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|
/* ASSIST.C (c) Copyright Roger Bowler, 1999-2005 */
/* ESA/390 MVS Assist Routines */
/*-------------------------------------------------------------------*/
/* This module contains routines which process the MVS Assist */
/* instructions described in the manual GA22-7079-01. */
/*-------------------------------------------------------------------*/
/* Instruction decode rework - Jan Jaeger */
/* Correct address wraparound - Jan Jaeger */
/* z/Architecture support - (c) Copyright Jan Jaeger, 1999-2005 */
/* Add dummy assist instruction - Jay Maynard, */
/* suggested by Brandon Hill */
#include "hstdinc.h"
#if !defined(_HENGINE_DLL_)
#define _HENGINE_DLL_
#endif
#if !defined(_ASSIST_C_)
#define _ASSIST_C_
#endif
#include "hercules.h"
#include "opcode.h"
#include "inline.h"
#if !defined(_ASSIST_C)
#define _ASSIST_C
/*-------------------------------------------------------------------*/
/* Control block offsets fixed by architecture */
/*-------------------------------------------------------------------*/
/* Prefixed storage area offsets */
#define PSALCPUA 0x2F4 /* Logical CPU address */
#define PSAHLHI 0x2F8 /* Locks held indicators */
/* Bit settings for PSAHLHI */
#define PSACMSLI 0x00000002 /* CMS lock held indicator */
#define PSALCLLI 0x00000001 /* Local lock held indicator */
/* Address space control block offsets */
#define ASCBLOCK 0x080 /* Local lock */
#define ASCBLSWQ 0x084 /* Local lock suspend queue */
/* Lock interface table offsets */
#define LITOLOC (-16) /* Obtain local error exit */
#define LITRLOC (-12) /* Release local error exit */
#define LITOCMS (-8) /* Obtain CMS error exit */
#define LITRCMS (-4) /* Release CMS error exit */
#endif /*!defined(_ASSIST_C)*/
#if !defined(FEATURE_S390_DAT) && !defined(FEATURE_ESAME)
/*-------------------------------------------------------------------*/
/* E502 - Page Fix [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(fix_page)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/*INCOMPLETE*/
}
#endif /*!defined(FEATURE_S390_DAT) && !defined(FEATURE_ESAME)*/
/*-------------------------------------------------------------------*/
/* E503 - SVC assist [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(svc_assist)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/*INCOMPLETE: NO ACTION IS TAKEN, THE SVC IS UNASSISTED
AND MVS WILL HAVE TO HANDLE THE SITUATION*/
}
/*-------------------------------------------------------------------*/
/* E504 - Obtain Local Lock [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(obtain_local_lock)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
VADR ascb_addr; /* Virtual address of ASCB */
VADR lock_addr; /* Virtual addr of ASCBLOCK */
U32 hlhi_word; /* Highest lock held word */
VADR lit_addr; /* Virtual address of lock
interface table */
U32 lock; /* Lock value */
U32 lcpa; /* Logical CPU address */
VADR newia; /* Unsuccessful branch addr */
int acc_mode = 0; /* access mode to use */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
PERFORM_SERIALIZATION(regs);
/* Obtain main-storage access lock */
OBTAIN_MAINLOCK(regs);
if (ACCESS_REGISTER_MODE(®s->psw))
acc_mode = USE_PRIMARY_SPACE;
/* Load ASCB address from first operand location */
ascb_addr = ARCH_DEP(vfetch4) ( effective_addr1, acc_mode, regs );
/* Load locks held bits from second operand location */
hlhi_word = ARCH_DEP(vfetch4) ( effective_addr2, acc_mode, regs );
/* Fetch our logical CPU address from PSALCPUA */
lcpa = ARCH_DEP(vfetch4) ( effective_addr2 - 4, acc_mode, regs );
lock_addr = (ascb_addr + ASCBLOCK) & ADDRESS_MAXWRAP(regs);
/* Fetch the local lock from the ASCB */
lock = ARCH_DEP(vfetch4) ( lock_addr, acc_mode, regs );
/* Obtain the local lock if not already held by any CPU */
if (lock == 0
&& (hlhi_word & PSALCLLI) == 0)
{
/* Store the unchanged value into the second operand to
ensure suppression in the event of an access exception */
