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Implemented CALL FAR in 64-bit mode

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This commit is contained in:
Stanislav Shwartsman 2005-08-04 19:38:51 +00:00
parent b8485d5f98
commit ea30a3ef06
3 changed files with 168 additions and 76 deletions
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231
bochs/cpu/call_far.cc
View File

@ -1,5 +1,5 @@
////////////////////////////////////////////////////////////////////////
// $Id: call_far.cc,v 1.5 2005-08-03 21:10:39 sshwarts Exp $
// $Id: call_far.cc,v 1.6 2005-08-04 19:38:49 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -92,8 +92,8 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
return;
}
else { // gate & special segment
bx_descriptor_t gate_descriptor;
bx_selector_t gate_selector;
bx_descriptor_t gate_descriptor = cs_descriptor;
bx_selector_t gate_selector = cs_selector;
Bit32u new_EIP;
Bit16u dest_selector;
Bit16u raw_tss_selector;
@ -101,10 +101,6 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
bx_descriptor_t tss_descriptor;
Bit32u temp_eIP;
/* 1 level of indirection via gate, switch gate & cs */
gate_descriptor = cs_descriptor;
gate_selector = cs_selector;
// descriptor DPL must be >= CPL else #GP(gate selector)
if (gate_descriptor.dpl < CPL) {
BX_ERROR(("call_protected: descriptor.dpl < CPL"));
@ -130,7 +126,8 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
exception(BX_GP_EXCEPTION, cs_raw & 0xfffc, 0);
}
else {
BX_PANIC(("call protected: call gate 64 still not implemented !"));
call_gate64(&gate_descriptor);
return;
}
}
#endif
@ -242,17 +239,6 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
exception(BX_GP_EXCEPTION, dest_selector & 0xfffc, 0);
}
// In long mode, only 64-bit call gates are allowed, and they must point
// to 64-bit code segments, else #GP(selector)
#if BX_SUPPORT_X86_64
if (!IsLongMode()) {
if (! IS_LONG64_SEGMENT(cs_descriptor) || cs_descriptor.u.segment.d_b)
{
BX_ERROR(("jump_protected: not 64-bit code segment in call gate 64"));
exception(BX_GP_EXCEPTION, dest_selector & 0xfffc, 0);
}
}
#endif
// code segment must be present else #NP(selector)
if (! IS_PRESENT(cs_descriptor)) {
BX_ERROR(("call_protected: code segment not present !"));
@ -268,8 +254,7 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
Bit32u ESP_for_cpl_x;
bx_selector_t ss_selector;
bx_descriptor_t ss_descriptor;
unsigned room_needed;
Bit8u param_count;
unsigned room_needed, param_count;
Bit16u return_SS, return_CS;
Bit32u return_ESP, return_EIP;
Bit32u return_ss_base;
@ -290,10 +275,8 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
// check selector & descriptor for new SS:
// selector must not be null, else #TS(0)
if ( (SS_for_cpl_x & 0xfffc) == 0 ) {
if (! IsLongMode()) {
BX_ERROR(("call_protected: new SS null"));
exception(BX_TS_EXCEPTION, 0, 0);
}
BX_ERROR(("call_protected: new SS null"));
exception(BX_TS_EXCEPTION, 0, 0);
}
// selector index must be within its descriptor table limits,
@ -302,37 +285,34 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
fetch_raw_descriptor(&ss_selector, &dword1, &dword2, BX_TS_EXCEPTION);
parse_descriptor(dword1, dword2, &ss_descriptor);
if (! IsLongMode())
// selector's RPL must equal DPL of code segment,
// else #TS(SS selector)
if (ss_selector.rpl != cs_descriptor.dpl) {
BX_DEBUG(("call_protected: SS selector.rpl != CS descr.dpl"));
exception(BX_TS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
// stack segment DPL must equal DPL of code segment,
// else #TS(SS selector)
if (ss_descriptor.dpl != cs_descriptor.dpl) {
BX_ERROR(("call_protected: SS descr.rpl != CS descr.dpl"));
exception(BX_TS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
// descriptor must indicate writable data segment,
// else #TS(SS selector)
if (ss_descriptor.valid==0 || ss_descriptor.segment==0 ||
ss_descriptor.u.segment.executable ||
ss_descriptor.u.segment.r_w==0)
{
// selector's RPL must equal DPL of code segment,
// else #TS(SS selector)
if (ss_selector.rpl != cs_descriptor.dpl) {
