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8016697: Use stubs to implement safefetch Summary: Implement Safefetch as stub routines. This reduces compiler and os dependencies. Reviewed-by: twisti, kvn
author goetz
date Thu, 20 Jun 2013 15:02:05 +0200
parents c18cbe5936b8
children de6a9e811145
comparison
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11088:ea4d24c1e0c6 11127:980532a806a5
18 # 18 #
19 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 # or visit www.oracle.com if you need additional information or have any 20 # or visit www.oracle.com if you need additional information or have any
21 # questions. 21 # questions.
22 # 22 #
23
24 # Prototype: int SafeFetch32 (int * adr, int ErrValue)
25 # The "ld" at Fetch32 is potentially faulting instruction.
26 # If the instruction traps the trap handler will arrange
27 # for control to resume at Fetch32Resume.
28 # By convention with the trap handler we ensure there is a non-CTI
29 # instruction in the trap shadow.
30
31
32 .globl SafeFetch32, Fetch32PFI, Fetch32Resume
33 .globl SafeFetchN
34 .align 32
35 .type SafeFetch32,@function
36 SafeFetch32:
37 mov %o0, %g1
38 mov %o1, %o0
39 Fetch32PFI:
40 # <-- Potentially faulting instruction
41 ld [%g1], %o0
42 Fetch32Resume:
43 nop
44 retl
45 nop
46
47 .globl SafeFetchN, FetchNPFI, FetchNResume
48 .type SafeFetchN,@function
49 .align 32
50 SafeFetchN:
51 mov %o0, %g1
52 mov %o1, %o0
53 FetchNPFI:
54 ldn [%g1], %o0
55 FetchNResume:
56 nop
57 retl
58 nop
59 23
60 # Possibilities: 24 # Possibilities:
61 # -- membar 25 # -- membar
62 # -- CAS (SP + BIAS, G0, G0) 26 # -- CAS (SP + BIAS, G0, G0)
63 # -- wr %g0, %asi 27 # -- wr %g0, %asi