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ios_fs: patch the fat32 driver to improve readdir and stat performance (thanks: @GaryOderNichts)

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Maschell 2023-11-24 13:30:51 +01:00
parent 48e1540f7a
commit d4200d781a
2 changed files with 101 additions and 0 deletions
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51
source/ios_kernel/source/instant_patches.c
View File

@ -82,6 +82,57 @@ void instant_patches_setup(void) {
*(volatile u32 *) fsa_phys(0x1073994C) = 0xe3a07020; // mov r7, 0x20
*(volatile u32 *) fsa_phys(0x10739950) = 0xea000013; // b LAB_107399a8
// fat32 driver patches
{
// patch out fopen in stat
*(volatile u32 *) fsa_phys(0x1078c748) = 0xe3a00001; //mov r0, #1
// patch out fclose in stat
*(volatile u32 *) fsa_phys(0x1078c754) = 0xe3a00000; //mov r0, #0
// patch out diropen in stat
*(volatile u32 *) fsa_phys(0x1078c71c) = 0xe3a00001; //mov r0, #1
// patch out dirclose in stat
*(volatile u32 *) fsa_phys(0x1078c728) = 0xe3a00000; //mov r0, #0
// patch out fopen in readdir
*(volatile u32 *) fsa_phys(0x1078b50c) = 0xe3a00001; //mov r0, #1
// patch out fclose in readdir
*(volatile u32 *) fsa_phys(0x1078b518) = 0xe3a00000; //mov r0, #0
// patch out fopendir in readdir
*(volatile u32 *) fsa_phys(0x1078b62c) = 0xe3a00001; //mov r0, #1
// patch out fclosedir in readdir
*(volatile u32 *) fsa_phys(0x1078b638) = 0xe3a00001; //mov r0, #1
// Avoid opening the file for getting the "alloc_size" in stat and readdir
*(volatile u32 *) fsa_phys(0x1078d5b0) = 0xe3a00001; //mov r0, #1 // fopen
*(volatile u32 *) fsa_phys(0x1078d738) = 0xe3a00000; //mov r0, #0 // fclose
*(volatile u32 *) fsa_phys(0x1078d5c4) = 0xe3a00000; //mov r0, #0 // finfo
// patch alloc_size to be filesize
{
// nop some code we don't want
*(volatile u32 *) fsa_phys(0x1078d6e8) = 0xea000000; //mov r0, r0
*(volatile u32 *) fsa_phys(0x1078d6ec) = 0xea000000; //mov r0, r0
// set param_2->allocSize = param_3->size;
*(volatile u32 *) fsa_phys(0x1078d6f0) = 0xe5db3248; //ldrb r3,[r11,#0x248]
*(volatile u32 *) fsa_phys(0x1078d6f4) = 0xe5c93014; //strb r3,[r9,#0x14]
*(volatile u32 *) fsa_phys(0x1078d6f8) = 0xe5db3249; //ldrb r3,[r11,#0x249]
*(volatile u32 *) fsa_phys(0x1078d6fc) = 0xe5c93015; //strb r3,[r9,#0x15]
*(volatile u32 *) fsa_phys(0x1078d700) = 0xe5db324a; //ldrb r3,[r11,#0x24a]
*(volatile u32 *) fsa_phys(0x1078d704) = 0xe5c93016; //strb r3,[r9,#0x16]
*(volatile u32 *) fsa_phys(0x1078d708) = 0xe5db324b; //ldrb r3,[r11,#0x24b]
*(volatile u32 *) fsa_phys(0x1078d70c) = 0xe5c93017; //strb r3,[r9,#0x17]
// nop previous alloc_size assign
*(volatile u32 *) fsa_phys(0x1078d71c) = 0xea000000; //mov r0, r0
*(volatile u32 *) fsa_phys(0x1078d720) = 0xea000000; //mov r0, r0
*(volatile u32 *) fsa_phys(0x1078d724) = 0xea000000; //mov r0, r0
}
}
int (*_iosMapSharedUserExecution)(void *descr) = (void *) 0x08124F88;
// patch kernel dev node registration

50
source/ios_kernel/source/ios_fs_patches.c
View File

@ -53,4 +53,54 @@ void fs_run_patches(uint32_t ios_elf_start) {
// patch FSA raw access
section_write_word(ios_elf_start, 0x1070FAE8, 0x05812070);
section_write_word(ios_elf_start, 0x1070FAEC, 0xEAFFFFF9);
// fat32 driver patches
// patch out fopen in stat
section_write_word(ios_elf_start, 0x1078c748, 0xe3a00001); // mov r0, #1
// patch out fclose in stat
section_write_word(ios_elf_start, 0x1078c754, 0xe3a00000); // mov r0, #0
// patch out diropen in stat
section_write_word(ios_elf_start, 0x1078c71c, 0xe3a00001); // mov r0, #1
// patch out dirclose in stat
section_write_word(ios_elf_start, 0x1078c728, 0xe3a00000); // mov r0, #0
// patch out fopen in readdir
section_write_word(ios_elf_start, 0x1078b50c, 0xe3a00001); // mov r0, #1
// patch out fclose in readdir
section_write_word(ios_elf_start, 0x1078b518, 0xe3a00000); // mov r0, #0
// patch out fopendir in readdir
section_write_word(ios_elf_start, 0x1078b62c, 0xe3a00001); // mov r0, #1
// patch out fclosedir in readdir
section_write_word(ios_elf_start, 0x1078b638, 0xe3a00001); // mov r0, #1
// Avoid opening the file for getting the "alloc_size" in stat and readdir
section_write_word(ios_elf_start, 0x1078d5b0, 0xe3a00001); // mov r0, #1 // fopen
section_write_word(ios_elf_start, 0x1078d738, 0xe3a00000); // mov r0, #0 // fclose
section_write_word(ios_elf_start, 0x1078d5c4, 0xe3a00000); // mov r0, #0 // finfo
// patch alloc_size to be filesize
{
// nop some code we don't want
section_write_word(ios_elf_start, 0x1078d6e8, 0xea000000); // mov r0, r0
section_write_word(ios_elf_start, 0x1078d6ec, 0xea000000); // mov r0, r0
// set param_2->allocSize = param_3->size;
section_write_word(ios_elf_start, 0x1078d6f0, 0xe5db3248); // ldrb r3,[r11,#0x248]
section_write_word(ios_elf_start, 0x1078d6f4, 0xe5c93014); // strb r3,[r9,#0x14]
section_write_word(ios_elf_start, 0x1078d6f8, 0xe5db3249); // ldrb r3,[r11,#0x249]
section_write_word(ios_elf_start, 0x1078d6fc, 0xe5c93015); // strb r3,[r9,#0x15]
section_write_word(ios_elf_start, 0x1078d700, 0xe5db324a); // ldrb r3,[r11,#0x24a]
section_write_word(ios_elf_start, 0x1078d704, 0xe5c93016); // strb r3,[r9,#0x16]
section_write_word(ios_elf_start, 0x1078d708, 0xe5db324b); // ldrb r3,[r11,#0x24b]
section_write_word(ios_elf_start, 0x1078d70c, 0xe5c93017); // strb r3,[r9,#0x17]
// nop previous alloc_size assign
section_write_word(ios_elf_start, 0x1078d71c, 0xea000000); // mov r0, r0
section_write_word(ios_elf_start, 0x1078d720, 0xea000000); // mov r0, r0
section_write_word(ios_elf_start, 0x1078d724, 0xea000000); // mov r0, r0
}
}