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Kernel: Add support for SA_SIGINFO

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This commit is contained in:
Bananymous
2025-11-13 04:19:06 +02:00
parent a44c45ff9e
commit dd636ffcb2
13 changed files with 260 additions and 96 deletions
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52
kernel/arch/i686/Signal.S
View File

@@ -2,15 +2,41 @@
// stack contains
// return address
// return stack
// return rflags
// siginfo_t
// signal number
// signal handler
.global signal_trampoline
signal_trampoline:
pusha
pushl %esi // gregs
pushl %edi
pushl %edx
pushl %ecx
pushl %ebx
pushl %eax
pushl %ebp
movl 40(%esp), %edi
movl 36(%esp), %eax
movl 76(%esp), %eax // return sp
addl $4, %eax // return address
movl 80(%esp), %ebx // return ip
pushl %eax;
pushl %ebx
// FIXME: populate these
xorl %eax, %eax
pushl %eax // stack
pushl %eax
pushl %eax
pushl %eax // sigset
pushl %eax
pushl %eax // link
movl %esp, %edx // ucontext
leal 68(%esp), %esi // siginfo
movl 64(%esp), %edi // signal number
movl 60(%esp), %eax // handlers
// align stack to 16 bytes
movl %esp, %ebp
@@ -19,7 +45,9 @@ signal_trampoline:
subl $512, %esp
fxsave (%esp)
subl $12, %esp
subl $4, %esp
pushl %edx
pushl %esi
pushl %edi
call *%eax
addl $16, %esp
@@ -29,9 +57,21 @@ signal_trampoline:
// restore stack
movl %ebp, %esp
popa
addl $32, %esp
addl $8, %esp
// restore registers
popl %ebp
popl %eax
popl %ebx
popl %ecx
popl %edx
popl %edi
popl %esi
// skip handler, number, siginfo_t
addl $44, %esp
// restore flags
popf
movl (%esp), %esp

91
kernel/arch/x86_64/Signal.S
View File

@@ -2,29 +2,48 @@
// stack contains
// return address
// return stack
// return rflags
// siginfo_t
// signal number
// signal handler
.global signal_trampoline
signal_trampoline:
pushq %rax
pushq %rbx
pushq %rcx
pushq %rdx
pushq %rbp
pushq %rdi
pushq %rsi
pushq %r8
pushq %r9
pushq %r10
pushq %r11
pushq %r12
pushq %r13
pushq %r15 // gregs
pushq %r14
pushq %r15
pushq %r13
pushq %r12
pushq %r11
pushq %r10
pushq %r9
pushq %r8
pushq %rsi
pushq %rdi
pushq %rdx
pushq %rcx
pushq %rbx
pushq %rax
pushq %rbp
movq 128(%rsp), %rdi
movq 120(%rsp), %rax
movq 200(%rsp), %rax // return sp
addq $(128 + 8), %rax // red-zone and return address
movq 208(%rsp), %rbx // return ip
pushq %rax;
pushq %rbx
// FIXME: populate these
xorq %rax, %rax
pushq %rax // stack
pushq %rax
pushq %rax
pushq %rax // sigset
pushq %rax // link
movq %rsp, %rdx // ucontext
leaq 192(%rsp), %rsi // siginfo
movq 184(%rsp), %rdi // signal number
movq 176(%rsp), %rax // handler
// align stack to 16 bytes
movq %rsp, %rbp
@@ -40,26 +59,32 @@ signal_trampoline:
// restore stack
movq %rbp, %rsp
popq %r15
popq %r14
popq %r13
popq %r12
popq %r11
popq %r10
popq %r9
popq %r8
popq %rsi
popq %rdi
popq %rbp
popq %rdx
popq %rcx
popq %rbx
popq %rax
addq $56, %rsp
addq $16, %rsp
// restore registers
popq %rbp
popq %rax
popq %rbx
popq %rcx
popq %rdx
popq %rdi
popq %rsi
popq %r8
popq %r9
popq %r10
popq %r11
popq %r12
popq %r13
popq %r14
popq %r15
// skip handler, number, siginfo_t
addq $72, %rsp
// restore flags
popfq
movq (%rsp), %rsp
// return over red-zone
// return over red-zone and siginfo_t
ret $128