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disable sbrk and emulate EVM linear memory internally (#76)

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Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
Signed-off-by: xermicus <cyrill@parity.io>
This commit is contained in:
Cyrill Leutwiler
2024-10-14 15:20:00 +02:00
committed by GitHub
parent 92a18460e4
commit f0f344a139
12 changed files with 115 additions and 122 deletions
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crates/runtime-api/src/polkavm_imports.c
+26 -13
View File
@@ -3,9 +3,34 @@
#include "polkavm_guest.h"
// Missing builtins
#define EVM_WORD_SIZE 32
#define ALIGN(size) ((size + EVM_WORD_SIZE - 1) & ~(EVM_WORD_SIZE - 1))
#define MAX_MEMORY_SIZE (64 * 1024)
static char __memory[MAX_MEMORY_SIZE];
static uint32_t __memory_size = 0;
void * __sbrk_internal(uint32_t offset, uint32_t size) {
if (offset >= MAX_MEMORY_SIZE || size > MAX_MEMORY_SIZE) {
return NULL;
}
uint32_t new_size = ALIGN(offset + size);
if (new_size > MAX_MEMORY_SIZE) {
return NULL;
}
if (new_size > __memory_size) {
__memory_size = new_size;
}
return (void *)&__memory[__memory_size];
}
uint32_t __msize() {
return __memory_size;
}
void * memset(void *b, int c, size_t len) {
uint8_t *dest = b;
while (len-- > 0) *dest++ = c;
@@ -37,18 +62,6 @@ void * memmove(void *dst, const void *src, size_t n) {
return dst;
}
void * __sbrk(uint32_t size) {
uint32_t address;
__asm__ __volatile__(
".insn r 0xb, 1, 0, %[dst], %[sz], zero"
: [dst] "=r" (address)
: [sz] "ir" (size)
:
);
return (void *)address;
}
// Imports
POLKAVM_IMPORT(void, input, uint32_t, uint32_t)