mirror of
https://github.com/limine-bootloader/limine
synced 2024-12-04 14:11:58 +03:00
Enable lto and move naked assembly functions to own files
This commit is contained in:
mintsuki
parent
5379787967
commit
ba7ed52f6a
BIN
limine.bin
BIN
limine.bin
Binary file not shown.
10
src/Makefile
10
src/Makefile
@ -1,7 +1,7 @@
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CC = ../toolchain/bin/i386-elf-gcc
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LD = ../toolchain/bin/i386-elf-gcc
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CFLAGS = -Os -pipe -Wall -Wextra
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CFLAGS = -flto -Os -pipe -Wall -Wextra
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INTERNAL_CFLAGS = \
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-std=gnu99 \
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@ -15,7 +15,7 @@ INTERNAL_CFLAGS = \
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-I. \
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-Wno-address-of-packed-member
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LDFLAGS = -O2
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LDFLAGS = -flto -Os
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INTERNAL_LDFLAGS = \
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-nostdlib \
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@ -27,7 +27,8 @@ INTERNAL_LDFLAGS = \
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.PHONY: all clean
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C_FILES := $(shell find ./ -type f -name '*.c' | sort)
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OBJ := $(C_FILES:.c=.o)
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ASM_FILES := $(shell find ./ -type f -name '*.asm' | grep -v bootsect | sort)
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OBJ := $(C_FILES:.c=.o) $(ASM_FILES:.asm=.o)
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all: limine.bin
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@ -38,5 +39,8 @@ limine.bin: $(OBJ)
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%.o: %.c
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$(CC) $(CFLAGS) $(INTERNAL_CFLAGS) -c $< -o $@
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%.o: %.asm
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nasm $< -f elf32 -o $@
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clean:
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rm -f $(OBJ)
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121
src/lib/blib.c
121
src/lib/blib.c
@ -68,127 +68,6 @@ void *balloc_aligned(size_t count, size_t alignment) {
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return ret;
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}
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__attribute__((used)) static uint32_t int_08_ticks_counter;
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__attribute__((naked)) static void int_08_isr(void) {
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ASM_BASIC(
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".code16\n\t"
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"inc dword ptr cs:[int_08_ticks_counter]\n\t"
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"int 0x40\n\t" // call callback
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"iret\n\t"
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".code32\n\t"
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);
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}
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uint32_t *ivt = 0; // this variable is not static else gcc will optimise the
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// 0 ptr to a ud2
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__attribute__((used)) static void hook_int_08(void) {
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ivt[0x40] = ivt[0x08]; // int 0x40 is callback interrupt
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ivt[0x08] = (uint16_t)(size_t)int_08_isr;
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}
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__attribute__((used)) static void dehook_int_08(void) {
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ivt[0x08] = ivt[0x40];
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}
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// This is a dirty hack but we need to execute this full function in real mode
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__attribute__((naked))
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int pit_sleep_and_quit_on_keypress(uint32_t ticks) {
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ASM_BASIC(
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"call hook_int_08\n\t"
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// pit_ticks in edx
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"mov edx, dword ptr ss:[esp+4]\n\t"
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"lea ecx, int_08_ticks_counter\n\t"
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"mov dword ptr ds:[ecx], 0\n\t"
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// Save non-scratch GPRs
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"push ebx\n\t"
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"push esi\n\t"
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"push edi\n\t"
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"push ebp\n\t"
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// Jump to real mode
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FARJMP32("0x08", "1f")
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"1: .code16\n\t"
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"mov ax, 0x10\n\t"
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"mov ds, ax\n\t"
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"mov es, ax\n\t"
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"mov fs, ax\n\t"
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"mov gs, ax\n\t"
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"mov ss, ax\n\t"
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"mov eax, cr0\n\t"
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"and al, 0xfe\n\t"
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"mov cr0, eax\n\t"
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FARJMP16("0", "1f")
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"1:\n\t"
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"mov ax, 0\n\t"
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"mov ds, ax\n\t"
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"mov es, ax\n\t"
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"mov fs, ax\n\t"
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"mov gs, ax\n\t"
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"mov ss, ax\n\t"
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"sti\n\t"
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"10:\n\t"
