qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-18 01:34:44 -07:00
Code Releases Activity

runtime: don't use R11 in nanotime1/walltime1 on ARM

Browse Source 
R11 a.k.a. REGTMP is the temp register used by the assembler. It
may be clobbered if the assembler needs to synthesize
instructions. In particular, in nanotime1/walltime1, the load of
global variable runtime.iscgo clobbers it. So, avoid using R11
to hold a long-lived value.

Fixes #36309.

Change-Id: Iec2ab9d664532cad8fbf58da17f580e64a744f62
Reviewed-on: https://go-review.googlesource.com/c/go/+/212641
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Andrew G. Morgan <agm@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Cherry Zhang 2019-12-30 11:26:17 -05:00
parent 9df93e4d6d
commit 2ee2c6232c
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
src/runtime/sys_linux_arm.s
View File

@ -269,8 +269,8 @@ noswitch:
MOVW $CLOCK_REALTIME, R0
MOVW $8(R13), R1 // timespec
MOVW runtime·vdsoClockgettimeSym(SB), R11
CMP $0, R11
MOVW runtime·vdsoClockgettimeSym(SB), R2
CMP $0, R2
B.EQ fallback
// Store g on gsignal's stack, so if we receive a signal
@ -292,7 +292,7 @@ noswitch:
MOVW (g_stack+stack_lo)(R6), R6 // g.m.gsignal.stack.lo
MOVW g, (R6)
BL (R11)
BL (R2)
MOVW $0, R1
MOVW R1, (R6) // clear g slot, R6 is unchanged by C code
@ -300,7 +300,7 @@ noswitch:
JMP finish
nosaveg:
BL (R11)
BL (R2)
JMP finish
fallback:
@ -347,8 +347,8 @@ noswitch:
MOVW $CLOCK_MONOTONIC, R0
MOVW $8(R13), R1 // timespec
MOVW runtime·vdsoClockgettimeSym(SB), R11
CMP $0, R11
MOVW runtime·vdsoClockgettimeSym(SB), R2
CMP $0, R2
B.EQ fallback
// Store g on gsignal's stack, so if we receive a signal
@ -370,7 +370,7 @@ noswitch:
MOVW (g_stack+stack_lo)(R6), R6 // g.m.gsignal.stack.lo
MOVW g, (R6)
BL (R11)
BL (R2)
MOVW $0, R1
MOVW R1, (R6) // clear g slot, R6 is unchanged by C code
@ -378,7 +378,7 @@ noswitch:
JMP finish
nosaveg:
BL (R11)
BL (R2)
JMP finish
fallback: