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| author | Austin Clements <austin@google.com> | 2021-03-29 17:38:20 -0400 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2021-04-01 00:51:26 +0000 |
| commit | ec721d92bf35cd47543acf6792acd474fdd39446 (patch) | |
| tree | 9a8c2a9df49cdfb2b9b6e0364c086ebfdfa0e962 /src/runtime/sys_netbsd_arm64.s | |
| parent | 1f29e69bad3673aa4f9d1c4d1016170b9ced634a (diff) | |
| download | go-ec721d92bf35cd47543acf6792acd474fdd39446.tar.gz go-ec721d92bf35cd47543acf6792acd474fdd39446.zip | |
runtime: fix uses of ABIInternal PCs in assembly
The covers three kinds of uses:
1. Calls of closures from assembly. These are always ABIInternal calls
without wrappers. I went through every indirect call in the runtime
and I think mcall is the only case of assembly calling a Go closure in
a way that's affected by ABIInternal. systemstack also calls a
closure, but it takes no arguments.
2. Calls of Go functions that expect raw ABIInternal pointers. I also
only found one of these: callbackasm1 -> cgocallback on Windows. These
are trickier to find, though.
3. Finally, I found one case on NetBSD where new OS threads were
directly calling the Go runtime entry-point from assembly via a PC,
rather than going through a wrapper. This meant new threads may not
have special registers set up. In this case, a change on all other
OSes had already forced new thread entry to go through an ABI wrapper,
so I just caught NetBSD up with that change.
With this change, I'm able to run a "hello world" with
GOEXPERIMENT=regabi,regabiargs.
For #40724.
Change-Id: I2a6d0e530c4fd4edf13484d923891c6160d683aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/305669
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Diffstat (limited to 'src/runtime/sys_netbsd_arm64.s')
| -rw-r--r-- | src/runtime/sys_netbsd_arm64.s | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/runtime/sys_netbsd_arm64.s b/src/runtime/sys_netbsd_arm64.s index 4d9b05478f..1446a27f4c 100644 --- a/src/runtime/sys_netbsd_arm64.s +++ b/src/runtime/sys_netbsd_arm64.s @@ -76,6 +76,10 @@ nog: MOVD $0, R0 // crash (not reached) MOVD R0, (R8) +TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0 + CALL ·netbsdMstart0(SB) + RET // not reached + TEXT runtime·osyield(SB),NOSPLIT,$0 SVC $SYS_sched_yield RET |