Removed hack that did the R_SHIFT of unsigned numbers, no longer need
to do this as I have changed to using PDTI's as the bases for the vm system layout. Eliminate constants SYSPDROFF and SYSPDREND, now use NKPTE to control the size of the kernel virtual space. Eliminate constant PDRPDROFF, now use PDTDTPI to control location of PTD, PTDmap and PTDpde Eliminate constant APDRPDROFF, now use APTDPTDI to control location of APTD, APTDmap and APTDpde. Still need to fix Sysmap location (it is still a constant). .globl statements are now consistent with respect to <comma><space>, the <space> being removed from all .globl statements. Document the fillkpt macro as to what registers control what. Fix some comments that went past column 80, and clean/line some others up. Remove constand for _Crtat, now use KERNBASE+constant, this still needs work. Replace constants for offsets of sigcode parameters with symbolic names from assym.s Mark the sigreturn() call with XXX since we use the hardcoded constant for the system call number, this is bogus and should be a #define or something some place! The kernel before and after this change was verified with cmp, not one byte changed. These are all cosmetic clean up changes that makes the code more correct and easier to move the kernels virtual address space and size.
This commit is contained in:
Rodney W. Grimes
parent
911d8c1f44
commit
e5ff3be604
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=592
@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
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* $Id: locore.s,v 1.5 1993/10/08 20:45:09 rgrimes Exp $
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* $Id: locore.s,v 1.6 1993/10/10 06:07:57 rgrimes Exp $
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*/
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@ -69,19 +69,6 @@
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*/
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.set IDXSHIFT,10
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/*
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* note: gas copys sign bit (e.g. arithmetic >>), can't do KERNBASE>>PDRSHIFT!
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*
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* Okay, gas is broken, here is a gross way around it, a macro that
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* effectively does a logical shift by first doing a 1 bit arithmetic
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* shift, then zero out the sign bit, then finish the shift.
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*/
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#define R_SHIFT(val,count) ((((val) >> 1) & (~(1<<31))) >> (count - 1))
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/* Page dir index of System Base */
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.set SYSPDROFF,R_SHIFT(KERNBASE,PDRSHIFT)
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/* Page dir index of System End */
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.set SYSPDREND,R_SHIFT(KERNBASE+KERNSIZE,PDRSHIFT)
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#define ALIGN_DATA .align 2
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#define ALIGN_TEXT .align 2,0x90 /* 4-byte boundaries, NOP-filled */
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@ -131,22 +118,21 @@
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* PTmap is recursive pagemap at top of virtual address space.
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* Within PTmap, the page directory can be found (third indirection).
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*/
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.set PDRPDROFF,0x3F7 /* Page dir index of Page dir */
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.globl _PTmap, _PTD, _PTDpde, _Sysmap
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.set _PTmap,0xFDC00000
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.set _PTD,0xFDFF7000
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.globl _PTmap,_PTD,_PTDpde,_Sysmap
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.set _PTmap,PTDPTDI << PDRSHIFT
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.set _PTD,_PTmap + (PTDPTDI * NBPG)
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.set _PTDpde,_PTD + (PTDPTDI * 4) /* XXX 4=sizeof pte */
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.set _Sysmap,0xFDFF8000
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.set _PTDpde,0xFDFF7000+4*PDRPDROFF
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/*
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* APTmap, APTD is the alternate recursive pagemap.
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* It's used when modifying another process's page tables.
