mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-11-26 05:20:30 +00:00
411 lines
10 KiB
C
411 lines
10 KiB
C
/* This file is part of the program psim.
|
|
|
|
Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
*/
|
|
|
|
|
|
/* 32bit target expressions:
|
|
|
|
Each calculation is performed three times using each of the
|
|
signed64, unsigned64 and long integer types. The macro ALU_END
|
|
(in _ALU_RESULT_VAL) then selects which of the three alternative
|
|
results will be used in the final assignment of the target
|
|
register. As this selection is determined at compile time by
|
|
fields in the instruction (OE, EA, Rc) the compiler has sufficient
|
|
information to firstly simplify the selection code into a single
|
|
case and then back anotate the equations and hence eliminate any
|
|
resulting dead code. That dead code being the calculations that,
|
|
as it turned out were not in the end needed.
|
|
|
|
64bit arrithemetic is used firstly because it allows the use of
|
|
gcc's efficient long long operators (typically efficiently output
|
|
inline) and secondly because the resultant answer will contain in
|
|
the low 32bits the answer while in the high 32bits is either carry
|
|
or status information. */
|
|
|
|
/* 64bit target expressions:
|
|
|
|
Unfortunatly 128bit arrithemetic isn't that common. Consequently
|
|
the 32/64 bit trick can not be used. Instead all calculations are
|
|
required to retain carry/overflow information in separate
|
|
variables. Even with this restriction it is still possible for the
|
|
trick of letting the compiler discard the calculation of unneeded
|
|
values */
|
|
|
|
|
|
/* Macro's to type cast 32bit constants to 64bits */
|
|
#define SIGNED64(val) ((signed64)(signed32)(val))
|
|
#define UNSIGNED64(val) ((unsigned64)(unsigned32)(val))
|
|
|
|
|
|
/* Start a section of ALU code */
|
|
|
|
#define ALU_BEGIN(val) \
|
|
{ \
|
|
natural_word alu_val; \
|
|
unsigned64 alu_carry_val; \
|
|
signed64 alu_overflow_val; \
|
|
ALU_SET(val)
|
|
|
|
|
|
/* assign the result to the target register */
|
|
|
|
#define ALU_END(TARG,CA,OE,Rc) \
|
|
{ /* select the result to use */ \
|
|
signed_word const alu_result = _ALU_RESULT_VAL(CA,OE,Rc); \
|
|
/* determine the overflow bit if needed */ \
|
|
if (OE) { \
|
|
if ((((unsigned64)(alu_overflow_val & BIT64(0))) \
|
|
>> 32) \
|
|
== (alu_overflow_val & BIT64(32))) \
|
|
XER &= (~xer_overflow); \
|
|
else \
|
|
XER |= (xer_summary_overflow | xer_overflow); \
|
|
} \
|
|
/* Update the carry bit if needed */ \
|
|
if (CA) { \
|
|
XER = ((XER & ~xer_carry) \
|
|
| SHUFFLED32((alu_carry_val >> 32), 31, xer_carry_bit)); \
|
|
/* if (alu_carry_val & BIT64(31)) \
|
|
XER |= (xer_carry); \
|
|
else \
|
|
XER &= (~xer_carry); */ \
|
|
} \
|
|
TRACE(trace_alu, (" Result = %ld (0x%lx), XER = %ld\n", \
|
|
(long)alu_result, (long)alu_result, (long)XER)); \
|
|
/* Update the Result Conditions if needed */ \
|
|
CR0_COMPARE(alu_result, 0, Rc); \
|
|
/* assign targ same */ \
|
|
TARG = alu_result; \
|
|
}}
|
|
|
|
/* select the result from the different options */
|
|
|
|
#define _ALU_RESULT_VAL(CA,OE,Rc) (WITH_TARGET_WORD_BITSIZE == 64 \
|
|
? alu_val \
|
|
: (OE \
|
|
? alu_overflow_val \
|
|
: (CA \
|
|
? alu_carry_val \
|
|
: alu_val)))
|
|
|
|
|
|
/* More basic alu operations */
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#define ALU_SET(val) \
|
|
do { \
|
|
alu_val = val; \
|
|