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Store our logical CPU address in ASCBLOCK */
ARCH_DEP(vstore4) ( lcpa, lock_addr, acc_mode, regs );
/* Set the local lock held bit in the second operand */
hlhi_word |= PSALCLLI;
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Set register 13 to zero to indicate lock obtained */
regs->GR_L(13) = 0;
}
else
{
/* Fetch the lock interface table address from the
second word of the second operand, and load the
new instruction address and amode from LITOLOC */
lit_addr = ARCH_DEP(vfetch4) ( effective_addr2 + 4, acc_mode, regs ) + LITOLOC;
lit_addr &= ADDRESS_MAXWRAP(regs);
newia = ARCH_DEP(vfetch4) ( lit_addr, acc_mode, regs );
/* Save the link information in register 12 */
regs->GR_L(12) = regs->psw.IA & ADDRESS_MAXWRAP(regs);
/* Copy LITOLOC into register 13 to signify obtain failure */
regs->GR_L(13) = newia;
/* Update the PSW instruction address */
regs->psw.IA = newia & ADDRESS_MAXWRAP(regs);
VALIDATE_AIA(regs);
}
/* Release main-storage access lock */
RELEASE_MAINLOCK(regs);
PERFORM_SERIALIZATION(regs);
} /* end function obtain_local_lock */
/*-------------------------------------------------------------------*/
/* E505 - Release Local Lock [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(release_local_lock)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
VADR ascb_addr; /* Virtual address of ASCB */
VADR lock_addr; /* Virtual addr of ASCBLOCK */
VADR susp_addr; /* Virtual addr of ASCBLSWQ */
U32 hlhi_word; /* Highest lock held word */
VADR lit_addr; /* Virtual address of lock
interface table */
U32 lock; /* Lock value */
U32 susp; /* Lock suspend queue */
U32 lcpa; /* Logical CPU address */
VADR newia; /* Unsuccessful branch addr */
int acc_mode = 0; /* access mode to use */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/* Obtain main-storage access lock */
OBTAIN_MAINLOCK(regs);
if (ACCESS_REGISTER_MODE(®s->psw))
acc_mode = USE_PRIMARY_SPACE;
/* Load ASCB address from first operand location */
ascb_addr = ARCH_DEP(vfetch4) ( effective_addr1, acc_mode, regs );
/* Load locks held bits from second operand location */
hlhi_word = ARCH_DEP(vfetch4) ( effective_addr2, acc_mode, regs );
/* Fetch our logical CPU address from PSALCPUA */
lcpa = ARCH_DEP(vfetch4) ( effective_addr2 - 4, acc_mode, regs );
/* Fetch the local lock and the suspend queue from the ASCB */
lock_addr = (ascb_addr + ASCBLOCK) & ADDRESS_MAXWRAP(regs);
susp_addr = (ascb_addr + ASCBLSWQ) & ADDRESS_MAXWRAP(regs);
lock = ARCH_DEP(vfetch4) ( lock_addr, acc_mode, regs );
susp = ARCH_DEP(vfetch4) ( susp_addr, acc_mode, regs );
/* Test if this CPU holds the local lock, and does not hold
any CMS lock, and the local lock suspend queue is empty */
if (lock == lcpa
&& (hlhi_word & (PSALCLLI | PSACMSLI)) == PSALCLLI
&& susp == 0)
{
/* Store the unchanged value into the second operand to
ensure suppression in the event of an access exception */
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Set the local lock to zero */
ARCH_DEP(vstore4) ( 0, lock_addr, acc_mode, regs );
/* Clear the local lock held bit in the second operand */
hlhi_word &= ~PSALCLLI;
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Set register 13 to zero to indicate lock released */
regs->GR_L(13) = 0;
}
else
{
/* Fetch the lock interface table address from the
second word of the second operand, and load the
new instruction address and amode from LITRLOC */
lit_addr = ARCH_DEP(vfetch4) ( effective_addr2 + 4, acc_mode, regs ) + LITRLOC;
lit_addr &= ADDRESS_MAXWRAP(regs);
newia = ARCH_DEP(vfetch4) ( lit_addr, acc_mode, regs );
/* Save the link information in register 12 */
regs->GR_L(12) = regs->psw.IA & ADDRESS_MAXWRAP(regs);
/* Copy LITRLOC into register 13 to signify release failure */
regs->GR_L(13) = newia;
/* Update the PSW instruction address */
regs->psw.IA = newia & ADDRESS_MAXWRAP(regs);
VALIDATE_AIA(regs);
}