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*/
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.set APDRPDROFF,0x3FE /* Page dir index of Page dir */
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.globl _APTmap, _APTD, _APTDpde
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.set _APTmap,0xFF800000
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.set _APTD,0xFFBFE000
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.set _APTDpde,0xFDFF7000+4*APDRPDROFF
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.globl _APTmap,_APTD,_APTDpde
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.set _APTmap,APTDPTDI << PDRSHIFT
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.set _APTD,_APTmap + (APTDPTDI * NBPG)
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.set _APTDpde,_PTD + (APTDPTDI * 4) /* XXX 4=sizeof pte */
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/*
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* Access to each processes kernel stack is via a region of
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@ -166,19 +152,19 @@
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.globl _esym
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_esym: .long 0 /* ptr to end of syms */
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.globl _boothowto, _bootdev, _curpcb
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.globl _boothowto,_bootdev,_curpcb
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.globl _cpu, _cold, _atdevbase
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.globl _cpu,_cold,_atdevbase
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_cpu: .long 0 /* are we 386, 386sx, or 486 */
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_cold: .long 1 /* cold till we are not */
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_atdevbase: .long 0 /* location of start of iomem in virtual */
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_atdevphys: .long 0 /* location of device mapping ptes (phys) */
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.globl _IdlePTD, _KPTphys
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.globl _IdlePTD,_KPTphys
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_IdlePTD: .long 0
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_KPTphys: .long 0
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.globl _cyloffset, _proc0paddr
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.globl _cyloffset,_proc0paddr
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_cyloffset: .long 0
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_proc0paddr: .long 0
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@ -311,6 +297,12 @@ ENTRY(btext)
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/* physical address of Idle Address space */
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movl %esi,_IdlePTD-KERNBASE
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/*
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* fillkpt
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* eax = (page frame address | control | status) == pte
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* ebx = address of page table
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* ecx = how many pages to map
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*/
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#define fillkpt \
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1: movl %eax,(%ebx) ; \
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addl $NBPG,%eax ; /* increment physical address */ \
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@ -348,7 +340,8 @@ ENTRY(btext)
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movl $UPAGES,%ecx /* for this many pte s, */
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lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */
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lea (KERNBASE)(%eax),%edx
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movl %edx,_proc0paddr-KERNBASE /* remember VA for 0th process init */
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movl %edx,_proc0paddr-KERNBASE
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/* remember VA for 0th process init */
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orl $PG_V|PG_KW,%eax /* having these bits set, */
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lea (3*NBPG)(%esi),%ebx /* physical address of stack pt in proc 0 */
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addl $(PPTEOFF*4),%ebx
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@ -364,14 +357,14 @@ ENTRY(btext)
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movl %eax,(%esi) /* which is where temp maps! */
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/* kernel pde's */
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movl $(SYSPDREND-SYSPDROFF),%ecx /* for this many pde s, */
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lea (SYSPDROFF*4)(%esi),%ebx /* offset of pde for kernel */
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movl $(NKPDE),%ecx /* for this many pde s, */
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lea (KPTDI*4)(%esi),%ebx /* offset of pde for kernel */
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fillkpt
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/* install a pde recursively mapping page directory as a page table! */
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movl %esi,%eax /* phys address of ptd in proc 0 */
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orl $PG_V|PG_UW,%eax /* pde entry is valid XXX 06 Aug 92 */
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movl %eax,PDRPDROFF*4(%esi) /* which is where PTmap maps! */
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movl %eax,PTDPTDI*4(%esi) /* which is where PTmap maps! */
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/* install a pde to map kernel stack for proc 0 */
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lea (3*NBPG)(%esi),%eax /* physical address of pt in proc 0 */
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@ -422,7 +415,7 @@ ENTRY(btext)
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addl $2*6,%esp
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popal
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/* load base of page directory, and enable mapping */
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/* load base of page directory and enable mapping */
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movl %esi,%eax /* phys address of ptd in proc 0 */
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orl $I386_CR3PAT,%eax
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movl %eax,%cr3 /* load ptd addr into mmu */
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@ -445,9 +438,9 @@ ENTRY(btext)
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begin: /* now running relocated at KERNBASE where the system is linked to run */
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.globl _Crtat /* XXX - locore should not know about */
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movl _Crtat,%eax /* variables of device drivers (pccons)! */
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subl $0xfe0a0000,%eax
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.globl _Crtat /* XXX - locore should not know about */
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movl _Crtat,%eax /* variables of device drivers (pccons)! */
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subl $(KERNBASE+0xA0000),%eax
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movl _atdevphys,%edx /* get pte PA */
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subl _KPTphys,%edx /* remove base of ptes, now have phys offset */
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shll $PGSHIFT-2,%edx /* corresponding to virt offset */
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@ -561,13 +554,12 @@ _szicode:
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.long _szicode-_icode
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NON_GPROF_ENTRY(sigcode)
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call 12(%esp)
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lea 28(%esp),%eax /* scp (the call may have clobbered the */
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/* copy at 8(%esp)) */
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/* XXX - use genassym */
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call SIGF_HANDLER(%esp)
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lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
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/* copy at 8(%esp)) */
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pushl %eax
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pushl %eax /* junk to fake return address */
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movl $103,%eax /* sigreturn() */
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movl $103,%eax /* XXX sigreturn() */
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LCALL(0x7,0) /* enter kernel with args on stack */
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hlt /* never gets here */
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
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* $Id: locore.s,v 1.5 1993/10/08 20:45:09 rgrimes Exp $
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* $Id: locore.s,v 1.6 1993/10/10 06:07:57 rgrimes Exp $
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*/
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@ -69,19 +69,6 @@
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*/
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.set IDXSHIFT,10
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/*
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* note: gas copys sign bit (e.g. arithmetic >>), can't do KERNBASE>>PDRSHIFT!