BX_DEBUG(("call_protected: SS selector.rpl != CS descr.dpl"));
exception(BX_TS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
BX_ERROR(("call_protected: ss descriptor not writable data seg"));
exception(BX_TS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
// stack segment DPL must equal DPL of code segment,
// else #TS(SS selector)
if (ss_descriptor.dpl != cs_descriptor.dpl) {
BX_ERROR(("call_protected: SS descr.rpl != CS descr.dpl"));
exception(BX_TS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
// descriptor must indicate writable data segment,
// else #TS(SS selector)
if (ss_descriptor.valid==0 || ss_descriptor.segment==0 ||
ss_descriptor.u.segment.executable ||
ss_descriptor.u.segment.r_w==0)
{
BX_ERROR(("call_protected: ss descriptor not writable data seg"));
exception(BX_TS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
// segment must be present, else #SS(SS selector)
if (! IS_PRESENT(ss_descriptor)) {
BX_ERROR(("call_protected: ss descriptor not present"));
exception(BX_SS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
// segment must be present, else #SS(SS selector)
if (! IS_PRESENT(ss_descriptor)) {
BX_ERROR(("call_protected: ss descriptor not present"));
exception(BX_SS_EXCEPTION, SS_for_cpl_x & 0xfffc, 0);
}
if ( cs_descriptor.u.segment.d_b )
@ -430,19 +410,15 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
for (unsigned i=param_count; i>0; i--) {
push_16(parameter_word[i-1]);
}
// push return address onto new stack
push_16(return_CS);
push_16((Bit16u) return_EIP);
}
else {
for (unsigned i=param_count; i>0; i--) {
push_32(parameter_dword[i-1]);
}
}
// push return address onto new stack
if (gate_descriptor.type==BX_286_CALL_GATE) {
push_16(return_CS);
push_16((Bit16u) return_EIP);
}
else {
// push return address onto new stack
push_32(return_CS);
push_32(return_EIP);
}
@ -454,14 +430,6 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
{
BX_DEBUG(("CALL GATE TO SAME PRIVILEGE"));
#if BX_SUPPORT_X86_64
if (BX_CPU_THIS_PTR cpu_mode == BX_MODE_LONG_64) {
// call gate 64bit, push return address onto stack
push_64(BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value);
push_64(RIP);
}
else
#endif
if (gate_descriptor.type == BX_386_CALL_GATE) {
// call gate 32bit, push return address onto stack
push_32(BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value);
@ -476,7 +444,7 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
// load CS:EIP from gate
// load code segment descriptor into CS register
// set RPL of CS to CPL
branch_far64(&cs_selector, &cs_descriptor, new_EIP, CPL);
branch_far32(&cs_selector, &cs_descriptor, new_EIP, CPL);
}
return;
@ -486,3 +454,124 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
}
}
}
#if BX_SUPPORT_X86_64
void BX_CPP_AttrRegparmN(1)
BX_CPU_C::call_gate64(bx_descriptor_t *gate_descriptor)
{
bx_selector_t cs_selector;
Bit32u dword1, dword2, dword3;
bx_descriptor_t cs_descriptor;
// examine code segment selector in call gate descriptor
BX_DEBUG(("call_gate64: CALL 64bit call gate"));
Bit16u dest_selector = gate_descriptor->u.gate386.dest_selector;
// selector must not be null else #GP(0)
if ( (dest_selector & 0xfffc) == 0 ) {
BX_ERROR(("call_gate64: selector in gate null"));
exception(BX_GP_EXCEPTION, 0, 0);
}
parse_selector(dest_selector, &cs_selector);
// selector must be within its descriptor table limits,
// else #GP(code segment selector)
fetch_raw_descriptor64(&cs_selector, &dword1, &dword2, &dword3, BX_GP_EXCEPTION);
parse_descriptor(dword1, dword2, &cs_descriptor);
Bit64u new_RIP = gate_descriptor->u.gate386.dest_offset;
new_RIP |= ((Bit64u)dword3 << 32);
// AR byte of selected descriptor must indicate code segment,
// else #GP(code segment selector)
// DPL of selected descriptor must be <= CPL,
// else #GP(code segment selector)
if (cs_descriptor.valid==0 || cs_descriptor.segment==0 ||
cs_descriptor.u.segment.executable==0 ||
cs_descriptor.dpl > CPL)
{
BX_ERROR(("call_gate64: selected descriptor is not code"));
exception(BX_GP_EXCEPTION, dest_selector & 0xfffc, 0);
