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sim-se: Refactor clone to avoid most ifdefs

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Some parts of clone are architecture dependent. In some cases, we are
able to use architecture-specific helper functions or register
aliases. However, there is still some architecture-specific that is
protected by ifdefs in the common clone implementation.

Move these architecture-specific bits to the architecture-specific OS
class instead to avoid these ifdefs and make the code a bit more
readable.

Change-Id: Ia0903d738d0ba890863bddfa77e3b717db7f45de
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Cc: Giacomo Travaglini <giacomo.travaglini@arm.com>
Cc: Javier Setoain <javier.setoain@arm.com>
Cc: Brandon Potter <Brandon.Potter@amd.com>
Reviewed-on: https://gem5-review.googlesource.com/c/15435
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Brandon Potter <Brandon.Potter@amd.com>
This commit is contained in:
Andreas Sandberg
2019-01-09 14:50:27 +00:00
parent 13daa2e062
commit 0a36956261
6 changed files with 93 additions and 33 deletions
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32
src/sim/syscall_emul.hh
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@@ -1279,11 +1279,11 @@ cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
* The flag defines the list of clone() arguments in the following
* order: flags -> newStack -> ptidPtr -> tlsPtr -> ctidPtr
*/
Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index);
Addr tlsPtr = p->getSyscallArg(tc, index);
Addr ctidPtr = p->getSyscallArg(tc, index);
#else
Addr ctidPtr = p->getSyscallArg(tc, index);
Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index);
Addr tlsPtr = p->getSyscallArg(tc, index);
#endif
if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) ||
@@ -1365,33 +1365,7 @@ cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc)
ctc->clearArchRegs();
#if THE_ISA == ALPHA_ISA
TheISA::copyMiscRegs(tc, ctc);
#elif THE_ISA == SPARC_ISA
TheISA::copyRegs(tc, ctc);
ctc->setIntReg(TheISA::NumIntArchRegs + 6, 0);
ctc->setIntReg(TheISA::NumIntArchRegs + 4, 0);
ctc->setIntReg(TheISA::NumIntArchRegs + 3, TheISA::NWindows - 2);
ctc->setIntReg(TheISA::NumIntArchRegs + 5, TheISA::NWindows);
ctc->setMiscReg(TheISA::MISCREG_CWP, 0);
ctc->setIntReg(TheISA::NumIntArchRegs + 7, 0);
ctc->setMiscRegNoEffect(TheISA::MISCREG_TL, 0);
ctc->setMiscReg(TheISA::MISCREG_ASI, TheISA::ASI_PRIMARY);
for (int y = 8; y < 32; y++)
ctc->setIntReg(y, tc->readIntReg(y));
#elif THE_ISA == ARM_ISA or THE_ISA == X86_ISA or THE_ISA == RISCV_ISA
TheISA::copyRegs(tc, ctc);
#endif
#if THE_ISA == X86_ISA
if (flags & OS::TGT_CLONE_SETTLS) {
ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_BASE, tlsPtr);
ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_EFF_BASE, tlsPtr);
}
#endif
if (newStack)
ctc->setIntReg(TheISA::StackPointerReg, newStack);
OS::archClone(flags, p, cp, tc, ctc, newStack, tlsPtr);
cp->setSyscallReturn(ctc, 0);