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*
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* Okay, gas is broken, here is a gross way around it, a macro that
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* effectively does a logical shift by first doing a 1 bit arithmetic
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* shift, then zero out the sign bit, then finish the shift.
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*/
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#define R_SHIFT(val,count) ((((val) >> 1) & (~(1<<31))) >> (count - 1))
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/* Page dir index of System Base */
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.set SYSPDROFF,R_SHIFT(KERNBASE,PDRSHIFT)
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/* Page dir index of System End */
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.set SYSPDREND,R_SHIFT(KERNBASE+KERNSIZE,PDRSHIFT)
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#define ALIGN_DATA .align 2
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#define ALIGN_TEXT .align 2,0x90 /* 4-byte boundaries, NOP-filled */
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@ -131,22 +118,21 @@
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* PTmap is recursive pagemap at top of virtual address space.
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* Within PTmap, the page directory can be found (third indirection).
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*/
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.set PDRPDROFF,0x3F7 /* Page dir index of Page dir */
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.globl _PTmap, _PTD, _PTDpde, _Sysmap
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.set _PTmap,0xFDC00000
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.set _PTD,0xFDFF7000
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.globl _PTmap,_PTD,_PTDpde,_Sysmap
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.set _PTmap,PTDPTDI << PDRSHIFT
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.set _PTD,_PTmap + (PTDPTDI * NBPG)
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.set _PTDpde,_PTD + (PTDPTDI * 4) /* XXX 4=sizeof pte */
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.set _Sysmap,0xFDFF8000
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.set _PTDpde,0xFDFF7000+4*PDRPDROFF
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/*
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* APTmap, APTD is the alternate recursive pagemap.
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* It's used when modifying another process's page tables.
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*/
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.set APDRPDROFF,0x3FE /* Page dir index of Page dir */
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.globl _APTmap, _APTD, _APTDpde
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.set _APTmap,0xFF800000
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.set _APTD,0xFFBFE000
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.set _APTDpde,0xFDFF7000+4*APDRPDROFF
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.globl _APTmap,_APTD,_APTDpde
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.set _APTmap,APTDPTDI << PDRSHIFT
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.set _APTD,_APTmap + (APTDPTDI * NBPG)
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.set _APTDpde,_PTD + (APTDPTDI * 4) /* XXX 4=sizeof pte */
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/*
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* Access to each processes kernel stack is via a region of
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@ -166,19 +152,19 @@
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.globl _esym
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_esym: .long 0 /* ptr to end of syms */
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.globl _boothowto, _bootdev, _curpcb
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.globl _boothowto,_bootdev,_curpcb
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.globl _cpu, _cold, _atdevbase
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.globl _cpu,_cold,_atdevbase
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_cpu: .long 0 /* are we 386, 386sx, or 486 */
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_cold: .long 1 /* cold till we are not */
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_atdevbase: .long 0 /* location of start of iomem in virtual */
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_atdevphys: .long 0 /* location of device mapping ptes (phys) */
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.globl _IdlePTD, _KPTphys
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.globl _IdlePTD,_KPTphys
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_IdlePTD: .long 0
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_KPTphys: .long 0
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.globl _cyloffset, _proc0paddr
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.globl _cyloffset,_proc0paddr
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_cyloffset: .long 0
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_proc0paddr: .long 0
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@ -311,6 +297,12 @@ ENTRY(btext)
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/* physical address of Idle Address space */
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movl %esi,_IdlePTD-KERNBASE
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/*
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* fillkpt
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* eax = (page frame address | control | status) == pte
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* ebx = address of page table
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* ecx = how many pages to map
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*/
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#define fillkpt \
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1: movl %eax,(%ebx) ; \
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addl $NBPG,%eax ; /* increment physical address */ \
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@ -348,7 +340,8 @@ ENTRY(btext)
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movl $UPAGES,%ecx /* for this many pte s, */
