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61 lines
2.2 KiB
61 lines
2.2 KiB
#pragma once
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#include <stdint.h>
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#include <stdio.h>
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#ifndef PAGE_SIZE
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#define PAGE_SIZE (unsigned long)(1 << 12)
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#endif
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/* For this family of macros, do NOT pass zero as the pow2 */
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#define round_to_pow2(x, pow2) (((unsigned long)(x)) & (~((pow2)-1)))
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#define round_up_to_pow2(x, pow2) (round_to_pow2(((unsigned long)(x)) + (pow2)-1, (pow2)))
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#define round_to_page(x) round_to_pow2(x, PAGE_SIZE)
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#define round_up_to_page(x) round_up_to_pow2(x, PAGE_SIZE)
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#define EXPORT __attribute__((visibility("default")))
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#define IMPORT __attribute__((visibility("default")))
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#define INLINE __attribute__((always_inline))
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#define PAGE_ALIGNED __attribute__((aligned(PAGE_SIZE)))
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#define WEAK __attribute__((weak))
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/* FIXME: per-module configuration? Issue #101 */
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#define WASM_PAGE_SIZE (1024 * 64) /* 64KB */
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#define WASM_START_PAGES (1 << 8) /* 16MB */
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#define WASM_MAX_PAGES (1 << 15) /* 4GB */
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#define WASM_STACK_SIZE (1 << 19) /* 512KB */
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/* These are per module symbols and I'd need to dlsym for each module. instead just use global constants, see above
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macros. The code generator compiles in the starting number of wasm pages, and the maximum number of pages If we try
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and allocate more than max_pages, we should fault */
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/* The code generator also compiles in stubs that populate the linear memory and function table */
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void populate_memory(void);
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void populate_table(void);
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/* memory also provides the table access functions */
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#define INDIRECT_TABLE_SIZE (1 << 10)
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struct indirect_table_entry {
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uint32_t type_id;
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void * func_pointer;
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};
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/* Cache of Frequently Accessed Members used to avoid pointer chasing */
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struct sandbox_context_cache {
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struct indirect_table_entry *module_indirect_table;
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void * linear_memory_start;
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uint32_t linear_memory_size;
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};
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extern __thread struct sandbox_context_cache local_sandbox_context_cache;
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/* functions in the module to lookup and call per sandbox. */
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typedef int32_t (*mod_main_fn_t)(int32_t a, int32_t b);
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typedef void (*mod_glb_fn_t)(void);
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typedef void (*mod_mem_fn_t)(void);
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typedef void (*mod_tbl_fn_t)(void);
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typedef void (*mod_libc_fn_t)(int32_t, int32_t);
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