91 lines
1.3 KiB
ArmAsm
91 lines
1.3 KiB
ArmAsm
.section .userspace, "ax"
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// stack contains
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// return address
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// return stack
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// return rflags
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// siginfo_t
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// signal number
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// signal handler
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.global signal_trampoline
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signal_trampoline:
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pushq %r15 // gregs
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pushq %r14
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pushq %r13
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pushq %r12
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pushq %r11
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pushq %r10
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pushq %r9
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pushq %r8
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pushq %rsi
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pushq %rdi
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pushq %rdx
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pushq %rcx
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pushq %rbx
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pushq %rax
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pushq %rbp
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movq 200(%rsp), %rax // return sp
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addq $(128 + 8), %rax // red-zone and return address
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movq 208(%rsp), %rbx // return ip
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pushq %rax;
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pushq %rbx
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// FIXME: populate these
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xorq %rax, %rax
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pushq %rax // stack
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pushq %rax
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pushq %rax
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pushq %rax // sigset
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pushq %rax // link
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movq %rsp, %rdx // ucontext
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leaq 192(%rsp), %rsi // siginfo
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movq 184(%rsp), %rdi // signal number
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movq 176(%rsp), %rax // handler
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// align stack to 16 bytes
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movq %rsp, %rbp
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andq $-16, %rsp
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subq $512, %rsp
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fxsave64 (%rsp)
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call *%rax
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fxrstor64 (%rsp)
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addq $512, %rsp
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// restore stack
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movq %rbp, %rsp
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addq $56, %rsp
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// restore registers
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popq %rbp
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popq %rax
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popq %rbx
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popq %rcx
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popq %rdx
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popq %rdi
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popq %rsi
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popq %r8
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popq %r9
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popq %r10
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popq %r11
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popq %r12
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popq %r13
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popq %r14
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popq %r15
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// skip handler, number, siginfo_t
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addq $72, %rsp
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// restore flags
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popfq
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movq (%rsp), %rsp
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// return over red-zone and siginfo_t
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ret $128
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