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web: introduce browser memory patching

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With 23.0.0 we have even less memory available which is causing the browser (openWeb) and eshop (systemWeb) applets to crash immediately.
While the amount of memory required by the browser applets didn't change this time, just implementing 23.0.0 changes was enough to push it over the limit.
Instead of reducing the memory available to us even further, this convoluted set of patches attempts to reclaim around 9 MB of unused browser memory.
This commit is contained in:
hexkyz
2026-09-27 01:35:29 +01:00
parent 2ae182bd5d
commit 59e7786a45
3 changed files with 80 additions and 1 deletions
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7
libraries/libmesosphere/source/board/nintendo/nx/kern_k_system_control.cpp
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@@ -357,7 +357,12 @@ namespace ams::kern::board::nintendo::nx {
/* Return (possibly) adjusted size. */
/* NOTE: On 20.0.0+ (and even more-so 21.0.0+) the browser requires much more memory in the applet pool in order to function. */
/* Thus, we have to reduce our extra system memory size by 26 MB to compensate. */
if (kern::GetTargetFirmware() >= ams::TargetFirmware_21_0_0) {
/* NOTE: On 23.0.0+ we are patching memory allocation for each browser applet since there are only 3 of them now. */
/* Given that the root "Reserved" region is 0x43E000 bytes and the "ReservedTbd" subregion is 0x540000 bytes, we can safely reclaim 9MB.*/
if (kern::GetTargetFirmware() >= ams::TargetFirmware_23_0_0) {
constexpr size_t ExtraSystemMemoryForAtmosphere_23_0_0 = 16_MB;
return base_pool_size - ExtraSystemMemoryForAtmosphere_23_0_0 - KTraceBufferSize;
} else if (kern::GetTargetFirmware() >= ams::TargetFirmware_21_0_0) {
constexpr size_t ExtraSystemMemoryForAtmosphere_21_0_0 = 7_MB;
return base_pool_size - ExtraSystemMemoryForAtmosphere_21_0_0 - KTraceBufferSize;
} else if (kern::GetTargetFirmware() >= ams::TargetFirmware_20_0_0) {

61
stratosphere/loader/source/ldr_embedded_web_patches.inc Normal file
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@@ -0,0 +1,61 @@
/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Breakdown of each patch in order: */
/* #1 - Patch the 0xDEEF000 size check branch to NOP. */
/* #2 - Change the root heap "Reserved" region allocation size from 0x43E000 to 0. */
/* #3 - Change the root heap "Scene" size from 0x4580000 to 0x4040000. */
/* #4 - Change the scene heap "ReservedTbd" region allocation size from 0x540000 to 0. */
/* #5 - Patch the linking of "ReservedTbd" to the parent heap with a NOP. */
/* #6 - Patch the initial memory block allocation size from 0xB400000 to 0xAC00000. */
/* #7 - Patch the initial memory block initialization size from 0xB400000 to 0xAC00000. */
constexpr inline const EmbeddedPatchEntry SystemWebMemoryPatches_23_0_0[] = {
{ 0x861DD4, "\x1F\x20\x03\xD5", 4 },
{ 0x861E80, "\x02\x00\x80\x52", 4 },
{ 0x861E6C, "\x82\x80\xA0\x52", 4 },
{ 0x8C1718, "\x02\x00\x80\x52", 4 },
{ 0x8C172C, "\x1F\x20\x03\xD5", 4 },
{ 0x861D44, "\x01\x58\xA1\x52", 4 },
{ 0x861D5C, "\x03\x58\xA1\x52", 4 },
};
constexpr inline const EmbeddedPatchEntry OpenWebMemoryPatches_23_0_0[] = {
{ 0x828DBC, "\x1F\x20\x03\xD5", 4 },
{ 0x828E68, "\x02\x00\x80\x52", 4 },
{ 0x828E54, "\x82\x80\xA0\x52", 4 },
{ 0x74C564, "\x02\x00\x80\x52", 4 },
{ 0x74C578, "\x1F\x20\x03\xD5", 4 },
{ 0x828D2C, "\x01\x58\xA1\x52", 4 },
{ 0x828D44, "\x03\x58\xA1\x52", 4 },
};
constexpr inline const EmbeddedPatchEntry OfflineWebMemoryPatches_23_0_0[] = {
{ 0x130698, "\x1F\x20\x03\xD5", 4 },
{ 0x130744, "\x02\x00\x80\x52", 4 },
{ 0x130730, "\x82\x80\xA0\x52", 4 },
{ 0x4D728, "\x02\x00\x80\x52", 4 },
{ 0x4D738, "\x1F\x20\x03\xD5", 4 },
{ 0x130614, "\x01\x58\xA1\x52", 4 },
{ 0x130624, "\x02\x58\xA1\x52", 4 },
};
constexpr inline const EmbeddedPatch WebMemoryPatches[] = {
{ ParseModuleId("97BF9C2D43EB002FB5B3578E7714F428104ED596"), util::size(SystemWebMemoryPatches_23_0_0), SystemWebMemoryPatches_23_0_0 }, /* 23.0.0 */
{ ParseModuleId("1470453424A9CDE689BE6DA86457ED1C79F5F403"), util::size(OpenWebMemoryPatches_23_0_0), OpenWebMemoryPatches_23_0_0 }, /* 23.0.0 */
{ ParseModuleId("86DAFFA68DA38660317018ADC7AD415BCCDDC583"), util::size(OfflineWebMemoryPatches_23_0_0), OfflineWebMemoryPatches_23_0_0 }, /* 23.0.0 */
};

13
stratosphere/loader/source/ldr_patcher.cpp
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@@ -109,6 +109,7 @@ namespace ams::ldr {
#include "ldr_embedded_usb_patches.inc"
#include "ldr_embedded_am_patches.inc"
#include "ldr_embedded_web_patches.inc"
}
@@ -153,6 +154,18 @@ namespace ams::ldr {
}
}
}
/* TODO: Remove this if/when a cleaner solution is figured out. */
for (const auto &patch : WebMemoryPatches) {
if (std::memcmp(std::addressof(patch.module_id), std::addressof(module_id), sizeof(module_id)) == 0) {
for (size_t i = 0; i < patch.num_entries; ++i) {
const auto &entry = patch.entries[i];
if (entry.offset + entry.size <= mapped_size) {
std::memcpy(reinterpret_cast<void *>(mapped_nso + entry.offset), entry.data, entry.size);
}
}
}
}
}
}