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xamarin-macios/runtime/trampolines-x86_64-asm.s

128 строки
3.0 KiB
ArmAsm
Исходник Обычный вид История

Build our runtime.
2016-04-21 15:19:32 +03:00
#
# store all parameters in a consistent way, and send it off to managed code.
# we need to store:
# %rdi, %rsi, %rdx, %rcx, %r8, %r9
# %xmm0-%xmm7
# an unknown amount of stack space, but we can pass a pointer to the start of this area.
[runtime] Fix crash in the x86_64 dynamic registrar. (#5989) In [this][1] innocuous-looking commit I made the x86_64 dynamic registrar crash when TRACE is defined. The underlying problem is that CallState's rsi field is re-used as rax upon exit of the trampoline. This means that the CallState.sel () function that gets the selector, will instead get the return value upon exit. When TRACE is defined, we try to print the selector upon exiting the trampoline, and since the rsi field is now the rax field, we end up trying to print the return value as if it were a selector, and things go slightly sideways. [1]: https://github.com/xamarin/xamarin-macios/commit/464882d14a83
2019-05-06 08:25:49 +03:00
# in total we need 7*64bits registers + 8*128bits registers + 1*64bit ptr = 192 bytes.
# additionally we'll use %r11 to specify the type of trampoline was called, so 200 bytes.
# and finally we need to align the long double fields on a 16-byte boundary, so 208 bytes.
Build our runtime.
2016-04-21 15:19:32 +03:00
#
#
# upon return we may need to write to:
# %rax, %rdx
# %xmm0-%xmm1
# (the spec says %st0 and %st1 are used to return 'long double' arguments, but we won't encounter those)
#
#if __x86_64__
[runtime] Make the existing trampolines exception-aware. This is required so that the Objective-C exception unwinder can properly unwind through these trampolines.
2016-05-11 13:06:37 +03:00
.subsections_via_symbols
.text
Build our runtime.
2016-04-21 15:19:32 +03:00
_xamarin_x86_64_common_trampoline:
[runtime] Make the existing trampolines exception-aware. This is required so that the Objective-C exception unwinder can properly unwind through these trampolines.
2016-05-11 13:06:37 +03:00
.cfi_startproc
Build our runtime.
2016-04-21 15:19:32 +03:00
pushq %rbp
[runtime] Make the existing trampolines exception-aware. This is required so that the Objective-C exception unwinder can properly unwind through these trampolines.
2016-05-11 13:06:37 +03:00
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
Build our runtime.
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movq %rsp, %rbp
[runtime] Make the existing trampolines exception-aware. This is required so that the Objective-C exception unwinder can properly unwind through these trampolines.
2016-05-11 13:06:37 +03:00
.cfi_def_cfa_register %rbp
[runtime] Fix crash in the x86_64 dynamic registrar. (#5989) In [this][1] innocuous-looking commit I made the x86_64 dynamic registrar crash when TRACE is defined. The underlying problem is that CallState's rsi field is re-used as rax upon exit of the trampoline. This means that the CallState.sel () function that gets the selector, will instead get the return value upon exit. When TRACE is defined, we try to print the selector upon exiting the trampoline, and since the rsi field is now the rax field, we end up trying to print the return value as if it were a selector, and things go slightly sideways. [1]: https://github.com/xamarin/xamarin-macios/commit/464882d14a83
2019-05-06 08:25:49 +03:00
subq $0xD0, %rsp # allocate 208 bytes from the stack
Build our runtime.
2016-04-21 15:19:32 +03:00
# todo: verify alignment.
movq %r11, (%rsp)
movq %rdi, 8(%rsp)
movq %rsi, 16(%rsp)
movq %rdx, 24(%rsp)
[runtime] Fix crash in the x86_64 dynamic registrar. (#5989) In [this][1] innocuous-looking commit I made the x86_64 dynamic registrar crash when TRACE is defined. The underlying problem is that CallState's rsi field is re-used as rax upon exit of the trampoline. This means that the CallState.sel () function that gets the selector, will instead get the return value upon exit. When TRACE is defined, we try to print the selector upon exiting the trampoline, and since the rsi field is now the rax field, we end up trying to print the return value as if it were a selector, and things go slightly sideways. [1]: https://github.com/xamarin/xamarin-macios/commit/464882d14a83
2019-05-06 08:25:49 +03:00
movq %rdx, 72(%rsp) # store a copy of rdx where we read the rdx return value from.
Build our runtime.