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"cmp dword ptr ds:[ecx], edx\n\t"
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"je 30f\n\t" // out on timeout
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"push ecx\n\t"
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"push edx\n\t"
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"mov ah, 0x01\n\t"
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"xor al, al\n\t"
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"int 0x16\n\t"
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"pop edx\n\t"
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"pop ecx\n\t"
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"jz 10b\n\t" // loop
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// on keypress
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"xor ax, ax\n\t"
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"int 0x16\n\t"
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"mov eax, 1\n\t"
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"jmp 20f\n\t" // out
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"30:\n\t" // out on timeout
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"xor eax, eax\n\t"
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"20:\n\t"
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"cli\n\t"
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// Jump back to pmode
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"mov ebx, cr0\n\t"
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"or bl, 1\n\t"
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"mov cr0, ebx\n\t"
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FARJMP16("0x18", "1f")
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"1: .code32\n\t"
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"mov bx, 0x20\n\t"
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"mov ds, bx\n\t"
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"mov es, bx\n\t"
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"mov fs, bx\n\t"
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"mov gs, bx\n\t"
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"mov ss, bx\n\t"
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// Restore non-scratch GPRs
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"pop ebp\n\t"
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"pop edi\n\t"
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"pop esi\n\t"
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"pop ebx\n\t"
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// Exit
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"push eax\n\t"
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"call dehook_int_08\n\t"
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"pop eax\n\t"
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"ret\n\t"
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);
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}
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uint64_t strtoui(const char *s) {
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uint64_t n = 0;
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while (*s)
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75
src/lib/builtins.asm
Normal file
75
src/lib/builtins.asm
Normal file
@ -0,0 +1,75 @@
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section .text
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global memcpy
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memcpy:
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push esi
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push edi
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mov eax, dword [esp+12]
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mov edi, eax
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mov esi, dword [esp+16]
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mov ecx, dword [esp+20]
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rep movsb
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pop edi
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pop esi
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ret
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global memset
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memset:
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push edi
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mov edx, dword [esp+8]
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mov edi, edx
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mov eax, dword [esp+12]
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mov ecx, dword [esp+16]
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rep stosb
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mov eax, edx
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pop edi
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ret
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global memmove
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memmove:
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push esi
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push edi
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mov eax, dword [esp+12]
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mov edi, eax
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mov esi, dword [esp+16]
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mov ecx, dword [esp+20]
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cmp edi, esi
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ja .copy_backwards
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rep movsb
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jmp .done
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.copy_backwards:
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lea edi, [edi+ecx-1]
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lea esi, [esi+ecx-1]
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std
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rep movsb
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cld
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.done:
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pop edi
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pop esi
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ret
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global memcmp
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memcmp:
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push esi
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push edi
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mov edi, dword [esp+12]
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mov esi, dword [esp+16]
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mov ecx, dword [esp+20]
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repe cmpsb
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jecxz .equal
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mov al, byte [edi-1]