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lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */
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lea (KERNBASE)(%eax),%edx
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movl %edx,_proc0paddr-KERNBASE /* remember VA for 0th process init */
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movl %edx,_proc0paddr-KERNBASE
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/* remember VA for 0th process init */
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orl $PG_V|PG_KW,%eax /* having these bits set, */
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lea (3*NBPG)(%esi),%ebx /* physical address of stack pt in proc 0 */
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addl $(PPTEOFF*4),%ebx
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@ -364,14 +357,14 @@ ENTRY(btext)
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movl %eax,(%esi) /* which is where temp maps! */
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/* kernel pde's */
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movl $(SYSPDREND-SYSPDROFF),%ecx /* for this many pde s, */
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lea (SYSPDROFF*4)(%esi),%ebx /* offset of pde for kernel */
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movl $(NKPDE),%ecx /* for this many pde s, */
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lea (KPTDI*4)(%esi),%ebx /* offset of pde for kernel */
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fillkpt
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/* install a pde recursively mapping page directory as a page table! */
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movl %esi,%eax /* phys address of ptd in proc 0 */
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orl $PG_V|PG_UW,%eax /* pde entry is valid XXX 06 Aug 92 */
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movl %eax,PDRPDROFF*4(%esi) /* which is where PTmap maps! */
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movl %eax,PTDPTDI*4(%esi) /* which is where PTmap maps! */
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/* install a pde to map kernel stack for proc 0 */
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lea (3*NBPG)(%esi),%eax /* physical address of pt in proc 0 */
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@ -422,7 +415,7 @@ ENTRY(btext)
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addl $2*6,%esp
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popal
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/* load base of page directory, and enable mapping */
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/* load base of page directory and enable mapping */
|
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movl %esi,%eax /* phys address of ptd in proc 0 */
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orl $I386_CR3PAT,%eax
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movl %eax,%cr3 /* load ptd addr into mmu */
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@ -445,9 +438,9 @@ ENTRY(btext)
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begin: /* now running relocated at KERNBASE where the system is linked to run */
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.globl _Crtat /* XXX - locore should not know about */
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movl _Crtat,%eax /* variables of device drivers (pccons)! */
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subl $0xfe0a0000,%eax
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.globl _Crtat /* XXX - locore should not know about */
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movl _Crtat,%eax /* variables of device drivers (pccons)! */
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subl $(KERNBASE+0xA0000),%eax
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movl _atdevphys,%edx /* get pte PA */
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subl _KPTphys,%edx /* remove base of ptes, now have phys offset */
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shll $PGSHIFT-2,%edx /* corresponding to virt offset */
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@ -561,13 +554,12 @@ _szicode:
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.long _szicode-_icode
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|
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NON_GPROF_ENTRY(sigcode)
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call 12(%esp)
|
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lea 28(%esp),%eax /* scp (the call may have clobbered the */
|
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/* copy at 8(%esp)) */
|
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/* XXX - use genassym */
|
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call SIGF_HANDLER(%esp)
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lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
|
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/* copy at 8(%esp)) */
|
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pushl %eax
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pushl %eax /* junk to fake return address */
|
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movl $103,%eax /* sigreturn() */
|
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movl $103,%eax /* XXX sigreturn() */
|
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LCALL(0x7,0) /* enter kernel with args on stack */
|
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hlt /* never gets here */
|
||||
|
||||
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
|
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*
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* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
|
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* $Id: locore.s,v 1.5 1993/10/08 20:45:09 rgrimes Exp $
|
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* $Id: locore.s,v 1.6 1993/10/10 06:07:57 rgrimes Exp $
|
||||
*/
|
||||
|
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@ -69,19 +69,6 @@
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*/
|
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|
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.set IDXSHIFT,10
|
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/*
|
||||
* note: gas copys sign bit (e.g. arithmetic >>), can't do KERNBASE>>PDRSHIFT!
