50fcab2984
Implement the tls_value for s390 in the ELF general-dynamic mode. Notable differences to the x86_64 implementation are: - We use a __tls_get_offset libcall instead of __tls_get_addr. - The current thread pointer (stored in a pair of access registers) needs to be added to the result of __tls_get_offset. - __tls_get_offset has a variant ABI that requires the address of the GOT (global offset table) is passed in %r12. This means we need a new libcall entries for __tls_get_offset. In addition, we also need a way to access _GLOBAL_OFFSET_TABLE_. The latter is a "magic" symbol with a well-known name defined by the ABI and recognized by the linker. This patch introduces a new ExternalName::KnownSymbol variant to support such names (originally due to @afonso360). We also need to emit a relocation on a symbol placed in a constant pool, as well as an extra relocation on the call to __tls_get_offset required for TLS linker optimization. Needed by the cg_clif frontend.
27 lines
539 B
Plaintext
27 lines
539 B
Plaintext
test compile precise-output
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set tls_model=elf_gd
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target s390x
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function u0:0(i32) -> i64 {
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gv0 = symbol colocated tls u1:0
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block0(v0: i32):
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v1 = global_value.i64 gv0
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return v1
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}
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; stmg %r12, %r15, 96(%r15)
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; aghi %r15, -160
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; virtual_sp_offset_adjust 160
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; block0:
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; larl %r12, %ElfGlobalOffsetTable + 0
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; bras %r1, 12 ; data u1:0@tlsgd ; lg %r2, 0(%r1)
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; brasl %r14, %ElfTlsGetOffset:tls_gdcall:u1:0
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; ear %r3, %a0
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; sllg %r4, %r3, 32
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; ear %r4, %a1
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; agr %r2, %r4
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; lmg %r12, %r15, 256(%r15)
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; br %r14
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