2016-04-21 15:19:32 +03:00
movq %rcx, 32(%rsp)
movq %r8, 40(%rsp)
movq %r9, 48(%rsp)
movq %rbp, 56(%rsp)
[runtime] Fix crash in the x86_64 dynamic registrar. (#5989) In [this][1] innocuous-looking commit I made the x86_64 dynamic registrar crash when TRACE is defined. The underlying problem is that CallState's rsi field is re-used as rax upon exit of the trampoline. This means that the CallState.sel () function that gets the selector, will instead get the return value upon exit. When TRACE is defined, we try to print the selector upon exiting the trampoline, and since the rsi field is now the rax field, we end up trying to print the return value as if it were a selector, and things go slightly sideways. [1]: https://github.com/xamarin/xamarin-macios/commit/464882d14a83
2019-05-06 08:25:49 +03:00
movaps %xmm0, 80(%rsp)
movaps %xmm1, 96(%rsp)
movaps %xmm2, 112(%rsp)
movaps %xmm3, 128(%rsp)
movaps %xmm4, 144(%rsp)
movaps %xmm5, 160(%rsp)
movaps %xmm6, 176(%rsp)
movaps %xmm7, 192(%rsp)
Build our runtime.
2016-04-21 15:19:32 +03:00
movq %rsp, %rdi
callq _xamarin_arch_trampoline
# get return value(s)
[runtime] Fix crash in the x86_64 dynamic registrar. (#5989) In [this][1] innocuous-looking commit I made the x86_64 dynamic registrar crash when TRACE is defined. The underlying problem is that CallState's rsi field is re-used as rax upon exit of the trampoline. This means that the CallState.sel () function that gets the selector, will instead get the return value upon exit. When TRACE is defined, we try to print the selector upon exiting the trampoline, and since the rsi field is now the rax field, we end up trying to print the return value as if it were a selector, and things go slightly sideways. [1]: https://github.com/xamarin/xamarin-macios/commit/464882d14a83
2019-05-06 08:25:49 +03:00
movq 64(%rsp), %rax
movq 72(%rsp), %rdx
movaps 80(%rsp), %xmm0
movaps 96(%rsp), %xmm1
Build our runtime.
2016-04-21 15:19:32 +03:00
[runtime] Fix crash in the x86_64 dynamic registrar. (#5989) In [this][1] innocuous-looking commit I made the x86_64 dynamic registrar crash when TRACE is defined. The underlying problem is that CallState's rsi field is re-used as rax upon exit of the trampoline. This means that the CallState.sel () function that gets the selector, will instead get the return value upon exit. When TRACE is defined, we try to print the selector upon exiting the trampoline, and since the rsi field is now the rax field, we end up trying to print the return value as if it were a selector, and things go slightly sideways. [1]: https://github.com/xamarin/xamarin-macios/commit/464882d14a83
2019-05-06 08:25:49 +03:00
addq $0xD0, %rsp # deallocate 208 bytes from the stack
Build our runtime.
2016-04-21 15:19:32 +03:00
popq %rbp
ret
[runtime] Make the existing trampolines exception-aware. This is required so that the Objective-C exception unwinder can properly unwind through these trampolines.
2016-05-11 13:06:37 +03:00
.cfi_endproc
Build our runtime.
2016-04-21 15:19:32 +03:00
#
# trampolines
#
.globl _xamarin_trampoline
_xamarin_trampoline:
movq $0x0, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_static_trampoline
_xamarin_static_trampoline:
movq $0x1, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_ctor_trampoline
_xamarin_ctor_trampoline:
movq $0x2, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_fpret_single_trampoline
_xamarin_fpret_single_trampoline:
movq $0x4, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_static_fpret_single_trampoline
_xamarin_static_fpret_single_trampoline:
movq $0x5, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_fpret_double_trampoline
_xamarin_fpret_double_trampoline:
movq $0x8, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_static_fpret_double_trampoline
_xamarin_static_fpret_double_trampoline:
movq $0x9, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_stret_trampoline
_xamarin_stret_trampoline:
movq $0x10, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_static_stret_trampoline
_xamarin_static_stret_trampoline:
movq $0x11, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_longret_trampoline
_xamarin_longret_trampoline:
movq $0x20, %r11
jmp _xamarin_x86_64_common_trampoline
.globl _xamarin_static_longret_trampoline
_xamarin_static_longret_trampoline:
movq $0x21, %r11
jmp _xamarin_x86_64_common_trampoline
# etc...
#endif