mfctl %cr25,\reg
.endm
- /* Only allow faults on different spaces from the
- * currently active one if we're the kernel */
+ /*
+ space_check(spc,tmp,fault)
+
+ spc - The space we saw the fault with.
+ tmp - The place to store the current space.
+ fault - Function to call on failure.
+
+ Only allow faults on different spaces from the
+ currently active one if we're the kernel
+
+ */
.macro space_check spc,tmp,fault
mfsp %sr7,\tmp
or,COND(<>) %r0,\spc,%r0 /* user may execute gateway page
#ifdef __LP64__
ldo -16(%r30),%r29 /* Reference param save area */
#endif
- bl do_fork, %r2
+ BL do_fork, %r2
copy %r1, %r24 /* pt_regs */
/* Parent Returns here */
#ifdef __LP64__
ldo -16(%r30),%r29 /* Reference param save area */
#endif
- bl sys_execve, %r2
+ BL sys_execve, %r2
copy %r16, %r26
cmpib,=,n 0,%r28,intr_return /* forward */
STREG %r19,PT_SR7(%r16)
intr_return:
+ /* NOTE: Need to enable interrupts incase we schedule. */
ssm PSW_SM_I, %r0
/* Check for software interrupts */
ldo PT_FR31(%r29),%r1
rest_fp %r1
rest_general %r29
+
+ /* Create a "relied upon translation" PA 2.0 Arch. F-5 */
ssm 0,%r0
nop
nop
nop
tophys_r1 %r29
rsm (PSW_SM_Q|PSW_SM_P|PSW_SM_D|PSW_SM_I),%r0
+
+ /* Restore space id's and special cr's from PT_REGS
+ * structure pointed to by r29 */
rest_specials %r29
+
+ /* Important: Note that rest_stack restores r29
+ * last (we are using it)! It also restores r1 and r30. */
rest_stack
+
rfi
nop
nop
.import do_signal,code
intr_do_signal:
- /* Only do signals if we are returning to user space */
+ /*
+ This check is critical to having LWS
+ working. The IASQ is zero on the gateway
+ page and we cannot deliver any signals until
+ we get off the gateway page.
+
+ Only do signals if we are returning to user space
+ */
LDREG PT_IASQ0(%r16), %r20
CMPIB= 0,%r20,intr_restore /* backward */
nop
ldo -16(%r30),%r29 /* Reference param save area */
#endif
- bl do_signal,%r2
+ BL do_signal,%r2
copy %r0, %r26 /* sigset_t *oldset = NULL */
b intr_restore
* of the instruction. Since we don't insert a translation
* we can get a lot of faults during a flush loop, so it makes
* sense to try to do it here with minimum overhead. We only
- * emulate fdc,fic & pdc instructions whose base and index
- * registers are not shadowed. We defer everything else to the
- * "slow" path.
+ * emulate fdc,fic,pdc,probew,prober instructions whose base
+ * and index registers are not shadowed. We defer everything
+ * else to the "slow" path.
*/
mfctl %cr19,%r9 /* Get iir */
+
+ /* PA 2.0 Arch Ref. Book pg 382 has a good description of the insn bits.
+ Checks for fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw */
+
+ /* Checks for fdc,fdce,pdc,"fic,4f" only */
ldi 0x280,%r16
and %r9,%r16,%r17
- cmpb,<>,n %r16,%r17,nadtlb_fault /* Not fdc,fic,pdc */
+ cmpb,<>,n %r16,%r17,nadtlb_probe_check
bb,>=,n %r9,26,nadtlb_nullify /* m bit not set, just nullify */
BL get_register,%r25
extrw,u %r9,15,5,%r8 /* Get index register # */
rfir
nop
+ /*
+ When there is no translation for the probe address then we
+ must nullify the insn and return zero in the target regsiter.
+ This will indicate to the calling code that it does not have
+ write/read privileges to this address.
+
+ This should technically work for prober and probew in PA 1.1,
+ and also probe,r and probe,w in PA 2.0
+
+ WARNING: USE ONLY NON-SHADOW REGISTERS WITH PROBE INSN!
+ THE SLOW-PATH EMULATION HAS NOT BEEN WRITTEN YET.