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sub al, byte [esi-1]
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movsx eax, al
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jmp .done
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.equal:
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mov eax, ecx
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.done:
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pop edi
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pop esi
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ret
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@ -17,90 +17,6 @@ int tolower(int c) {
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return c;
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}
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__attribute__((naked))
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void *memcpy(void *dest, const void *src, size_t n) {
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ASM_BASIC(
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"push esi\n\t"
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"push edi\n\t"
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"mov eax, dword ptr [esp+12]\n\t"
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"mov edi, eax\n\t"
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"mov esi, dword ptr [esp+16]\n\t"
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"mov ecx, dword ptr [esp+20]\n\t"
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"rep movsb\n\t"
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"pop edi\n\t"
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"pop esi\n\t"
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"ret\n\t"
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);
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}
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__attribute__((naked))
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void *memset(void *s, int c, size_t n) {
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ASM_BASIC(
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"push edi\n\t"
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"mov edx, dword ptr [esp+8]\n\t"
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"mov edi, edx\n\t"
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"mov eax, dword ptr [esp+12]\n\t"
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"mov ecx, dword ptr [esp+16]\n\t"
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"rep stosb\n\t"
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"mov eax, edx\n\t"
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"pop edi\n\t"
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"ret\n\t"
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);
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}
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__attribute__((naked))
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void *memmove(void *dest, const void *src, size_t n) {
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ASM_BASIC(
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"push esi\n\t"
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"push edi\n\t"
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"mov eax, dword ptr [esp+12]\n\t"
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"mov edi, eax\n\t"
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"mov esi, dword ptr [esp+16]\n\t"
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"mov ecx, dword ptr [esp+20]\n\t"
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"cmp edi, esi\n\t"
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"ja 1f\n\t"
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"rep movsb\n\t"
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"jmp 2f\n\t"
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"1:\n\t"
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"lea edi, [edi+ecx-1]\n\t"
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"lea esi, [esi+ecx-1]\n\t"
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"std\n\t"
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"rep movsb\n\t"
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"cld\n\t"
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"2:\n\t"
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"pop edi\n\t"
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"pop esi\n\t"
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"ret\n\t"
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);
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}
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__attribute__((naked))
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int memcmp(const void *s1, const void *s2, size_t n) {
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ASM_BASIC(
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"push esi\n\t"
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"push edi\n\t"
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"mov edi, dword ptr [esp+12]\n\t"
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"mov esi, dword ptr [esp+16]\n\t"
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"mov ecx, dword ptr [esp+20]\n\t"
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"repe cmpsb\n\t"
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"jecxz 1f\n\t"
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"mov al, byte ptr [edi-1]\n\t"
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"sub al, byte ptr [esi-1]\n\t"
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"movsx eax, al\n\t"
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"jmp 2f\n\t"
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"1:\n\t"
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"mov eax, ecx\n\t"
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"2:\n\t"
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"pop edi\n\t"
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"pop esi\n\t"
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"ret\n\t"
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);
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}
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char *strcpy(char *dest, const char *src) {
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size_t i;
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@ -93,22 +93,22 @@ struct mbr_entry {
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} __attribute__((packed));
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static int mbr_get_part(struct part *ret, int drive, int partition) {
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// Variables.
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// Check if actually valid mbr
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uint16_t hint;
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read(drive, &hint, 444, sizeof(uint16_t));
