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Kernel: Use local labels in assembly

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Bananymous
2026-08-22 11:57:19 +03:00
parent 2f25bfb2db
commit 82fd57af9e
7 changed files with 57 additions and 62 deletions
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kernel/arch/i686/Syscall.S
+2 -2
View File
@@ -63,7 +63,7 @@ sys_fork_trampoline:
call read_ip
testl %eax, %eax
jz .done
jz .Lsys_fork_trampoline_done
movl %esp, %ebx
@@ -73,7 +73,7 @@ sys_fork_trampoline:
call sys_fork
addl $16, %esp
.done:
.Lsys_fork_trampoline_done:
popl %edi
popl %esi
popl %ebx
kernel/arch/i686/User.S
+6 -7
View File
@@ -28,27 +28,26 @@ safe_user_strncpy:
testl %ecx, %ecx
jz safe_user_strncpy_fault
.safe_user_strncpy_loop:
.Lsafe_user_strncpy_loop:
movb (%esi), %al
movb %al, (%edi)
testb %al, %al
jz .safe_user_strncpy_done
jz .Lsafe_user_strncpy_done
incl %edi
incl %esi
decl %ecx
jnz .safe_user_strncpy_loop
jnz .Lsafe_user_strncpy_loop
safe_user_strncpy_fault:
xorl %eax, %eax
jmp .safe_user_strncpy_return
jmp .Lsafe_user_strncpy_return
.safe_user_strncpy_done:
.Lsafe_user_strncpy_done:
movl $1, %eax
.safe_user_strncpy_return:
.Lsafe_user_strncpy_return:
movl 4(%esp), %edi
movl 8(%esp), %esi
ret
safe_user_strncpy_end:
kernel/arch/i686/boot.S
+15 -17
View File
@@ -168,14 +168,12 @@ has_sse:
check_requirements:
call has_cpuid
jz .exit
jz system_halt
call has_pae
jz .exit
jz system_halt
call has_sse
jz .exit
jz system_halt
ret
.exit:
jmp system_halt
enable_sse:
movl %cr0, %eax
@@ -225,8 +223,8 @@ _start:
# load boot GDT
lgdt V2P(boot_gdtr)
ljmpl $0x08, $V2P(gdt_flush)
gdt_flush:
ljmpl $0x08, $V2P(.Lgdt_flush)
.Lgdt_flush:
# set correct segment registers
movw $0x10, %ax
movw %ax, %ds
@@ -243,10 +241,10 @@ gdt_flush:
movl $g_boot_stack_top, %esp
# jump to higher half
leal higher_half, %ecx
leal .Lhigher_half, %ecx
jmp *%ecx
higher_half:
.Lhigher_half:
# call global constuctors
call _init
@@ -298,18 +296,18 @@ ap_ready:
.skip 4
1: cli; cld
ljmpl $0x00, $AP_REL(ap_cs_clear)
ljmpl $0x00, $AP_REL(.Lap_cs_clear)
ap_cs_clear:
.Lap_cs_clear:
# load ap gdt and enter protected mode
lgdt AP_REL(ap_gdtr)
movl %cr0, %eax
orb $1, %al
movl %eax, %cr0
ljmpl $0x08, $AP_REL(ap_protected_mode)
ljmpl $0x08, $AP_REL(.Lap_protected_mode)
.code32
ap_protected_mode:
.Lap_protected_mode:
movw $0x10, %ax
movw %ax, %ds
movw %ax, %ss
@@ -323,13 +321,13 @@ ap_protected_mode:
# load boot gdt and enter long mode
lgdt V2P(boot_gdtr)
ljmpl $0x08, $AP_REL(ap_flush_gdt)
ljmpl $0x08, $AP_REL(.Lap_flush_gdt)
ap_flush_gdt:
movl $ap_higher_half, %ecx
.Lap_flush_gdt:
movl $.Lap_higher_half, %ecx
jmp *%ecx
ap_higher_half:
.Lap_higher_half:
movl AP_REL(ap_prepare_paging), %eax
call *%eax
kernel/arch/x86_64/Syscall.S
+2 -2
View File
@@ -33,13 +33,13 @@ sys_fork_trampoline:
call read_ip
testq %rax, %rax
jz .done
jz .Lsys_fork_trampoline_done
movq %rax, %rsi
movq %rsp, %rdi
call sys_fork
.done:
.Lsys_fork_trampoline_done:
popq %r15
popq %r14
popq %r13
kernel/arch/x86_64/User.S
+14 -14
View File
@@ -20,28 +20,28 @@ safe_user_strncpy:
testq %rcx, %rcx
jz safe_user_strncpy_fault
.safe_user_strncpy_align_loop:
.Lsafe_user_strncpy_align_loop:
testb $0x7, %sil
jz .safe_user_strncpy_align_done
