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- No alignment check required for 16-byte 'unaligned' access

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This commit is contained in:
Stanislav Shwartsman 2008-09-18 17:37:28 +00:00
parent dd0b8eceb2
commit 39d4db5564
2 changed files with 2 additions and 53 deletions
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28
bochs/cpu/access32.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: access32.cc,v 1.17 2008-09-16 20:57:15 sshwarts Exp $
// $Id: access32.cc,v 1.18 2008-09-18 17:37:28 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2008 Stanislav Shwartsman
@ -279,11 +279,7 @@ accessOK:
laddr = BX_CPU_THIS_PTR get_laddr32(s, offset);
#if BX_SupportGuest2HostTLB
unsigned tlbIndex = BX_TLB_INDEX_OF(laddr, 15);
#if BX_SUPPORT_ALIGNMENT_CHECK && BX_CPU_LEVEL >= 4
Bit32u lpf = AlignedAccessLPFOf(laddr, (15 & BX_CPU_THIS_PTR alignment_check_mask));
#else
Bit32u lpf = LPFOf(laddr);
#endif
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == lpf) {
// See if the TLB entry privilege level allows us write access
@ -305,15 +301,6 @@ accessOK:
}
#endif
#if BX_CPU_LEVEL >= 4 && BX_SUPPORT_ALIGNMENT_CHECK
if (BX_CPU_THIS_PTR alignment_check()) {
if (laddr & 15) {
BX_ERROR(("write_virtual_dqword_32(): #AC misaligned access"));
exception(BX_AC_EXCEPTION, 0, 0);
}
}
#endif
access_write_linear(laddr, 16, CPL, (void *) data);
return;
}
@ -627,11 +614,7 @@ accessOK:
laddr = BX_CPU_THIS_PTR get_laddr32(s, offset);
#if BX_SupportGuest2HostTLB
unsigned tlbIndex = BX_TLB_INDEX_OF(laddr, 15);
#if BX_SUPPORT_ALIGNMENT_CHECK && BX_CPU_LEVEL >= 4
Bit32u lpf = AlignedAccessLPFOf(laddr, (15 & BX_CPU_THIS_PTR alignment_check_mask));
#else
Bit32u lpf = LPFOf(laddr);
#endif
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == lpf) {
// See if the TLB entry privilege level allows us read access
@ -650,15 +633,6 @@ accessOK:
}
#endif
#if BX_CPU_LEVEL >= 4 && BX_SUPPORT_ALIGNMENT_CHECK
if (BX_CPU_THIS_PTR alignment_check()) {
if (laddr & 15) {
BX_ERROR(("read_virtual_dqword_32(): #AC misaligned access"));
exception(BX_AC_EXCEPTION, 0, 0);
}
}
#endif
access_read_linear(laddr, 16, CPL, BX_READ, (void *) data);
return;
}

27
bochs/cpu/access64.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: access64.cc,v 1.19 2008-09-16 20:57:15 sshwarts Exp $
// $Id: access64.cc,v 1.20 2008-09-18 17:37:28 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2008 Stanislav Shwartsman
@ -233,11 +233,7 @@ BX_CPU_C::write_virtual_dqword_64(unsigned s, Bit64u offset, const BxPackedXmmRe
Bit64u laddr = BX_CPU_THIS_PTR get_laddr64(s, offset);
#if BX_SupportGuest2HostTLB
unsigned tlbIndex = BX_TLB_INDEX_OF(laddr, 15);
#if BX_SUPPORT_ALIGNMENT_CHECK && BX_CPU_LEVEL >= 4
Bit64u lpf = AlignedAccessLPFOf(laddr, (15 & BX_CPU_THIS_PTR alignment_check_mask));
#else
Bit64u lpf = LPFOf(laddr);
#endif
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == lpf) {
// See if the TLB entry privilege level allows us write access
@ -264,15 +260,6 @@ BX_CPU_C::write_virtual_dqword_64(unsigned s, Bit64u offset, const BxPackedXmmRe
exception(int_number(s), 0, 0);
}
#if BX_CPU_LEVEL >= 4 && BX_SUPPORT_ALIGNMENT_CHECK
if (BX_CPU_THIS_PTR alignment_check()) {
if (laddr & 15) {
BX_ERROR(("write_virtual_dqword_64(): #AC misaligned access"));
exception(BX_AC_EXCEPTION, 0, 0);
}
}
#endif
access_write_linear(laddr, 16, CPL, (void *) data);
}
@ -516,11 +503,7 @@ BX_CPU_C::read_virtual_dqword_64(unsigned s, Bit64u offset, BxPackedXmmRegister
Bit64u laddr = BX_CPU_THIS_PTR get_laddr64(s, offset);
#if BX_SupportGuest2HostTLB
unsigned tlbIndex = BX_TLB_INDEX_OF(laddr, 15);
#if BX_SUPPORT_ALIGNMENT_CHECK && BX_CPU_LEVEL >= 4
Bit64u lpf = AlignedAccessLPFOf(laddr, (15 & BX_CPU_THIS_PTR alignment_check_mask));
#else
Bit64u lpf = LPFOf(laddr);
#endif
bx_TLB_entry *tlbEntry = &BX_CPU_THIS_PTR TLB.entry[tlbIndex];
if (tlbEntry->lpf == lpf) {
// See if the TLB entry privilege level allows us read access
@ -544,14 +527,6 @@ BX_CPU_C::read_virtual_dqword_64(unsigned s, Bit64u offset, BxPackedXmmRegister
exception(int_number(s), 0, 0);
}
#if BX_CPU_LEVEL >= 4 && BX_SUPPORT_ALIGNMENT_CHECK
if (BX_CPU_THIS_PTR alignment_check()) {
if (laddr & 15) {
BX_ERROR(("read_virtual_dqword_64(): #AC misaligned access"));
exception(BX_AC_EXCEPTION, 0, 0);
}
}
#endif
access_read_linear(laddr, 16, CPL, BX_READ, (void *) data);
}