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[libc] Implement sbrk to allow malloc() to work

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Userspace can now allocte via malloc. This is slightly janky because it
relies on a single static handle in the library code.
This commit is contained in:
Justin C. Miller
2020-09-27 17:31:23 -07:00
parent 2d44e8112b
commit ff78c951f0
4 changed files with 47 additions and 18 deletions
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22
src/drivers/nulldrv/main.cpp
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@@ -61,27 +61,17 @@ main(int argc, const char **argv)
_syscall_system_log("main thread starting");
uintptr_t base = 0xcc0000000;
j6_handle_t vma = j6_handle_invalid;
j6_status_t result = _syscall_vma_create_map(&vma, 0x100000, base, 1);
if (result != j6_status_ok)
return result;
size_t size = 0x800000;
result = _syscall_vma_resize(vma, &size);
if (result != j6_status_ok)
return result;
if (size == 0x800000)
_syscall_system_log("main thread resized memory area");
void *base = malloc(0x1000);
if (!base)
return 1;
uint64_t *vma_ptr = reinterpret_cast<uint64_t*>(base);
for (int i = 0; i < 300; ++i)
vma_ptr[i * 512] = uint64_t(i);
vma_ptr[i] = uint64_t(i);
_syscall_system_log("main thread wrote to memory area");
result = _syscall_endpoint_create(&endp);
j6_status_t result = _syscall_endpoint_create(&endp);
if (result != j6_status_ok)
return result;
@@ -94,7 +84,7 @@ main(int argc, const char **argv)
_syscall_system_log("main thread created sub thread");
char message[] = "MAIN THREAD SUCCESSFULLY CALLED SENDRECV IF THIS IS LOWERCASE";
size = sizeof(message);
size_t size = sizeof(message);
result = _syscall_endpoint_sendrecv(endp, &size, (void*)message);
if (result != j6_status_ok)
return result;