jz .Lsafe_user_strncpy_align_done
movb (%rsi), %al
movb %al, (%rdi)
testb %al, %al
jz .safe_user_strncpy_done
jz .Lsafe_user_strncpy_done
incq %rdi
incq %rsi
decq %rcx
jnz .safe_user_strncpy_align_loop
jnz .Lsafe_user_strncpy_align_loop
jmp safe_user_strncpy_fault
.safe_user_strncpy_align_done:
.Lsafe_user_strncpy_align_done:
movq $0x0101010101010101, %r8
movq $0x8080808080808080, %r9
.safe_user_strncpy_qword_loop:
.Lsafe_user_strncpy_qword_loop:
cmpq $8, %rcx
jb .safe_user_strncpy_qword_done
jb .Lsafe_user_strncpy_qword_done
movq (%rsi), %rax
movq %rax, %r10
@@ -52,36 +52,36 @@ safe_user_strncpy:
notq %r11
andq %r11, %r10
andq %r9, %r10
jnz .safe_user_strncpy_byte_loop
jnz .Lsafe_user_strncpy_byte_loop
movq %rax, (%rdi)
addq $8, %rdi
addq $8, %rsi
subq $8, %rcx
jnz .safe_user_strncpy_qword_loop
jnz .Lsafe_user_strncpy_qword_loop
jmp safe_user_strncpy_fault
.safe_user_strncpy_qword_done:
.Lsafe_user_strncpy_qword_done:
testq %rcx, %rcx
jz safe_user_strncpy_fault
.safe_user_strncpy_byte_loop:
.Lsafe_user_strncpy_byte_loop:
movb (%rsi), %al
movb %al, (%rdi)
testb %al, %al
jz .safe_user_strncpy_done
jz .Lsafe_user_strncpy_done
incq %rdi
incq %rsi
decq %rcx
jnz .safe_user_strncpy_byte_loop
jnz .Lsafe_user_strncpy_byte_loop
safe_user_strncpy_fault:
xorq %rax, %rax
ret
.safe_user_strncpy_done:
.Lsafe_user_strncpy_done:
movb $1, %al
ret
safe_user_strncpy_end:
kernel/arch/x86_64/boot.S
+14 -16
View File
@@ -161,12 +161,10 @@ is_64_bit:
check_requirements:
call has_cpuid
jz .exit
jz system_halt
call is_64_bit
jz .exit
jz system_halt
ret
.exit:
jmp system_halt
enable_sse:
movl %cr0, %eax
@@ -226,10 +224,10 @@ _start:
# flush gdt and jump to 64 bit
lgdt V2P(boot_gdtr)
ljmpl $0x08, $V2P(long_mode)
ljmpl $0x08, $V2P(.Llong_mode)
.code64
long_mode:
.Llong_mode:
movw $0x10, %ax
movw %ax, %ds
movw %ax, %ss
@@ -240,10 +238,10 @@ long_mode:
addq $KERNEL_OFFSET, %rsp
# jump to higher half
movabsq $higher_half, %rcx
movabsq $.Lhigher_half, %rcx
jmp *%rcx
higher_half:
.Lhigher_half:
# call global constuctors
call _init
@@ -293,18 +291,18 @@ ap_ready:
.skip 8
1: cli; cld
ljmpl $0x00, $AP_REL(ap_cs_clear)
ljmpl $0x00, $AP_REL(.Lap_cs_clear)
ap_cs_clear:
.Lap_cs_clear:
# load ap gdt and enter protected mode
lgdt AP_REL(ap_gdtr)
movl %cr0, %eax
orb $1, %al
movl %eax, %cr0
ljmpl $0x08, $AP_REL(ap_protected_mode)
ljmpl $0x08, $AP_REL(.Lap_protected_mode)
.code32
ap_protected_mode:
.Lap_protected_mode:
movw $0x10, %ax
movw %ax, %ds
movw %ax, %ss
@@ -318,14 +316,14 @@ ap_protected_mode:
# load boot gdt and enter long mode
lgdt V2P(boot_gdtr)
ljmpl $0x08, $AP_REL(ap_long_mode)
ljmpl $0x08, $AP_REL(.Lap_long_mode)
.code64
ap_long_mode:
movq $ap_higher_half, %rax
.Lap_long_mode:
movq $.Lap_higher_half, %rax
jmp *%rax
ap_higher_half:
.Lap_higher_half:
movq AP_REL(ap_prepare_paging), %rax
call *%rax
kernel/klibc/arch/i686/string.S
+4 -4
View File
@@ -19,20 +19,20 @@ memmove:
movl 12(%esp), %ecx
movl %edi, %edx
cmpl %edi, %esi
jb .memmove_slow
jb .Lmemmove_slow
rep movsb
.memmove_done:
.Lmemmove_done:
movl 4(%esp), %edi
movl 8(%esp), %esi
movl %edx, %eax
ret
.memmove_slow:
.Lmemmove_slow:
leal -1(%edi, %ecx), %edi
leal -1(%esi, %ecx), %esi
std
rep movsb
cld
jmp .memmove_done
jmp .Lmemmove_done
.align 16
.global memset