alu_carry_val = ((unsigned64)alu_val) >> 32; \
|
|
alu_overflow_val = ((signed64)alu_val) >> 32; \
|
|
} while (0)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_SET(val) \
|
|
do { \
|
|
alu_val = val; \
|
|
alu_carry_val = (unsigned32)(alu_val); \
|
|
alu_overflow_val = (signed32)(alu_val); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#define ALU_ADD(val) \
|
|
do { \
|
|
unsigned64 alu_lo = (UNSIGNED64(alu_val) \
|
|
+ UNSIGNED64(val)); \
|
|
signed alu_carry = ((alu_lo & BIT(31)) != 0); \
|
|
alu_carry_val = (alu_carry_val \
|
|
+ UNSIGNED64(EXTRACTED(val, 0, 31)) \
|
|
+ alu_carry); \
|
|
alu_overflow_val = (alu_overflow_val \
|
|
+ SIGNED64(EXTRACTED(val, 0, 31)) \
|
|
+ alu_carry); \
|
|
alu_val = alu_val + val; \
|
|
} while (0)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_ADD(val) \
|
|
do { \
|
|
alu_val += val; \
|
|
alu_carry_val += (unsigned32)(val); \
|
|
alu_overflow_val += (signed32)(val); \
|
|
} while (0)
|
|
#endif
|
|
|
|
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#define ALU_ADD_CA \
|
|
do { \
|
|
signed carry = MASKED32(XER, xer_carry_bit, xer_carry_bit) != 0; \
|
|
ALU_ADD(carry); \
|
|
} while (0)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_ADD_CA \
|
|
do { \
|
|
signed carry = MASKED32(XER, xer_carry_bit, xer_carry_bit) != 0; \
|
|
ALU_ADD(carry); \
|
|
} while (0)
|
|
#endif
|
|
|
|
|
|
#if 0
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_SUB(val) \
|
|
do { \
|
|
alu_val -= val; \
|
|
alu_carry_val -= (unsigned32)(val); \
|
|
alu_overflow_val -= (signed32)(val); \
|
|
} while (0)
|
|
#endif
|
|
#endif
|
|
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_OR(val) \
|
|
do { \
|
|
alu_val |= val; \
|
|
alu_carry_val = (unsigned32)(alu_val); \
|
|
alu_overflow_val = (signed32)(alu_val); \
|
|
} while (0)
|
|
#endif
|
|
|
|
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_XOR(val) \
|
|
do { \
|
|
alu_val ^= val; \
|
|
alu_carry_val = (unsigned32)(alu_val); \
|
|
alu_overflow_val = (signed32)(alu_val); \
|
|
} while (0)
|
|
#endif
|
|
|
|
|
|
#if 0
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_NEGATE \
|
|
do { \
|
|
alu_val = -alu_val; \
|
|
alu_carry_val = -alu_carry_val; \
|
|
alu_overflow_val = -alu_overflow_val; \
|
|
} while(0)
|
|
#endif
|
|
#endif
|
|
|
|
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_AND(val) \
|
|
do { \
|
|
alu_val &= val; \
|
|
alu_carry_val = (unsigned32)(alu_val); \
|
|
alu_overflow_val = (signed32)(alu_val); \
|
|
} while (0)
|
|
#endif
|
|
|
|
|
|
#if (WITH_TARGET_WORD_BITSIZE == 64)
|
|
#define ALU_NOT \
|
|
do { \
|
|
signed64 new_alu_val = ~alu_val; \
|
|
ALU_SET(new_alu_val); \
|
|
} while (0)
|
|
#endif
|
|
#if (WITH_TARGET_WORD_BITSIZE == 32)
|
|
#define ALU_NOT \
|
|
do { \
|
|
signed new_alu_val = ~alu_val; \
|
|
ALU_SET(new_alu_val); \
|
|
} while(0)
|
|
#endif
|
|
|
|
|
|
/* Macros for updating the condition register */
|
|
|
|
#define CR1_UPDATE(Rc) \
|
|
do { \
|
|
if (Rc) { \
|
|
CR_SET(1, EXTRACTED32(FPSCR, fpscr_fx_bit, fpscr_ox_bit)); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
#define _DO_CR_COMPARE(LHS, RHS) \
|
|
(((LHS) < (RHS)) \
|
|
? cr_i_negative \
|
|
: (((LHS) > (RHS)) \
|
|
? cr_i_positive \
|
|
: cr_i_zero))
|
|
|
|
#define CR_SET(REG, VAL) MBLIT32(CR, REG*4, REG*4+3, VAL)
|
|
#define CR_FIELD(REG) EXTRACTED32(CR, REG*4, REG*4+3)
|
|
#define CR_SET_XER_SO(REG, VAL) \
|
|
do { \
|
|
creg new_bits = ((XER & xer_summary_overflow) \
