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27 lines
811 B
C
27 lines
811 B
C
/*
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* sys_alloc_aligned.c
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*
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* Provides `sys_alloc_aligned` for non-RISC-V host targets
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* (e.g. aarch64-unknown-linux-gnu, x86_64-unknown-linux-gnu).
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*
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* On RISC-V the real symbol is supplied by the zkVM bare-metal runtime.
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* On host targets, risc0_zkvm_platform may still reference this symbol via
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* its `sys_alloc_words` helper; this stub satisfies that reference using
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* POSIX `posix_memalign`.
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*/
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#ifndef __riscv
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#include <stddef.h>
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#include <stdlib.h>
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void *sys_alloc_aligned(size_t bytes, size_t align) {
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void *ptr = NULL;
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/* posix_memalign requires alignment >= sizeof(void*) and a power of 2. */
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size_t real_align = align < sizeof(void *) ? sizeof(void *) : align;
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if (posix_memalign(&ptr, real_align, bytes) != 0)
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return NULL;
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return ptr;
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}
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#endif /* !__riscv */
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