6ffff90, error_message=0x7fffeef32050,
options=<error reading variable: Cannot access memory at address 0x0>)
at /Users/yxd/playspace/zig/src/zig_llvm.cpp:218
#1 0x0000000009860f30 in codegen.llvm.Object.emit (self=<optimized out>, options=...)
at /Users/yxd/playspace/zig/src/codegen/llvm.zig:1317
#2 0x000000000985f210 in Compilation.emitLlvmObject (comp=0x7ffff7fe6c10, arena=...,
default_emit=..., bin_emit_loc=..., llvm_object=0x7fffedf0c1d0) at Compilation.zig:2756
#3 0x0000000009938304 in link.File.emitLlvmObject (arena=..., llvm_object=0x0,
prog_node=...) at link.zig:1032
#4 link.Elf.flushModule (self=0x7fffedf28e70, arena=..., tid=main, prog_node=...)
at /Users/yxd/playspace/zig/src/link/Elf.zig:992
#5 0x000000000985ccc8 in link.File.flushModule (base=0x7fffedf292d0, tid=main)
at link.zig:635
#6 link.File.linkAsArchive (base=0x7fffedf292d0, tid=main) at link.zig:762
#7 link.File.flush (base=<optimized out>, arena=..., tid=main, prog_node=...)
at link.zig:619
#8 0x000000000985b4cc in Compilation.flush (comp=0x7ffff7fe6c10, arena=..., tid=main,
prog_node=...) at Compilation.zig:2446
#9 0x000000000980acd8 in Compilation.update (comp=0x7ffff7fe6c10, main_progress_node=...)
at Compilation.zig:2396
#10 0x0000000009ffc598 in Compilation.updateSubCompilation (parent_comp=0x7fffeff43770,
sub_comp=0x7ffff7fe6c10, misc_task=compiler_rt) at Compilation.zig:6274
#11 0x000000000a009054 in Compilation.buildOutputFromZig (comp=0x7fffeff43770,
output_mode=<optimized out>, out=0x7fffeff43cf8, misc_task_tag=compiler_rt,
prog_node=...) at Compilation.zig:6413
#12 0x0000000009fceb84 in Compilation.buildRt (comp=0x7fffeff43770, misc_task=compiler_rt,
output_mode=Exe, out=0x0,
prog_node=<error reading variable: Cannot access memory at address 0x0>)
at Compilation.zig:4612
#13 0x0000000009fcea54 in Thread.WaitGroup.spawnManager__anon_193170.Manager.run (
wg_inner=0x7ffffffe66d8, args_inner=...)
at /Users/yxd/playspace/zig-bootstrap/out/host/lib/zig/std/Thread/WaitGroup.zig:62
#14 Thread.callFn__anon_390026 (args=...)
at /Users/yxd/playspace/zig-bootstrap/out/host/lib/zig/std/Thread.zig:409
#15 Thread.PosixThreadImpl.spawn__anon_319169.Instance.entryFn (raw_arg=0x7ffff7fbb800)
at /Users/yxd/playspace/zig-bootstrap/out/host/lib/zig/std/Thread.zig:678
#16 0x000000000a4d3050 in start (p=0x7fffeef378f0)
at /Users/yxd/playspace/zig-bootstrap/out/host/lib/zig/libc/musl/src/thread/pthread_create.c:207
#17 0x00000000095775b4 in __clone ()
at /Users/yxd/playspace/zig-bootstrap/out/host/lib/zig/libc/musl/src/thread/loongarch64/clone.s:27Looking into this. |
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Same as #166 (comment) |
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With LLVM 19.1.0rc4 I get this: |
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Managed to bootstrap loongarch64-linux-musl with this patch. However, I'm not familiar with llvm so I'm not sure whether this fix is reasonable. |
SixWeining
pushed a commit
to llvm/llvm-project
that referenced
this issue
Sep 13, 2024
…ongarch (#107791) For zig with LLVM 19.1.0rc4, we are seeing the following error when bootstrapping a `loongarch64-linux-musl` target. ziglang/zig-bootstrap#164 (comment) It seems that this issue is caused by `PromoteFloatResult` is not handling FREEZE OP on loongarch. Here is the reproduction of the error: https://godbolt.org/z/PPfvWjjG5 ~~This patch adds the FREEZE OP handling with `PromoteFloatRes_UnaryOp` and adds a test case.~~ This patch changes loongarch's way of floating point promotion to soft promotion to avoid this problem. See: loongarch's handling of `half`: - #93894 - #94456 Also see: other float promotion FREEZE handling - 0019c2f
llvmbot
pushed a commit
to llvmbot/llvm-project
that referenced
this issue
Sep 18, 2024
…ongarch (llvm#107791) For zig with LLVM 19.1.0rc4, we are seeing the following error when bootstrapping a `loongarch64-linux-musl` target. ziglang/zig-bootstrap#164 (comment) It seems that this issue is caused by `PromoteFloatResult` is not handling FREEZE OP on loongarch. Here is the reproduction of the error: https://godbolt.org/z/PPfvWjjG5 ~~This patch adds the FREEZE OP handling with `PromoteFloatRes_UnaryOp` and adds a test case.~~ This patch changes loongarch's way of floating point promotion to soft promotion to avoid this problem. See: loongarch's handling of `half`: - llvm#93894 - llvm#94456 Also see: other float promotion FREEZE handling - llvm@0019c2f (cherry picked from commit 13280d9)
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system:
OS: loongarchlinux
GCC:
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