/* Release main-storage access lock */
RELEASE_MAINLOCK(regs);
} /* end function release_local_lock */
/*-------------------------------------------------------------------*/
/* E506 - Obtain CMS Lock [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(obtain_cms_lock)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
VADR ascb_addr; /* Virtual address of ASCB */
U32 hlhi_word; /* Highest lock held word */
VADR lit_addr; /* Virtual address of lock
interface table */
VADR lock_addr; /* Lock address */
int lock_arn; /* Lock access register */
U32 lock; /* Lock value */
VADR newia; /* Unsuccessful branch addr */
int acc_mode = 0; /* access mode to use */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
PERFORM_SERIALIZATION(regs);
/* General register 11 contains the lock address */
lock_addr = regs->GR_L(11) & ADDRESS_MAXWRAP(regs);
lock_arn = 11;
/* Obtain main-storage access lock */
OBTAIN_MAINLOCK(regs);
if (ACCESS_REGISTER_MODE(®s->psw))
acc_mode = USE_PRIMARY_SPACE;
/* Load ASCB address from first operand location */
ascb_addr = ARCH_DEP(vfetch4) ( effective_addr1, acc_mode, regs );
/* Load locks held bits from second operand location */
hlhi_word = ARCH_DEP(vfetch4) ( effective_addr2, acc_mode, regs );
/* Fetch the lock addressed by general register 11 */
lock = ARCH_DEP(vfetch4) ( lock_addr, acc_mode, regs );
/* Obtain the lock if not held by any ASCB, and if this CPU
holds the local lock and does not hold a CMS lock */
if (lock == 0
&& (hlhi_word & (PSALCLLI | PSACMSLI)) == PSALCLLI)
{
/* Store the unchanged value into the second operand to
ensure suppression in the event of an access exception */
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Store the ASCB address in the CMS lock */
ARCH_DEP(vstore4) ( ascb_addr, lock_addr, acc_mode, regs );
/* Set the CMS lock held bit in the second operand */
hlhi_word |= PSACMSLI;
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Set register 13 to zero to indicate lock obtained */
regs->GR_L(13) = 0;
}
else
{
/* Fetch the lock interface table address from the
second word of the second operand, and load the
new instruction address and amode from LITOCMS */
lit_addr = ARCH_DEP(vfetch4) ( effective_addr2 + 4, acc_mode, regs ) + LITOCMS;
lit_addr &= ADDRESS_MAXWRAP(regs);
newia = ARCH_DEP(vfetch4) ( lit_addr, acc_mode, regs );
/* Save the link information in register 12 */
regs->GR_L(12) = regs->psw.IA & ADDRESS_MAXWRAP(regs);
/* Copy LITOCMS into register 13 to signify obtain failure */
regs->GR_L(13) = newia;
/* Update the PSW instruction address */
regs->psw.IA = newia & ADDRESS_MAXWRAP(regs);
VALIDATE_AIA(regs);
}
/* Release main-storage access lock */
RELEASE_MAINLOCK(regs);
PERFORM_SERIALIZATION(regs);
} /* end function obtain_cms_lock */
/*-------------------------------------------------------------------*/
/* E507 - Release CMS Lock [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(release_cms_lock)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
VADR ascb_addr; /* Virtual address of ASCB */
U32 hlhi_word; /* Highest lock held word */
VADR lit_addr; /* Virtual address of lock
interface table */
VADR lock_addr; /* Lock address */
int lock_arn; /* Lock access register */
U32 lock; /* Lock value */
U32 susp; /* Lock suspend queue */
VADR newia; /* Unsuccessful branch addr */
int acc_mode = 0; /* access mode to use */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/* General register 11 contains the lock address */
lock_addr = regs->GR_L(11) & ADDRESS_MAXWRAP(regs);
lock_arn = 11;
/* Obtain main-storage access lock */
OBTAIN_MAINLOCK(regs);
if (ACCESS_REGISTER_MODE(®s->psw))
acc_mode = USE_PRIMARY_SPACE;
/* Load ASCB address from first operand location */
ascb_addr = ARCH_DEP(vfetch4) ( effective_addr1, acc_mode, regs );
/* Load locks held bits from second operand location */
hlhi_word = ARCH_DEP(vfetch4) ( effective_addr2, acc_mode, regs );
/* Fetch the CMS lock and the suspend queue word */