|
|
? (cr_i_summary_overflow | VAL) \
|
|
: VAL); \
|
|
CR_SET(REG, new_bits); \
|
|
} while(0)
|
|
|
|
#define CR_COMPARE(REG, LHS, RHS) \
|
|
do { \
|
|
creg new_bits = ((XER & xer_summary_overflow) \
|
|
? (cr_i_summary_overflow | _DO_CR_COMPARE(LHS,RHS)) \
|
|
: _DO_CR_COMPARE(LHS,RHS)); \
|
|
CR_SET(REG, new_bits); \
|
|
} while (0)
|
|
|
|
#define CR0_COMPARE(LHS, RHS, Rc) \
|
|
do { \
|
|
if (Rc) { \
|
|
CR_COMPARE(0, LHS, RHS); \
|
|
TRACE(trace_alu, \
|
|
("CR=0x%08lx, LHS=%ld, RHS=%ld\n", \
|
|
(unsigned long)CR, (long)LHS, (long)RHS)); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
|
|
/* Bring data in from the cold */
|
|
|
|
#define MEM(SIGN, EA, NR_BYTES) \
|
|
((SIGN##_##NR_BYTES) vm_data_map_read_##NR_BYTES(cpu_data_map(processor), EA, \
|
|
processor, cia)) \
|
|
|
|
#define STORE(EA, NR_BYTES, VAL) \
|
|
do { \
|
|
vm_data_map_write_##NR_BYTES(cpu_data_map(processor), EA, VAL, \
|
|
processor, cia); \
|
|
} while (0)
|
|
|
|
|
|
|
|
/* some FPSCR update macros. */
|
|
|
|
#define FPSCR_BEGIN \
|
|
{ \
|
|
fpscreg old_fpscr UNUSED = FPSCR
|
|
|
|
#define FPSCR_END(Rc) { \
|
|
/* always update VX */ \
|
|
if ((FPSCR & fpscr_vx_bits)) \
|
|
FPSCR |= fpscr_vx; \
|
|
else \
|
|
FPSCR &= ~fpscr_vx; \
|
|
/* always update FEX */ \
|
|
if (((FPSCR & fpscr_vx) && (FPSCR & fpscr_ve)) \
|
|
|| ((FPSCR & fpscr_ox) && (FPSCR & fpscr_oe)) \
|
|
|| ((FPSCR & fpscr_ux) && (FPSCR & fpscr_ue)) \
|
|
|| ((FPSCR & fpscr_zx) && (FPSCR & fpscr_ze)) \
|
|
|| ((FPSCR & fpscr_xx) && (FPSCR & fpscr_xe))) \
|
|
FPSCR |= fpscr_fex; \
|
|
else \
|
|
FPSCR &= ~fpscr_fex; \
|
|
CR1_UPDATE(Rc); \
|
|
/* interrupt enabled? */ \
|
|
if ((MSR & (msr_floating_point_exception_mode_0 \
|
|
| msr_floating_point_exception_mode_1)) \
|
|
&& (FPSCR & fpscr_fex)) \
|
|
program_interrupt(processor, cia, \
|
|
floating_point_enabled_program_interrupt); \
|
|
}}
|
|
|
|
#define FPSCR_SET(REG, VAL) MBLIT32(FPSCR, REG*4, REG*4+3, VAL)
|
|
#define FPSCR_FIELD(REG) EXTRACTED32(FPSCR, REG*4, REG*4+3)
|
|
|
|
#define FPSCR_SET_FPCC(VAL) MBLIT32(FPSCR, fpscr_fpcc_bit, fpscr_fpcc_bit+3, VAL)
|
|
|
|
/* Handle various exceptions */
|
|
|
|
#define FPSCR_OR_VX(VAL) \
|
|
do { \
|
|
/* NOTE: VAL != 0 */ \
|
|
FPSCR |= (VAL); \
|
|
FPSCR |= fpscr_fx; \
|
|
} while (0)
|
|
|
|
#define FPSCR_SET_OX(COND) \
|
|
do { \
|
|
if (COND) { \
|
|
FPSCR |= fpscr_ox; \
|
|
FPSCR |= fpscr_fx; \
|
|
} \
|
|
else \
|
|
FPSCR &= ~fpscr_ox; \
|
|
} while (0)
|
|
|
|
#define FPSCR_SET_UX(COND) \
|
|
do { \
|
|
if (COND) { \
|
|
FPSCR |= fpscr_ux; \
|
|
FPSCR |= fpscr_fx; \
|
|
} \
|
|
else \
|
|
FPSCR &= ~fpscr_ux; \
|
|
} while (0)
|
|
|
|
#define FPSCR_SET_ZX(COND) \
|
|
do { \
|
|
if (COND) { \
|
|
FPSCR |= fpscr_zx; \
|
|
FPSCR |= fpscr_fx; \
|
|
} \
|
|
else \
|
|
FPSCR &= ~fpscr_zx; \
|
|
} while (0)
|
|
|
|
#define FPSCR_SET_XX(COND) \
|
|
do { \
|
|
if (COND) { \
|
|
FPSCR |= fpscr_xx; \
|
|
FPSCR |= fpscr_fx; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Note: code using SET_FI must also explicitly call SET_XX */
|
|
|
|
#define FPSCR_SET_FR(COND) do { \
|
|
if (COND) \
|
|
FPSCR |= fpscr_fr; \
|
|
else \
|
|
FPSCR &= ~fpscr_fr; \
|
|
} while (0)
|
|
|
|
#define FPSCR_SET_FI(COND) \
|
|
do { \
|
|
if (COND) { \
|
|
FPSCR |= fpscr_fi; \
|
|
} \
|
|
else \
|
|
FPSCR &= ~fpscr_fi; \
|
|
} while (0)
|
|
|
|
#define FPSCR_SET_FPRF(VAL) \
|
|
do { \
|
|
FPSCR = (FPSCR & ~fpscr_fprf) | (VAL); \
|
|
} while (0)
|