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48 lines
2.2 KiB
Plaintext
48 lines
2.2 KiB
Plaintext
/* hip_fatbin_tail.ld
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*
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* Move the merged .hip_fatbin output section to the very end of librccl.so.
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*
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* Why
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* ---
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* The bundled per-arch device image embedded in librccl.so (.hip_fatbin)
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* routinely grows to hundreds of megabytes and, with the full default
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* GPU_TARGETS list and uncompressed embedding, can exceed INT32_MAX.
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*
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* In lld's default orphan placement, .hip_fatbin (SHF_ALLOC, !SHF_WRITE,
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* !SHF_EXECINSTR) lands in the read-only loadable cluster, between .rodata
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* and .eh_frame. That puts a multi-hundred-MB blob between .text and the
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* subsequent data sections (.eh_frame, .data.rel.ro, .got, .data, .bss, ...)
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* and breaks small-code-model host relocations:
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* R_X86_64_PC32 / R_X86_64_PLT32 .text -> .rodata / .eh_frame / .data*
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* R_X86_64_GOTPCRELX .text -> .got slot on the far side
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* R_X86_64_32S literal offsets in .eh_frame / .data.rel.ro
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*
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* Nothing in .hip_fatbin is the target of a small-model relocation from
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* host code in the usual sense. The HIP runtime reaches it via the wrapper
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* struct in .hipFatBinSegment (which holds a 64-bit pointer materialized
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* via R_X86_64_RELATIVE / R_X86_64_64 in PIE/.so output). The constructor
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* __hip_module_ctor references &__hip_fatbin_wrapper, not &__hip_fatbin.
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*
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* So if .hip_fatbin lives at the tail of the image, the text<->data island
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* shrinks back to roughly its pre-fatbin size and small-code-model
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* relocations stay in range. The only long-distance reference is the
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* 64-bit pointer in the wrapper, which doesn't care about distance.
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*
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* How
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* ---
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* This file uses lld's (and ld.bfd's) INSERT AFTER directive: the default
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* linker script is preserved and we only splice .hip_fatbin in at a new
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* position. KEEP() prevents --gc-sections from dropping the blob (the
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* relocations from .hipFatBinSegment already keep it live, but be explicit).
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* ALIGN(0x1000) preserves the 4 KiB alignment the runtime expects.
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*
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* Applies to the host link of librccl.so for both ENABLE_DEVICE_LINKER=ON
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* (custom device-linker pipeline) and ENABLE_DEVICE_LINKER=OFF (-fgpu-rdc
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* --hip-link path). The offload device-link does not see this script.
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*/
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SECTIONS
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{
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.hip_fatbin : ALIGN(0x1000) { KEEP(*(.hip_fatbin)) }
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}
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INSERT AFTER .bss;
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