182b72aa48
Previously relocations were only generated for PIC output, but relocations for TLS GOT entries are always needed when shared memory is enabled, not just in PIC mode. This means that the `__wasm_apply_global_tls_relocs` is now generated even for statically linked (non-PIC) output. Without this the globals that hold the addresses of TLS symbols are not set correctly. Differential Revision: https://reviews.llvm.org/D112833
203 lines
5.2 KiB
ArmAsm
203 lines
5.2 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.o %s
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.globaltype __tls_base, i32
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.globaltype __tls_align, i32, immutable
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.globl tls1_addr
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tls1_addr:
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.functype tls1_addr () -> (i32)
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global.get __tls_base
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i32.const tls1@TLSREL
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i32.add
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end_function
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.globl tls2_addr
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tls2_addr:
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.functype tls2_addr () -> (i32)
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global.get __tls_base
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i32.const tls2@TLSREL
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i32.add
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end_function
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.globl tls3_addr
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tls3_addr:
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.functype tls3_addr () -> (i32)
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global.get __tls_base
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i32.const tls3
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i32.add
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end_function
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.globl tls_align
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tls_align:
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.functype tls_align () -> (i32)
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global.get __tls_align
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end_function
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# TLS symbols can also be accessed by `global.get tls1@GOT@TLS`
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# which is the pattern emitted for non-DSO-local symbols.
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# In this case the global that holds that address must be
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# initialized by `__wasm_apply_global_tls_relocs` which is
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# called by `__wasm_init_tls`.
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.globl tls1_got_addr
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tls1_got_addr:
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.functype tls1_got_addr () -> (i32)
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global.get tls1@GOT@TLS
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end_function
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.section .bss.no_tls,"",@
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.globl no_tls
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.p2align 2
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no_tls:
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.int32 0
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.size no_tls, 4
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// Older versions of LLVM did not use the "T" flag so we need to support
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// infering TLS from the name alone.
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.section .tdata.tls1,"",@
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.globl tls1
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.p2align 2
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tls1:
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.int32 1
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.size tls1, 4
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.section sec_tls2,"T",@
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.globl tls2
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.p2align 2
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tls2:
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.int32 1
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.size tls2, 4
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.section sec_tls3,"T",@
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.globl tls3
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.p2align 2
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tls3:
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.int32 0
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.size tls3, 4
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.section .custom_section.target_features,"",@
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.int8 2
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.int8 43
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.int8 7
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.ascii "atomics"
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.int8 43
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.int8 11
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.ascii "bulk-memory"
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# RUN: wasm-ld -no-gc-sections --shared-memory --max-memory=131072 --no-entry -o %t.wasm %t.o
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# RUN: obj2yaml %t.wasm | FileCheck %s
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# RUN: llvm-objdump -d --no-show-raw-insn --no-leading-addr %t.wasm | FileCheck --check-prefix=ASM %s --
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# RUN: wasm-ld -no-gc-sections --shared-memory --max-memory=131072 --no-merge-data-segments --no-entry -o %t2.wasm %t.o
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# RUN: obj2yaml %t2.wasm | FileCheck %s
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# CHECK: - Type: GLOBAL
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# __stack_pointer
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# CHECK-NEXT: Globals:
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# CHECK-NEXT: - Index: 0
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# CHECK-NEXT: Type: I32
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# CHECK-NEXT: Mutable: true
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# CHECK-NEXT: InitExpr:
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# CHECK-NEXT: Opcode: I32_CONST
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# CHECK-NEXT: Value: 66592
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# __tls_base
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# CHECK-NEXT: - Index: 1
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# CHECK-NEXT: Type: I32
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# CHECK-NEXT: Mutable: true
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# CHECK-NEXT: InitExpr:
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# CHECK-NEXT: Opcode: I32_CONST
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# CHECK-NEXT: Value: 0
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# __tls_size
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# CHECK-NEXT: - Index: 2
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# CHECK-NEXT: Type: I32
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# CHECK-NEXT: Mutable: false
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# CHECK-NEXT: InitExpr:
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# CHECK-NEXT: Opcode: I32_CONST
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# CHECK-NEXT: Value: 12
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# __tls_align
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# CHECK-NEXT: - Index: 3
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# CHECK-NEXT: Type: I32
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# CHECK-NEXT: Mutable: false
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# CHECK-NEXT: InitExpr:
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# CHECK-NEXT: Opcode: I32_CONST
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# CHECK-NEXT: Value: 4
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# ASM-LABEL: <__wasm_init_tls>:
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# ASM-EMPTY:
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# ASM-NEXT: local.get 0
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# ASM-NEXT: global.set 1
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# ASM-NEXT: local.get 0
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# ASM-NEXT: i32.const 0
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# ASM-NEXT: i32.const 12
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# ASM-NEXT: memory.init 0, 0
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# call to __wasm_apply_global_tls_relocs>
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# ASM-NEXT: call 3
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# ASM-NEXT: end
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# ASM-LABEL: <__wasm_apply_global_tls_relocs>:
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# ASM-EMPTY:
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# ASM-NEXT: global.get 1
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# ASM-NEXT: i32.const 0
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# ASM-NEXT: i32.add
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# ASM-NEXT: global.set 4
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# ASM-NEXT: end
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# ASM-LABEL: <tls1_addr>:
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# ASM-EMPTY:
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# ASM-NEXT: global.get 1
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# ASM-NEXT: i32.const 0
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# ASM-NEXT: i32.add
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# ASM-NEXT: end
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# ASM-LABEL: <tls2_addr>:
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# ASM-EMPTY:
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# ASM-NEXT: global.get 1
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# ASM-NEXT: i32.const 4
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# ASM-NEXT: i32.add
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# ASM-NEXT: end
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# ASM-LABEL: <tls3_addr>:
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# ASM-EMPTY:
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# ASM-NEXT: global.get 1
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# ASM-NEXT: i32.const 8
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# ASM-NEXT: i32.add
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# ASM-NEXT: end
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# ASM-LABEL: <tls_align>:
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# ASM-EMPTY:
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# ASM-NEXT: global.get 3
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# ASM-NEXT: end
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# Also verify TLS usage with --relocatable
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# RUN: wasm-ld --relocatable -o %t3.wasm %t.o
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# RUN: obj2yaml %t3.wasm | FileCheck %s --check-prefix=RELOC
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# RELOC: - Type: IMPORT
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# RELOC-NEXT: Imports:
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# RELOC-NEXT: - Module: env
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# RELOC-NEXT: Field: __tls_base
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# RELOC-NEXT: Kind: GLOBAL
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# RELOC-NEXT: GlobalType: I32
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# RELOC-NEXT: GlobalMutable: true
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# RELOC-NEXT: - Module: env
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# RELOC-NEXT: Field: __tls_align
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# RELOC-NEXT: Kind: GLOBAL
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# RELOC-NEXT: GlobalType: I32
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# RELOC-NEXT: GlobalMutable: false
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# RELOC: GlobalNames:
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# RELOC-NEXT: - Index: 0
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# RELOC-NEXT: Name: __tls_base
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# RELOC-NEXT: - Index: 1
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# RELOC-NEXT: Name: __tls_align
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# RELOC-NEXT: - Index: 2
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# RELOC-NEXT: Name: GOT.data.internal.tls1
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# RELOC-NEXT: DataSegmentNames:
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# RELOC-NEXT: - Index: 0
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# RELOC-NEXT: Name: .tdata
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# RELOC-NEXT: - Index: 1
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# RELOC-NEXT: Name: .bss.no_tls
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