}
// In long mode, only 64-bit call gates are allowed, and they must point
// to 64-bit code segments, else #GP(selector)
if (! IS_LONG64_SEGMENT(cs_descriptor) || cs_descriptor.u.segment.d_b)
{
BX_ERROR(("call_gate64: not 64-bit code segment in call gate 64"));
exception(BX_GP_EXCEPTION, dest_selector & 0xfffc, 0);
}
// code segment must be present else #NP(selector)
if (! IS_PRESENT(cs_descriptor)) {
BX_ERROR(("call_gate64: code segment not present !"));
exception(BX_NP_EXCEPTION, dest_selector & 0xfffc, 0);
}
Bit16u old_CS = BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value;
Bit64u old_RIP = RIP;
// CALL GATE TO MORE PRIVILEGE
// if non-conforming code segment and DPL < CPL then
if ( (cs_descriptor.u.segment.c_ed==0) &&
(cs_descriptor.dpl < CPL) )
{
Bit64u RSP_for_cpl_x;
BX_DEBUG(("CALL GATE TO MORE PRIVILEGE LEVEL"));
// get new RSP for new privilege level from TSS
get_RSP_from_TSS(cs_descriptor.dpl, &RSP_for_cpl_x);
if (! IsCanonical(RSP_for_cpl_x)) {
BX_ERROR(("call_gate64: canonical address failure %08x%08x",
(Bit32u)(RSP_for_cpl_x >> 32), (Bit32u)(RSP_for_cpl_x & 0xffffffff)));
exception(BX_GP_EXCEPTION, 0, 0);
}
Bit16u old_SS = BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.value;
Bit64u old_RSP = RSP;
bx_selector_t ss_selector;
bx_descriptor_t ss_descriptor;
// set up a null descriptor
parse_selector(0, &ss_selector);
parse_descriptor(0, 0, &ss_descriptor);
// load CS:RIP (guaranteed to be in 64 bit mode)
branch_far64(&cs_selector, &cs_descriptor, new_RIP, cs_descriptor.dpl);
// set up null SS descriptor
load_ss(&ss_selector, &ss_descriptor, cs_descriptor.dpl);
RSP = RSP_for_cpl_x;
// push old stack long pointer onto new stack
push_64(old_SS);
push_64(old_RSP);
// push long pointer to return address onto new stack
push_64(old_CS);
push_64(old_RIP);
}
else
{
BX_DEBUG(("CALL GATE TO SAME PRIVILEGE"));
// make sure that push CS:RIP will not fail
if (! IsCanonical(RSP)) {
BX_ERROR(("call_gate64: canonical address failure %08x%08x",
(Bit32u)(RSP >> 32), (Bit32u)(RSP & 0xffffffff)));
exception(BX_GP_EXCEPTION, 0, 0);
}
// load CS:RIP (guaranteed to be in 64 bit mode)
branch_far64(&cs_selector, &cs_descriptor, new_RIP, CPL);
// push return address onto stack
push_64(old_CS);
push_64(old_RIP);
}
}
#endif

5
bochs/cpu/cpu.h
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: cpu.h,v 1.232 2005-08-03 21:19:10 sshwarts Exp $
// $Id: cpu.h,v 1.233 2005-08-04 19:38:49 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -2743,6 +2743,9 @@ public: // for now...
BX_SMF void jmp_call_gate64(bx_descriptor_t *gate_descriptor) BX_CPP_AttrRegparmN(1);
#endif
BX_SMF void call_protected(bxInstruction_c *, Bit16u cs, bx_address disp) BX_CPP_AttrRegparmN(3);
#if BX_SUPPORT_X86_64
BX_SMF void call_gate64(bx_descriptor_t *gate_descriptor) BX_CPP_AttrRegparmN(1);
#endif
BX_SMF void return_protected(bxInstruction_c *, Bit16u pop_bytes) BX_CPP_AttrRegparmN(2);
BX_SMF void iret_protected(bxInstruction_c *) BX_CPP_AttrRegparmN(1);
#if BX_SUPPORT_X86_64

8
bochs/cpu/ctrl_xfer64.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: ctrl_xfer64.cc,v 1.38 2005-07-31 17:57:25 sshwarts Exp $
// $Id: ctrl_xfer64.cc,v 1.39 2005-08-04 19:38:51 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -98,7 +98,7 @@ void BX_CPU_C::RETfar64_Iw(bxInstruction_c *i)
BX_ASSERT(protected_mode());
BX_INFO(("RETF64_Iw instruction executed ..."));
BX_INFO(("RETfar64_Iw instruction executed ..."));
return_protected(i, i->Iw());
@ -116,7 +116,7 @@ void BX_CPU_C::RETfar64(bxInstruction_c *i)
BX_ASSERT(protected_mode());
BX_INFO(("RETF64 instruction executed ..."));
BX_INFO(("RETfar64 instruction executed ..."));
return_protected(i, 0);
@ -199,7 +199,7 @@ void BX_CPU_C::CALL64_Ep(bxInstruction_c *i)
BX_ASSERT(protected_mode());
BX_PANIC(("Call protected is not implemented in x86-64 mode !"));
BX_INFO(("call far instruction executed ..."));
BX_CPU_THIS_PTR call_protected(i, cs_raw, op1_32);
BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_CALL,