archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-23 12:34:32 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8016697: Use stubs to implement safefetch

Browse source 
Implement Safefetch as stub routines. This reduces compiler and os dependencies.

Reviewed-by: twisti, kvn
This commit is contained in:
Goetz Lindenmaier 2013-06-20 15:02:05 +02:00
parent b5efe058f7
commit ef69ce852c
21 changed files with 231 additions and 304 deletions
Download patch file Download diff file Expand all files Collapse all files

36
hotspot/src/os_cpu/linux_sparc/vm/linux_sparc.s
View file

@ -21,42 +21,6 @@
# questions.
#
# Prototype: int SafeFetch32 (int * adr, int ErrValue)
# The "ld" at Fetch32 is potentially faulting instruction.
# If the instruction traps the trap handler will arrange
# for control to resume at Fetch32Resume.
# By convention with the trap handler we ensure there is a non-CTI
# instruction in the trap shadow.
.globl SafeFetch32, Fetch32PFI, Fetch32Resume
.globl SafeFetchN
.align 32
.type SafeFetch32,@function
SafeFetch32:
mov %o0, %g1
mov %o1, %o0
Fetch32PFI:
# <-- Potentially faulting instruction
ld [%g1], %o0
Fetch32Resume:
nop
retl
nop
.globl SafeFetchN, FetchNPFI, FetchNResume
.type SafeFetchN,@function
.align 32
SafeFetchN:
mov %o0, %g1
mov %o1, %o0
FetchNPFI:
ldn [%g1], %o0
FetchNResume:
nop
retl
nop
# Possibilities:
# -- membar
# -- CAS (SP + BIAS, G0, G0)

13
hotspot/src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp
View file

@ -366,18 +366,9 @@ intptr_t* os::Linux::ucontext_get_fp(ucontext_t *uc) {
// Utility functions
extern "C" void Fetch32PFI();
extern "C" void Fetch32Resume();
extern "C" void FetchNPFI();
extern "C" void FetchNResume();
inline static bool checkPrefetch(sigcontext* uc, address pc) {
if (pc == (address) Fetch32PFI) {
set_cont_address(uc, address(Fetch32Resume));
return true;
}
if (pc == (address) FetchNPFI) {
set_cont_address(uc, address(FetchNResume));
if (StubRoutines::is_safefetch_fault(pc)) {
set_cont_address(uc, address(StubRoutines::continuation_for_safefetch_fault(pc)));
return true;
}
return false;