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if (hint && hint != 0x5a5a)
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return INVALID_TABLE;
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struct mbr_entry entry;
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const size_t entry_address = 0x1be + sizeof(struct mbr_entry) * partition;
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size_t entry_offset = 0x1be + sizeof(struct mbr_entry) * partition;
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// Read the entry of the MBR.
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int r;
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if ((r = read(drive, &entry, entry_address, sizeof(struct mbr_entry)))) {
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int r = read(drive, &entry, entry_offset, sizeof(struct mbr_entry));
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if (r)
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return r;
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}
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// Check if the partition exists, fail if it doesnt.
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if (entry.type == 0) {
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if (entry.type == 0)
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return NO_PARTITION;
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}
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// Assign the final fields and return.
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ret->first_sect = entry.first_sect;
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ret->sect_count = entry.sect_count;
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return 0;
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118
src/lib/real.asm
Normal file
118
src/lib/real.asm
Normal file
@ -0,0 +1,118 @@
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section .text
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global rm_int
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rm_int:
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; Self-modifying code: int $int_no
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mov al, byte [esp+4]
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mov byte [.int_no], al
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; Save out_regs
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mov eax, dword [esp+8]
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mov dword [.out_regs], eax
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; Save in_regs
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mov eax, dword [esp+12]
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mov dword [.in_regs], eax
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; Save GDT in case BIOS overwrites it
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sgdt [.gdt]
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; Save non-scratch GPRs
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push ebx
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push esi
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push edi
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push ebp
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; Jump to real mode
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jmp 0x08:.bits16
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.bits16:
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bits 16
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mov ax, 0x10
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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mov eax, cr0
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and al, 0xfe
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mov cr0, eax
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jmp 0x00:.cszero
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.cszero:
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xor ax, ax
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mov ss, ax
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; Load in_regs
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mov dword [ss:.esp], esp
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mov esp, dword [ss:.in_regs]
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pop gs
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pop fs
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pop es
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pop ds
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popfd
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pop ebp
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pop edi
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pop esi
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pop edx
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pop ecx
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pop ebx
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pop eax
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mov esp, dword [ss:.esp]
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sti
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; Indirect interrupt call
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db 0xcd
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.int_no:
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db 0
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cli
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; Load out_regs
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mov dword [ss:.esp], esp
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mov esp, dword [ss:.out_regs]
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lea esp, [esp + 10*4]
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push eax
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push ebx
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push ecx
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push edx
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push esi
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push edi
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push ebp
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pushfd
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push ds
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push es
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push fs
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push gs
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mov esp, dword [ss:.esp]
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; Restore GDT
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lgdt [ss:.gdt]
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; Jump back to pmode
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mov eax, cr0
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or al, 1
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mov cr0, eax
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jmp 0x18:.bits32
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.bits32:
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bits 32
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mov ax, 0x20
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
|
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|
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; Restore non-scratch GPRs
|
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pop ebp
|
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pop edi
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pop esi
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pop ebx
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; Exit
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ret
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align 16
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.esp: dd 0
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.out_regs: dd 0
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.in_regs: dd 0
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.gdt: dq 0
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124
src/lib/real.c
124
src/lib/real.c
@ -1,124 +0,0 @@
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#include <stdint.h>
|
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#include <lib/real.h>
|
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#include <lib/asm.h>
|
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|
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__attribute__((naked))
|
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void rm_int(uint8_t int_no, struct rm_regs *out_regs, struct rm_regs *in_regs) {
|
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ASM_BASIC(
|
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// Self-modifying code: int $int_no
|
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"mov al, byte ptr ss:[esp+4]\n\t"
|
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"mov byte ptr ds:[3f], al\n\t"
|
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|
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// Save out_regs
|
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"mov eax, dword ptr ss:[esp+8]\n\t"
|
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"mov dword ptr ds:[6f], eax\n\t"
|
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|
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// Save in_regs
|
||||
"mov eax, dword ptr ss:[esp+12]\n\t"
|
||||
"mov dword ptr ds:[7f], eax\n\t"
|
||||
|
||||
// Save GDT in case BIOS overwrites it
|
||||
"sgdt [8f]\n\t"
|
||||
|
||||
// Save non-scratch GPRs
|
||||
"push ebx\n\t"
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"push ebp\n\t"
|
||||
|
||||
// Jump to real mode
|
||||
FARJMP32("0x08", "1f")
|
||||
"1: .code16\n\t"
|
||||
"mov ax, 0x10\n\t"
|
||||
"mov ds, ax\n\t"
|
||||
"mov es, ax\n\t"
|
||||
"mov fs, ax\n\t"
|
||||
"mov gs, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
"mov eax, cr0\n\t"
|
||||
"and al, 0xfe\n\t"
|
||||
"mov cr0, eax\n\t"
|
||||
FARJMP16("0", "1f")
|
||||
"1:\n\t"
|
||||
"xor ax, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
|
||||
// Load in_regs
|
||||
"mov dword ptr ss:[5f], esp\n\t"
|
||||
"mov esp, dword ptr ss:[7f]\n\t"
|
||||
"pop gs\n\t"
|
||||
"pop fs\n\t"
|
||||
"pop es\n\t"
|
||||
"pop ds\n\t"
|
||||
"popfd\n\t"
|
||||
"pop ebp\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"pop edx\n\t"
|
||||
"pop ecx\n\t"
|
||||
"pop ebx\n\t"
|
||||
"pop eax\n\t"
|
||||
"mov esp, dword ptr ss:[5f]\n\t"
|
||||
|
||||
"sti\n\t"
|
||||
|
||||
// Indirect interrupt call
|
||||
".byte 0xcd\n\t"
|
||||
"3: .byte 0\n\t"
|
||||
|
||||
"cli\n\t"
|
||||
|
||||
// Load out_regs
|
||||
"mov dword ptr ss:[5f], esp\n\t"
|
||||
"mov esp, dword ptr ss:[6f]\n\t"
|
||||
"lea esp, [esp + 10*4]\n\t"
|
||||
"push eax\n\t"
|
||||
"push ebx\n\t"
|
||||
"push ecx\n\t"
|
||||
"push edx\n\t"
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"push ebp\n\t"
|
||||
"pushfd\n\t"
|
||||
"push ds\n\t"
|
||||
"push es\n\t"
|
||||
"push fs\n\t"
|
||||
"push gs\n\t"
|
||||
"mov esp, dword ptr ss:[5f]\n\t"
|
||||
|
||||
// Restore GDT
|
||||
"lgdt ss:[8f]\n\t"
|
||||
|
||||
// Jump back to pmode
|
||||
"mov eax, cr0\n\t"
|
||||
"or al, 1\n\t"
|
||||
"mov cr0, eax\n\t"
|
||||
FARJMP16("0x18", "1f")
|
||||
"1: .code32\n\t"
|
||||
"mov ax, 0x20\n\t"
|
||||
"mov ds, ax\n\t"
|
||||
"mov es, ax\n\t"
|
||||
"mov fs, ax\n\t"
|
||||
"mov gs, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
|
||||
// Restore non-scratch GPRs
|
||||
"pop ebp\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"pop ebx\n\t"
|
||||
|
||||
// Exit
|
||||
"ret\n\t"
|
||||
|
||||
// ESP
|
||||
"5: .long 0\n\t"
|
||||
// out_regs
|
||||
"6: .long 0\n\t"
|
||||
// in_regs
|
||||
"7: .long 0\n\t"
|
||||
// gdt
|
||||
"8: .long 0\n\t"
|
||||
" .long 0\n\t"
|
||||
);
|
||||
}
|
||||
105
src/lib/sleep.asm
Normal file
105
src/lib/sleep.asm
Normal file
@ -0,0 +1,105 @@
|
||||
section .text
|
||||
|
||||
int_08_ticks_counter: dd 0
|
||||
|
||||
int_08_isr:
|
||||
bits 16
|
||||
inc dword [cs:int_08_ticks_counter]
|
||||
int 0x80 ; call callback
|
||||
iret
|
||||
bits 32
|
||||
|
||||
global pit_sleep_and_quit_on_keypress
|
||||
pit_sleep_and_quit_on_keypress:
|
||||
; Hook int 0x08
|
||||
mov edx, dword [0x08*4]
|
||||
mov dword [0x80*4], edx
|
||||
mov edx, int_08_isr
|
||||
mov dword [0x08*4], int_08_isr
|
||||
|
||||
; pit_ticks in edx
|
||||
mov edx, dword [esp+4]
|
||||
|
||||
mov dword [int_08_ticks_counter], 0
|
||||
|
||||
; Save non-scratch GPRs
|
||||
push ebx
|
||||
push esi
|
||||
push edi
|
||||
push ebp
|
||||
|
||||
; Jump to real mode
|
||||
jmp 0x08:.bits16
|
||||
.bits16:
|
||||
bits 16
|
||||
mov ax, 0x10
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov fs, ax
|
||||
mov gs, ax
|
||||
mov ss, ax
|
||||
mov eax, cr0
|
||||
and al, 0xfe
|
||||
mov cr0, eax
|
||||
jmp 0x00:.cszero
|
||||
.cszero:
|
||||
xor ax, ax
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov fs, ax
|
||||
mov gs, ax
|
||||
mov ss, ax
|
||||
|
||||
sti
|
||||
|
||||
.loop:
|
||||
cmp dword [int_08_ticks_counter], edx
|
||||
je .timeout
|
||||
|
||||
push ecx
|
||||
push edx
|
||||
mov ah, 0x01
|
||||
xor al, al
|
||||
int 0x16
|
||||
pop edx
|
||||
pop ecx
|
||||
|
||||
jz .loop
|
||||
|
||||
; on keypress
|
||||
xor ax, ax
|
||||
int 0x16
|
||||
mov eax, 1
|
||||
jmp .done
|
||||
|
||||
.timeout:
|
||||
xor eax, eax
|
||||
|
||||
.done:
|
||||
cli
|
||||
|
||||
; Jump back to pmode
|
||||
mov ebx, cr0
|
||||
or bl, 1
|
||||
mov cr0, ebx
|
||||
jmp 0x18:.bits32
|
||||
.bits32:
|
||||
bits 32
|
||||
mov bx, 0x20
|
||||
mov ds, bx
|
||||
mov es, bx
|
||||
mov fs, bx
|
||||
mov gs, bx
|
||||
mov ss, bx
|
||||
|
||||
; Restore non-scratch GPRs
|
||||
pop ebp
|
||||
pop edi
|
||||
pop esi
|
||||
pop ebx
|
||||
|
||||
; Dehook int 0x08
|
||||
mov edx, dword [0x80*4]
|
||||
mov dword [0x08*4], edx
|
||||
|
||||
ret
|
||||
Loading…
Reference in New Issue
Block a user