On Sat, Aug 10, 2019 at 11:25 PM Yang Wu <wuyang...@gmail.com> wrote: > > $ go version > go version go1.12.7 darwin/amd64 > $ uname -a > Darwin WudeMacBook-Pro.local 18.6.0 Darwin Kernel Version 18.6.0: Thu Apr 25 > 23:16:27 PDT 2019;RELEASE_X86_64 x86_64 > > I read a asm code segment recently, it look like this: > > mov %fs:-8, %RCX // load G descriptor from TLS > cmp 16(%RCX), %RSP > jbe morestack > > How do I know mov %fs:-8, %RCX is load G descriptor from TLS ? > > When I learn about the runtime package, I find that MOVQ $0x123, g(BX) in > asm_amd64.s. It is disass like this, mov qword ptr gs:[0x30], 0x123 when I > using delve. I figure that they may be the same question. But I am not sure > about this
That disassembly from delve doesn't look right to me. When I disassemble that instruction in asm_amd64.s using objdump, using AT&T syntax, I see 451270: 64 48 c7 04 25 f8 ff movq $0x123,%fs:0xfffffffffffffff8 So that corresponds to the instructions you mention before, which are used in function prologues. Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcXgLsHfo8CcpNVui%3DuA2JvTU%2BTaCGPSL2daN3qcVzY_8g%40mail.gmail.com.
