Mercurial > hg > truffle
comparison src/os_cpu/bsd_x86/vm/bsd_x86_32.s @ 11127:980532a806a5
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 | 436b4a3231bf |
| children | de6a9e811145 |
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| 11088:ea4d24c1e0c6 | 11127:980532a806a5 |
|---|---|
| 60 SYMBOL(fixcw): | 60 SYMBOL(fixcw): |
| 61 pushl $0x27f | 61 pushl $0x27f |
| 62 fldcw 0(%esp) | 62 fldcw 0(%esp) |
| 63 popl %eax | 63 popl %eax |
| 64 ret | 64 ret |
| 65 | |
| 66 .globl SYMBOL(SafeFetch32), SYMBOL(Fetch32PFI), SYMBOL(Fetch32Resume) | |
| 67 .globl SYMBOL(SafeFetchN) | |
| 68 ## TODO: avoid exposing Fetch32PFI and Fetch32Resume. | |
| 69 ## Instead, the signal handler would call a new SafeFetchTriage(FaultingEIP) | |
| 70 ## routine to vet the address. If the address is the faulting LD then | |
| 71 ## SafeFetchTriage() would return the resume-at EIP, otherwise null. | |
| 72 ELF_TYPE(SafeFetch32,@function) | |
| 73 .p2align 4,,15 | |
| 74 SYMBOL(SafeFetch32): | |
| 75 SYMBOL(SafeFetchN): | |
| 76 movl 0x8(%esp), %eax | |
| 77 movl 0x4(%esp), %ecx | |
| 78 SYMBOL(Fetch32PFI): | |
| 79 movl (%ecx), %eax | |
| 80 SYMBOL(Fetch32Resume): | |
| 81 ret | |
| 82 | |
| 83 | 65 |
| 84 .globl SYMBOL(SpinPause) | 66 .globl SYMBOL(SpinPause) |
| 85 ELF_TYPE(SpinPause,@function) | 67 ELF_TYPE(SpinPause,@function) |
| 86 .p2align 4,,15 | 68 .p2align 4,,15 |
| 87 SYMBOL(SpinPause): | 69 SYMBOL(SpinPause): |