|
||||
*
|
||||
* Okay, gas is broken, here is a gross way around it, a macro that
|
||||
* effectively does a logical shift by first doing a 1 bit arithmetic
|
||||
* shift, then zero out the sign bit, then finish the shift.
|
||||
*/
|
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#define R_SHIFT(val,count) ((((val) >> 1) & (~(1<<31))) >> (count - 1))
|
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|
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/* Page dir index of System Base */
|
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.set SYSPDROFF,R_SHIFT(KERNBASE,PDRSHIFT)
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/* Page dir index of System End */
|
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.set SYSPDREND,R_SHIFT(KERNBASE+KERNSIZE,PDRSHIFT)
|
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|
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#define ALIGN_DATA .align 2
|
||||
#define ALIGN_TEXT .align 2,0x90 /* 4-byte boundaries, NOP-filled */
|
||||
@ -131,22 +118,21 @@
|
||||
* PTmap is recursive pagemap at top of virtual address space.
|
||||
* Within PTmap, the page directory can be found (third indirection).
|
||||
*/
|
||||
.set PDRPDROFF,0x3F7 /* Page dir index of Page dir */
|
||||
.globl _PTmap, _PTD, _PTDpde, _Sysmap
|
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.set _PTmap,0xFDC00000
|
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.set _PTD,0xFDFF7000
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.globl _PTmap,_PTD,_PTDpde,_Sysmap
|
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.set _PTmap,PTDPTDI << PDRSHIFT
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.set _PTD,_PTmap + (PTDPTDI * NBPG)
|
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.set _PTDpde,_PTD + (PTDPTDI * 4) /* XXX 4=sizeof pte */
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.set _Sysmap,0xFDFF8000
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.set _PTDpde,0xFDFF7000+4*PDRPDROFF
|
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|
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/*
|
||||
* APTmap, APTD is the alternate recursive pagemap.
|
||||
* It's used when modifying another process's page tables.
|
||||
*/
|
||||
.set APDRPDROFF,0x3FE /* Page dir index of Page dir */
|
||||
.globl _APTmap, _APTD, _APTDpde
|
||||
.set _APTmap,0xFF800000
|
||||
.set _APTD,0xFFBFE000
|
||||
.set _APTDpde,0xFDFF7000+4*APDRPDROFF
|
||||
.globl _APTmap,_APTD,_APTDpde
|
||||
.set _APTmap,APTDPTDI << PDRSHIFT
|
||||
.set _APTD,_APTmap + (APTDPTDI * NBPG)
|
||||
.set _APTDpde,_PTD + (APTDPTDI * 4) /* XXX 4=sizeof pte */
|
||||
|
||||
/*
|
||||
* Access to each processes kernel stack is via a region of
|
||||
@ -166,19 +152,19 @@
|
||||
.globl _esym
|
||||
_esym: .long 0 /* ptr to end of syms */
|
||||
|
||||
.globl _boothowto, _bootdev, _curpcb
|
||||
.globl _boothowto,_bootdev,_curpcb
|
||||
|
||||
.globl _cpu, _cold, _atdevbase
|
||||
.globl _cpu,_cold,_atdevbase
|
||||
_cpu: .long 0 /* are we 386, 386sx, or 486 */
|
||||
_cold: .long 1 /* cold till we are not */
|
||||
_atdevbase: .long 0 /* location of start of iomem in virtual */
|
||||
_atdevphys: .long 0 /* location of device mapping ptes (phys) */
|
||||
|
||||
.globl _IdlePTD, _KPTphys
|
||||
.globl _IdlePTD,_KPTphys
|
||||
_IdlePTD: .long 0
|
||||
_KPTphys: .long 0
|
||||
|
||||
.globl _cyloffset, _proc0paddr
|
||||
.globl _cyloffset,_proc0paddr
|
||||
_cyloffset: .long 0
|
||||