+
+ */
+nadtlb_probe_check:
+ ldi 0x80,%r16
+ and %r9,%r16,%r17
+ cmpb,<>,n %r16,%r17,nadtlb_fault /* Must be probe,[rw]*/
+ BL get_register,%r25 /* Find the target register */
+ extrw,u %r9,31,5,%r8 /* Get target register */
+ CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
+ BL set_register,%r25
+ copy %r0,%r1 /* Write zero to target register */
+ b nadtlb_nullify /* Nullify return insn */
+ nop
+
+
#ifdef __LP64__
itlb_miss_20w:
LDREG PT_GR30(%r1),%r25
copy %r1,%r24
- bl sys_clone,%r2
+ BL sys_clone,%r2
ldi SIGCHLD,%r26
LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
/* Set the return value for the child */
child_return:
- bl schedule_tail, %r2
+ BL schedule_tail, %r2
nop
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1
STREG %r2,PT_GR19(%r1) /* save for child */
STREG %r30,PT_GR21(%r1)
- bl sys_clone,%r2
+ BL sys_clone,%r2
copy %r1,%r24
b wrapper_exit
STREG %r2,PT_GR19(%r1) /* save for child */
STREG %r30,PT_GR21(%r1)
- bl sys_vfork,%r2
+ BL sys_vfork,%r2
copy %r1,%r26
b wrapper_exit
STREG %r2, -RP_OFFSET(%r30)
#ifdef __LP64__
ldo FRAME_SIZE(%r30), %r30
- bl sys_rt_sigreturn,%r2
+ BL sys_rt_sigreturn,%r2
ldo -16(%r30),%r29 /* Reference param save area */
#else
- bl sys_rt_sigreturn,%r2
+ BL sys_rt_sigreturn,%r2
ldo FRAME_SIZE(%r30), %r30
#endif
STREG %r2, -RP_OFFSET(%r30)
#ifdef __LP64__
ldo FRAME_SIZE(%r30), %r30
- bl do_sigaltstack,%r2
+ b,l do_sigaltstack,%r2
ldo -16(%r30),%r29 /* Reference param save area */
#else
bl do_sigaltstack,%r2
LDREG TASK_PT_GR30(%r24),%r24
STREG %r2, -RP_OFFSET(%r30)
ldo FRAME_SIZE(%r30), %r30
- bl do_sigaltstack32,%r2
+ b,l do_sigaltstack32,%r2
ldo -16(%r30),%r29 /* Reference param save area */
ldo -FRAME_SIZE(%r30), %r30
STREG %r2, -RP_OFFSET(%r30)
#ifdef __LP64__
ldo FRAME_SIZE(%r30), %r30
- bl sys_rt_sigsuspend,%r2
+ b,l sys_rt_sigsuspend,%r2
ldo -16(%r30),%r29 /* Reference param save area */
#else
bl sys_rt_sigsuspend,%r2
.export syscall_exit
syscall_exit:
+
/* NOTE: HP-UX syscalls also come through here
- after hpux_syscall_exit fixes up return
- values. */
+ * after hpux_syscall_exit fixes up return
+ * values. */
+
/* NOTE: Not all syscalls exit this way. rt_sigreturn will exit
* via syscall_exit_rfi if the signal was received while the process
* was running.
LDREG TASK_PT_GR29(%r1),%r29
LDREG TASK_PT_GR31(%r1),%r31 /* restore syscall rp */
+ /* NOTE: We use rsm/ssm pair to make this operation atomic */
rsm PSW_SM_I, %r0
LDREG TASK_PT_GR30(%r1),%r30 /* restore user sp */
mfsp %sr3,%r1 /* Get users space id */
mtsp %r1,%sr7 /* Restore sr7 */
ssm PSW_SM_I, %r0
+
+ /* Set sr2 to zero for userspace syscalls to work. */
+ mtsp %r0,%sr2
mtsp %r1,%sr4 /* Restore sr4 */
mtsp %r1,%sr5 /* Restore sr5 */
mtsp %r1,%sr6 /* Restore sr6 */
bb,< %r2,30,pt_regs_ok /* Branch if D set */
ldo TASK_REGS(%r1),%r25
reg_save %r25 /* Save r3 to r18 */
+
+ /* Save the current sr */
mfsp %sr0,%r2
STREG %r2,TASK_PT_SR0(%r1)
+
+ /* Save the scratch sr */
mfsp %sr1,%r2
STREG %r2,TASK_PT_SR1(%r1)
- mfsp %sr2,%r2
- STREG %r2,TASK_PT_SR2(%r1)
+
+ /* sr2 should be set to zero for userspace syscalls */
+ STREG %r0,TASK_PT_SR2(%r1)
+
pt_regs_ok:
LDREG TASK_PT_GR31(%r1),%r2
depi 3,31,2,%r2 /* ensure return to user mode. */
syscall_do_softirq:
bl do_softirq,%r2
nop
+ /* NOTE: We enable I-bit incase we schedule later,
+ * and we might be going back to userspace if we were
+ * traced. */
b syscall_check_resched
ssm PSW_SM_I, %r0 /* do_softirq returns with I bit off */
.import schedule,code
syscall_do_resched:
- bl schedule,%r2
+ BL schedule,%r2
#ifdef __LP64__
ldo -16(%r30),%r29 /* Reference param save area */
#else
#ifdef __LP64__
ldo -16(%r30),%r29 /* Reference param save area */
#endif
- bl do_signal,%r2
+ BL do_signal,%r2
copy %r0, %r26 /* sigset_t *oldset = NULL */
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
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