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Loader: Implement mappable-region locating functions.

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This commit is contained in:
Michael Scire 2018-04-24 03:53:10 -06:00
parent 5e5dd530c7
commit 6afd59d2a2
2 changed files with 189 additions and 0 deletions
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180
stratosphere/loader/source/ldr_map.cpp Normal file
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#include <switch.h>
#include "ldr_map.hpp"
Result MapUtils::LocateSpaceForMap(u64 *out, u64 out_size) {
if (kernelAbove200()) {
return LocateSpaceForMapModern(out, out_size);
} else {
return LocateSpaceForMapDeprecated(out, out_size);
}
}
Result MapUtils::LocateSpaceForMapModern(u64 *out, u64 out_size) {
MemoryInfo mem_info = {0};
u32 page_info = 0;
u64 heap_base = 0, heap_size = 0, heap_end = 0;
u64 map_base = 0, map_size = 0, map_end = 0;
u64 addspace_base = 0, addspace_size = 0, addspace_end = 0;
u64 cur_base = 0, cur_end = 0;
Result rc;
if (R_FAILED((rc = svcGetInfo(&heap_base, 4, CUR_PROCESS_HANDLE, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&heap_size, 5, CUR_PROCESS_HANDLE, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&map_base, 2, CUR_PROCESS_HANDLE, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&map_size, 3, CUR_PROCESS_HANDLE, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&addspace_base, 12, CUR_PROCESS_HANDLE, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&addspace_size, 13, CUR_PROCESS_HANDLE, 0)))) {
return rc;
}
heap_end = heap_base + heap_size;
map_end = map_base + map_size;
addspace_end = addspace_base + addspace_size;
cur_base = addspace_base;
rc = 0xD001;
cur_end = cur_base + out_size;
if (cur_end <= cur_base) {
return rc;
}
if (heap_size) {
if (map_size) {
while (true) {
if (cur_end - 1 < heap_base || heap_end - 1 < cur_base) {
if (cur_end - 1 < map_base || map_end - 1 < cur_base) {
if (R_FAILED(svcQueryMemory(&mem_info, &page_info, cur_base))) {
/* TODO: panic. */
}
if (mem_info.type == 0 && mem_info.addr - cur_base + mem_info.size >= out_size) {
*out = cur_base;
return 0x0;
}
if (mem_info.addr + mem_info.size <= cur_base) {
return rc;
}
cur_base = mem_info.addr + mem_info.size;
if (cur_base >= addspace_end) {
return rc;
}
} else {
if (map_end == cur_base) {
return rc;
}
cur_base = map_end;
}
} else {
if (heap_end == cur_base) {
return rc;
}
cur_base = heap_end;
}
cur_end = cur_base + out_size;
if (cur_base + out_size <= cur_base) {
return rc;
}
}
} else {
while (true) {
if (cur_end - 1 < heap_base || heap_end - 1 < cur_base) {
if (R_FAILED(svcQueryMemory(&mem_info, &page_info, cur_base))) {
/* TODO: panic. */
}
if (mem_info.type == 0 && mem_info.addr - cur_base + mem_info.size >= out_size) {
*out = cur_base;
return 0x0;
}
if (mem_info.addr + mem_info.size <= cur_base) {
return rc;
}
cur_base = mem_info.addr + mem_info.size;
if (cur_base >= addspace_end) {
return rc;
}
} else {
if (heap_end == cur_base) {
return rc;
}
cur_base = heap_end;
}
cur_end = cur_base + out_size;
if (cur_base + out_size <= cur_base) {
return rc;
}
}
}
} else {
while (cur_end > cur_base) {
if (map_size && cur_end - 1 >= map_base && map_end - 1 >= cur_base) {
if (cur_base == map_end) {
return rc;
}
cur_base = map_end;
} else {
if (R_FAILED(svcQueryMemory(&mem_info, &page_info, cur_base))) {
/* TODO: panic. */
}
if (mem_info.type == 0 && mem_info.addr - cur_base + mem_info.size >= out_size) {
*out = cur_base;
return 0x0;
}
if (mem_info.addr + mem_info.size <= cur_base) {
return rc;
}
cur_base = mem_info.addr + mem_info.size;
if (cur_base >= addspace_end) {
return rc;
}
}
cur_end = cur_base + out_size;
}
}
return rc;
}
Result MapUtils::LocateSpaceForMapDeprecated(u64 *out, u64 out_size) {
MemoryInfo mem_info = {0};
u32 page_info = 0;
Result rc;
u64 cur_base = 0x8000000ULL;
if (R_FAILED((rc = svcQueryMemory(&mem_info, &page_info, cur_base)))) {
return rc;
}
rc = 0xD001;
while (true) {
if (mem_info.type == 0x10) {
return rc;
}
if (mem_info.type == 0 && mem_info.addr - cur_base + mem_info.size >= out_size) {
*out = cur_base;
return 0x0;
}
u64 mem_end = mem_info.addr + mem_info.size;
if (mem_end < cur_base) {
return rc;
}
if (mem_end >> 31) {
break;
}
cur_base = mem_end;
if (R_FAILED((rc = svcQueryMemory(&mem_info, &page_info, cur_base)))) {
return rc;
}
}
return rc;
}

9
stratosphere/loader/source/ldr_map.hpp Normal file
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#pragma once
#include <switch.h>
class MapUtils {
public:
static Result LocateSpaceForMapDeprecated(u64 *out, u64 out_size);
static Result LocateSpaceForMapModern(u64 *out, u64 out_size);
static Result LocateSpaceForMap(u64 *out, u64 out_size);
};