Date: Sat, 1 Nov 2008 23:14:03 GMT From: Peter Wemm <peter@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 152335 for review Message-ID: <200811012314.mA1NE37l045516@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=152335 Change 152335 by peter@peter_overcee on 2008/11/01 23:13:59 Take a halfway complete shot at implementing async syscall wrappers for amd64. (And sync/reduce-diffs with linux version) Affected files ... .. //depot/projects/valgrind/coregrind/m_syswrap/syscall-amd64-freebsd.S#4 edit Differences ... ==== //depot/projects/valgrind/coregrind/m_syswrap/syscall-amd64-freebsd.S#4 (text+ko) ==== @@ -1,13 +1,13 @@ -##--------------------------------------------------------------------## -##--- Support for doing system calls. syscall-amd64-linux.S ---## -##--------------------------------------------------------------------## +/*--------------------------------------------------------------------*/ +/*--- Support for doing system calls. syscall-amd64-freebsd.S ---*/ +/*--------------------------------------------------------------------*/ /* This file is part of Valgrind, a dynamic binary instrumentation framework. - Copyright (C) 2000-2006 Julian Seward + Copyright (C) 2000-2008 Julian Seward jseward@acm.org This program is free software; you can redistribute it and/or @@ -66,8 +66,20 @@ void* guest_state, // rsi const vki_sigset_t *sysmask, // rdx const vki_sigset_t *postmask, // rcx - Int nsigwords) // r8 - + Int nsigwords, // r8 + SyscallArgs *args) // r9 + +See priv_types_n_macros.h for SyscallArgs layout: + UWord sysno; // 0 + UWord arg1; // 8 + UWord arg2; // 16 + UWord arg3; // 24 + UWord arg4; // 32 + UWord arg5; // 40 + UWord arg6; // 48 + UWord arg7; // 56 + UWord arg8; // 64 + */ /* from vki_arch.h */ @@ -113,13 +125,11 @@ movq $VKI_SIG_SETMASK, %rdi // how movq %rdx, %rsi // sysmask movq %rcx, %rdx // postmask - movq %r8, %r10 // nsigwords syscall POP_di_si_dx_cx_8 - testq %rax, %rax - js 7f /* sigprocmask failed */ + jb 7f /* sigprocmask failed */ /* OK, that worked. Now do the syscall proper. */ @@ -144,8 +154,13 @@ POP_di_si_dx_cx_8 + pushf + popq %r15 movq %rax, OFFSET_amd64_RAX(%rsi) /* save back to RAX */ + movq %rdx, OFFSET_amd64_RDX(%rsi) /* save back to RDX */ + /* QQQ Race here. see syscall-x86-freebsd.S comment */ + 4: /* Re-block signals. If eip is in [4,5), then the syscall is complete and we needn't worry about it. */ @@ -155,15 +170,22 @@ movq $VKI_SIG_SETMASK, %rdi // how movq %rcx, %rsi // postmask xorq %rdx, %rdx // NULL - movq %r8, %r10 // nsigwords syscall POP_di_si_dx_cx_8 - testq %rax, %rax - js 7f /* sigprocmask failed */ + jb 7f /* sigprocmask failed */ 5: /* now safe from signals */ + + PUSH_di_si_dx_cx_8 + /* Export carry state */ + movq %r15,%rdi + andq $1, %rdi + /* rsi still --> VexGuestAMD64State * */ + call LibVEX_GuestAMD64_put_rflag_c + POP_di_si_dx_cx_8 + movq $0, %rax /* SUCCESS */ popq %r15 popq %r14 @@ -174,8 +196,6 @@ ret 7: /* failure: return 0x8000 | error code */ - negq %rax - andq $0x7FFF, %rax orq $0x8000, %rax popq %r15 popq %r14 @@ -206,6 +226,6 @@ /* Let the linker know we don't need an executable stack */ .section .note.GNU-stack,"",@progbits -##--------------------------------------------------------------------## -##--- end ---## -##--------------------------------------------------------------------## +/*--------------------------------------------------------------------*/ +/*--- end ---*/ +/*--------------------------------------------------------------------*/
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