_proc0paddr: .long 0
|
||||
|
||||
@ -311,6 +297,12 @@ ENTRY(btext)
|
||||
/* physical address of Idle Address space */
|
||||
movl %esi,_IdlePTD-KERNBASE
|
||||
|
||||
/*
|
||||
* fillkpt
|
||||
* eax = (page frame address | control | status) == pte
|
||||
* ebx = address of page table
|
||||
* ecx = how many pages to map
|
||||
*/
|
||||
#define fillkpt \
|
||||
1: movl %eax,(%ebx) ; \
|
||||
addl $NBPG,%eax ; /* increment physical address */ \
|
||||
@ -348,7 +340,8 @@ ENTRY(btext)
|
||||
movl $UPAGES,%ecx /* for this many pte s, */
|
||||
lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */
|
||||
lea (KERNBASE)(%eax),%edx
|
||||
movl %edx,_proc0paddr-KERNBASE /* remember VA for 0th process init */
|
||||
movl %edx,_proc0paddr-KERNBASE
|
||||
/* remember VA for 0th process init */
|
||||
orl $PG_V|PG_KW,%eax /* having these bits set, */
|
||||
lea (3*NBPG)(%esi),%ebx /* physical address of stack pt in proc 0 */
|
||||
addl $(PPTEOFF*4),%ebx
|
||||
@ -364,14 +357,14 @@ ENTRY(btext)
|
||||
movl %eax,(%esi) /* which is where temp maps! */
|
||||
|
||||
/* kernel pde's */
|
||||
movl $(SYSPDREND-SYSPDROFF),%ecx /* for this many pde s, */
|
||||
lea (SYSPDROFF*4)(%esi),%ebx /* offset of pde for kernel */
|
||||
movl $(NKPDE),%ecx /* for this many pde s, */
|
||||
lea (KPTDI*4)(%esi),%ebx /* offset of pde for kernel */
|
||||
fillkpt
|
||||
|
||||
/* install a pde recursively mapping page directory as a page table! */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
orl $PG_V|PG_UW,%eax /* pde entry is valid XXX 06 Aug 92 */
|
||||
movl %eax,PDRPDROFF*4(%esi) /* which is where PTmap maps! */
|
||||
movl %eax,PTDPTDI*4(%esi) /* which is where PTmap maps! */
|
||||
|
||||
/* install a pde to map kernel stack for proc 0 */
|
||||
lea (3*NBPG)(%esi),%eax /* physical address of pt in proc 0 */
|
||||
@ -422,7 +415,7 @@ ENTRY(btext)
|
||||
addl $2*6,%esp
|
||||
popal
|
||||
|
||||
/* load base of page directory, and enable mapping */
|
||||
/* load base of page directory and enable mapping */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
orl $I386_CR3PAT,%eax
|
||||
movl %eax,%cr3 /* load ptd addr into mmu */
|
||||
@ -445,9 +438,9 @@ ENTRY(btext)
|
||||
|
||||
begin: /* now running relocated at KERNBASE where the system is linked to run */
|
||||
|
||||
.globl _Crtat /* XXX - locore should not know about */
|
||||
movl _Crtat,%eax /* variables of device drivers (pccons)! */
|
||||
subl $0xfe0a0000,%eax
|
||||
.globl _Crtat /* XXX - locore should not know about */
|
||||
movl _Crtat,%eax /* variables of device drivers (pccons)! */
|
||||
subl $(KERNBASE+0xA0000),%eax
|
||||
movl _atdevphys,%edx /* get pte PA */
|
||||
subl _KPTphys,%edx /* remove base of ptes, now have phys offset */
|
||||
shll $PGSHIFT-2,%edx /* corresponding to virt offset */
|
||||
@ -561,13 +554,12 @@ _szicode:
|
||||
.long _szicode-_icode
|
||||
|
||||
NON_GPROF_ENTRY(sigcode)
|
||||
call 12(%esp)
|
||||
lea 28(%esp),%eax /* scp (the call may have clobbered the */
|
||||
/* copy at 8(%esp)) */
|
||||
/* XXX - use genassym */
|
||||
call SIGF_HANDLER(%esp)
|
||||
lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
|
||||
/* copy at 8(%esp)) */
|
||||
pushl %eax
|
||||
pushl %eax /* junk to fake return address */
|
||||
movl $103,%eax /* sigreturn() */
|
||||
movl $103,%eax /* XXX sigreturn() */
|
||||
LCALL(0x7,0) /* enter kernel with args on stack */
|
||||
hlt /* never gets here */
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user