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author | Richard Sandiford <rdsandiford@googlemail.com> | 2004-03-29 21:56:02 +0000 |
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committer | Richard Sandiford <rdsandiford@googlemail.com> | 2004-03-29 21:56:02 +0000 |
commit | 0e1b7197a41626c931f433e9d09333426d984676 (patch) | |
tree | e0555984f9b9ac74b3d16c5ece6e91b87d69909b /sim/mips/mips.igen | |
parent | 9b0de91afe415d014e858bf39900420d91328721 (diff) | |
download | fsf-binutils-gdb-0e1b7197a41626c931f433e9d09333426d984676.zip fsf-binutils-gdb-0e1b7197a41626c931f433e9d09333426d984676.tar.gz fsf-binutils-gdb-0e1b7197a41626c931f433e9d09333426d984676.tar.bz2 |
* sim-main.h (MIPS_MACH_HAS_MT_HILO_HAZARD)
(MIPS_MACH_HAS_MULT_HILO_HAZARD, MIPS_MACH_HAS_DIV_HILO_HAZARD): New.
* mips.igen (check_mt_hilo, check_mult_hilo, check_div_hilo): Provide
separate implementations for mipsIV and mipsV. Use new macros to
determine whether the restrictions apply.
Diffstat (limited to 'sim/mips/mips.igen')
-rw-r--r-- | sim/mips/mips.igen | 64 |
1 files changed, 51 insertions, 13 deletions
diff --git a/sim/mips/mips.igen b/sim/mips/mips.igen index cfc2d6d..95ec575 100644 --- a/sim/mips/mips.igen +++ b/sim/mips/mips.igen @@ -238,13 +238,15 @@ // On the r3900, restriction (2) is not present, and restriction (3) is not // present for multiplication. // -// For now this code is paranoid. Historically the simulator -// enforced restrictions (2) and (3) for more ISAs and CPU types than -// necessary. Unfortunately, at least some MIPS IV and later parts' -// documentation describes them as having these hazards (e.g. vr5000), -// so they can't be removed for at leats MIPS IV. MIPS V hasn't been -// checked (since there are no known hardware implementations). -// +// Unfortunately, there seems to be some confusion about whether the last +// two restrictions should apply to "MIPS IV" as well. One edition of +// the MIPS IV ISA says they do, but references in later ISA documents +// suggest they don't. +// +// In reality, some MIPS IV parts, such as the VR5000 and VR5400, do have +// these restrictions, while others, like the VR5500, don't. To accomodate +// such differences, the MIPS IV and MIPS V version of these helper functions +// use auxillary routines to determine whether the restriction applies. // check_mf_cycles: // @@ -274,8 +276,6 @@ *mipsI: *mipsII: *mipsIII: -*mipsIV: -*mipsV: *vr4100: *vr5000: { @@ -287,6 +287,18 @@ } :function:::int:check_mt_hilo:hilo_history *history +*mipsIV: +*mipsV: +{ + signed64 time = sim_events_time (SD); + int ok = (! MIPS_MACH_HAS_MT_HILO_HAZARD (SD) + || check_mf_cycles (SD_, history, time, "MT")); + history->mt.timestamp = time; + history->mt.cia = CIA; + return ok; +} + +:function:::int:check_mt_hilo:hilo_history *history *mips32: *mips64: *r3900: @@ -350,8 +362,6 @@ *mipsI: *mipsII: *mipsIII: -*mipsIV: -*mipsV: *vr4100: *vr5000: { @@ -366,6 +376,21 @@ } :function:::int:check_mult_hilo:hilo_history *hi, hilo_history *lo +*mipsIV: +*mipsV: +{ + signed64 time = sim_events_time (SD); + int ok = (! MIPS_MACH_HAS_MULT_HILO_HAZARD (SD) + || (check_mf_cycles (SD_, hi, time, "OP") + && check_mf_cycles (SD_, lo, time, "OP"))); + hi->op.timestamp = time; + lo->op.timestamp = time; + hi->op.cia = CIA; + lo->op.cia = CIA; + return ok; +} + +:function:::int:check_mult_hilo:hilo_history *hi, hilo_history *lo *mips32: *mips64: *r3900: @@ -389,8 +414,6 @@ *mipsI: *mipsII: *mipsIII: -*mipsIV: -*mipsV: *vr4100: *vr5000: *r3900: @@ -406,6 +429,21 @@ } :function:::int:check_div_hilo:hilo_history *hi, hilo_history *lo +*mipsIV: +*mipsV: +{ + signed64 time = sim_events_time (SD); + int ok = (! MIPS_MACH_HAS_DIV_HILO_HAZARD (SD) + || (check_mf_cycles (SD_, hi, time, "OP") + && check_mf_cycles (SD_, lo, time, "OP"))); + hi->op.timestamp = time; + lo->op.timestamp = time; + hi->op.cia = CIA; + lo->op.cia = CIA; + return ok; +} + +:function:::int:check_div_hilo:hilo_history *hi, hilo_history *lo *mips32: *mips64: { |