lock = ARCH_DEP(vfetch4) ( lock_addr, acc_mode, regs );
susp = ARCH_DEP(vfetch4) ( lock_addr + 4, acc_mode, regs );
/* Test if current ASCB holds this lock, the locks held indicators
show a CMS lock is held, and the lock suspend queue is empty */
if (lock == ascb_addr
&& (hlhi_word & PSACMSLI)
&& susp == 0)
{
/* Store the unchanged value into the second operand to
ensure suppression in the event of an access exception */
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Set the CMS lock to zero */
ARCH_DEP(vstore4) ( 0, lock_addr, acc_mode, regs );
/* Clear the CMS lock held bit in the second operand */
hlhi_word &= ~PSACMSLI;
ARCH_DEP(vstore4) ( hlhi_word, effective_addr2, acc_mode, regs );
/* Set register 13 to zero to indicate lock released */
regs->GR_L(13) = 0;
}
else
{
/* Fetch the lock interface table address from the
second word of the second operand, and load the
new instruction address and amode from LITRCMS */
lit_addr = ARCH_DEP(vfetch4) ( effective_addr2 + 4, acc_mode, regs ) + LITRCMS;
lit_addr &= ADDRESS_MAXWRAP(regs);
newia = ARCH_DEP(vfetch4) ( lit_addr, acc_mode, regs );
/* Save the link information in register 12 */
regs->GR_L(12) = regs->psw.IA & ADDRESS_MAXWRAP(regs);
/* Copy LITRCMS into register 13 to signify release failure */
regs->GR_L(13) = newia;
/* Update the PSW instruction address */
regs->psw.IA = newia & ADDRESS_MAXWRAP(regs);
VALIDATE_AIA(regs);
}
/* Release main-storage access lock */
RELEASE_MAINLOCK(regs);
} /* end function release_cms_lock */
#if !defined(FEATURE_TRACING)
/*-------------------------------------------------------------------*/
/* E508 - Trace SVC Interruption [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(trace_svc_interruption)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/*INCOMPLETE: NO TRACE ENTRY IS GENERATED*/
}
/*-------------------------------------------------------------------*/
/* E509 - Trace Program Interruption [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(trace_program_interruption)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/*INCOMPLETE: NO TRACE ENTRY IS GENERATED*/
}
/*-------------------------------------------------------------------*/
/* E50A - Trace Initial SRB Dispatch [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(trace_initial_srb_dispatch)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/*INCOMPLETE: NO TRACE ENTRY IS GENERATED*/
}
/*-------------------------------------------------------------------*/
/* E50B - Trace I/O Interruption [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(trace_io_interruption)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/*INCOMPLETE: NO TRACE ENTRY IS GENERATED*/
}
/*-------------------------------------------------------------------*/
/* E50C - Trace Task Dispatch [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(trace_task_dispatch)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/*INCOMPLETE: NO TRACE ENTRY IS GENERATED*/
}
/*-------------------------------------------------------------------*/
/* E50D - Trace SVC Return [SSE] */
/*-------------------------------------------------------------------*/
DEF_INST(trace_svc_return)
{
int b1, b2; /* Values of base field */
VADR effective_addr1,
effective_addr2; /* Effective addresses */
SSE(inst, regs, b1, effective_addr1, b2, effective_addr2);
PRIV_CHECK(regs);
/* Specification exception if operands are not on word boundary */
if ((effective_addr1 & 0x00000003) || (effective_addr2 & 0x00000003))
ARCH_DEP(program_interrupt) (regs, PGM_SPECIFICATION_EXCEPTION);
/*INCOMPLETE: NO TRACE ENTRY IS GENERATED*/
}
#endif /*!defined(FEATURE_TRACING)*/
#if !defined(_GEN_ARCH)
#if defined(_ARCHMODE2)
#define _GEN_ARCH _ARCHMODE2
#include "assist.c"
#endif
#if defined(_ARCHMODE3)
#undef _GEN_ARCH
#define _GEN_ARCH _ARCHMODE3
#include "assist.c"
#endif
#endif /*!defined(_GEN_ARCH)*/
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