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[core] Support libnx homebrew NextLoad handoff

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Implement the homebrew NextLoad path used by libnx NROs to request another NRO from svcExitProcess.

Keep the existing process alive, rebuild the homebrew config and argv buffers, reset thread context, refresh process metadata, and add memory/address-space fallbacks needed for repeated in-place handoffs.

Reference: https://switchbrew.github.io/libnx/env_8h.html
This commit is contained in:
xbzk
2026-07-27 21:55:31 -03:00
parent 3469f3789f
commit 6bad422d08
10 changed files with 982 additions and 90 deletions
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src/common/address_space.inc
+19 -15
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@@ -336,22 +336,22 @@ ALLOC_MEMBER(VaType)::Allocate(VaType size) {
current_linear_alloc_end = alloc_start + size;
} else { // If linear allocation overflows the AS then find a gap
if (this->blocks.size() <= 2) {
ASSERT_MSG(false, "Unexpected allocator state!");
}
auto search_predecessor{std::next(this->blocks.begin())};
auto search_successor{std::next(search_predecessor)};
while (search_successor != this->blocks.end() &&
(search_successor->virt - search_predecessor->virt < size ||
search_predecessor->Mapped())) {
search_predecessor = search_successor++;
}
if (search_successor != this->blocks.end()) {
alloc_start = search_predecessor->virt;
alloc_start = virt_start;
} else {
return {}; // AS is full
auto search_predecessor{std::next(this->blocks.begin())};
auto search_successor{std::next(search_predecessor)};
while (search_successor != this->blocks.end() &&
(search_successor->virt - search_predecessor->virt < size ||
search_predecessor->Mapped())) {
search_predecessor = search_successor++;
}
if (search_successor != this->blocks.end()) {
alloc_start = search_predecessor->virt;
} else {
return {}; // AS is full
}
}
}
@@ -364,6 +364,10 @@ ALLOC_MEMBER(void)::AllocateFixed(VaType virt, VaType size) {
}
ALLOC_MEMBER(void)::Free(VaType virt, VaType size) {
const VaType virt_end = virt + size;
this->Unmap(virt, size);
if (virt_end >= virt && virt_end == current_linear_alloc_end) {
current_linear_alloc_end = virt < virt_start ? virt_start : virt;
}
}
} // namespace Common