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25 lines
764 B
C
25 lines
764 B
C
#include "malloc.h"
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#include "ecall.h"
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malloc_info global_malloc_info = { 0 };
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void* allocate_memory_end;
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void malloc_init(malloc_info* given_info)
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{
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global_malloc_info = *given_info;
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allocate_memory_end = given_info->allocate_memory_end;
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}
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// allocate stack and return a pointer to the *end* of the allocated region
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// this doesn't reuse stack from functions which exited
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optional_voidptr malloc_stack(size_t size)
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{
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void* new_alloc_end = (void*) (((int) allocate_memory_end) - size);
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if (new_alloc_end < global_malloc_info.allocate_memory_start)
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return (optional_voidptr) { .error = ENOMEM };
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void* stack_top = allocate_memory_end;
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allocate_memory_end = new_alloc_end;
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return (optional_voidptr) { .value = stack_top };
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}
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