6c52a96e6c
Current uncorrectable error handling was poor enough that the processor could just loop taking the same trap over and over again. Fix things up so that we at least get a log message and perhaps even some register state. In the process, much consolidation became possible, particularly with the correctable error handler. Prefix assembler and C function names with "spitfire" to indicate that these are for Ultra-I/II/IIi/IIe only. More work is needed to make these routines robust and featureful to the level of the Ultra-III error handlers. Signed-off-by: David S. Miller <davem@davemloft.net>
418 lines
12 KiB
ArmAsm
418 lines
12 KiB
ArmAsm
/* $Id: winfixup.S,v 1.30 2002/02/09 19:49:30 davem Exp $
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*
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* winfixup.S: Handle cases where user stack pointer is found to be bogus.
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*
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <asm/asi.h>
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#include <asm/head.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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#include <asm/spitfire.h>
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#include <asm/thread_info.h>
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.text
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set_pcontext:
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cplus_winfixup_insn_1:
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sethi %hi(0), %l1
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mov PRIMARY_CONTEXT, %g1
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sllx %l1, 32, %l1
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cplus_winfixup_insn_2:
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sethi %hi(0), %g2
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or %l1, %g2, %l1
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stxa %l1, [%g1] ASI_DMMU
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flush %g6
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retl
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nop
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cplus_wfinsn_1:
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sethi %uhi(CTX_CHEETAH_PLUS_NUC), %l1
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cplus_wfinsn_2:
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sethi %hi(CTX_CHEETAH_PLUS_CTX0), %g2
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.align 32
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/* Here are the rules, pay attention.
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*
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* The kernel is disallowed from touching user space while
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* the trap level is greater than zero, except for from within
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* the window spill/fill handlers. This must be followed
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* so that we can easily detect the case where we tried to
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* spill/fill with a bogus (or unmapped) user stack pointer.
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*
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* These are layed out in a special way for cache reasons,
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* don't touch...
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*/
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.globl fill_fixup, spill_fixup
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fill_fixup:
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rdpr %tstate, %g1
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andcc %g1, TSTATE_PRIV, %g0
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or %g4, FAULT_CODE_WINFIXUP, %g4
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be,pt %xcc, window_scheisse_from_user_common
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and %g1, TSTATE_CWP, %g1
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/* This is the extremely complex case, but it does happen from
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* time to time if things are just right. Essentially the restore
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* done in rtrap right before going back to user mode, with tl=1
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* and that levels trap stack registers all setup, took a fill trap,
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* the user stack was not mapped in the tlb, and tlb miss occurred,
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* the pte found was not valid, and a simple ref bit watch update
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* could not satisfy the miss, so we got here.
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*
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* We must carefully unwind the state so we get back to tl=0, preserve
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* all the register values we were going to give to the user. Luckily
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* most things are where they need to be, we also have the address
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* which triggered the fault handy as well.
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*
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* Also note that we must preserve %l5 and %l6. If the user was
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* returning from a system call, we must make it look this way
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* after we process the fill fault on the users stack.
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*
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* First, get into the window where the original restore was executed.
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*/
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rdpr %wstate, %g2 ! Grab user mode wstate.
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wrpr %g1, %cwp ! Get into the right window.
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sll %g2, 3, %g2 ! NORMAL-->OTHER
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wrpr %g0, 0x0, %canrestore ! Standard etrap stuff.
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wrpr %g2, 0x0, %wstate ! This must be consistent.
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wrpr %g0, 0x0, %otherwin ! We know this.
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call set_pcontext ! Change contexts...
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nop
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rdpr %pstate, %l1 ! Prepare to change globals.
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mov %g6, %o7 ! Get current.
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andn %l1, PSTATE_MM, %l1 ! We want to be in RMO
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stb %g4, [%g6 + TI_FAULT_CODE]
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stx %g5, [%g6 + TI_FAULT_ADDR]
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wrpr %g0, 0x0, %tl ! Out of trap levels.
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wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
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mov %o7, %g6
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ldx [%g6 + TI_TASK], %g4
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#ifdef CONFIG_SMP
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mov TSB_REG, %g1
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ldxa [%g1] ASI_IMMU, %g5
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#endif
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/* This is the same as below, except we handle this a bit special
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* since we must preserve %l5 and %l6, see comment above.
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*/
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call do_sparc64_fault
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add %sp, PTREGS_OFF, %o0
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ba,pt %xcc, rtrap
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nop ! yes, nop is correct
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/* Be very careful about usage of the alternate globals here.
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* You cannot touch %g4/%g5 as that has the fault information
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* should this be from usermode. Also be careful for the case
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* where we get here from the save instruction in etrap.S when
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* coming from either user or kernel (does not matter which, it
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* is the same problem in both cases). Essentially this means
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* do not touch %g7 or %g2 so we handle the two cases fine.
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*/
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spill_fixup:
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ldx [%g6 + TI_FLAGS], %g1
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andcc %g1, _TIF_32BIT, %g0
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ldub [%g6 + TI_WSAVED], %g1
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sll %g1, 3, %g3
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add %g6, %g3, %g3
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stx %sp, [%g3 + TI_RWIN_SPTRS]
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sll %g1, 7, %g3
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bne,pt %xcc, 1f
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add %g6, %g3, %g3
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stx %l0, [%g3 + TI_REG_WINDOW + 0x00]
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stx %l1, [%g3 + TI_REG_WINDOW + 0x08]
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stx %l2, [%g3 + TI_REG_WINDOW + 0x10]
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stx %l3, [%g3 + TI_REG_WINDOW + 0x18]
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stx %l4, [%g3 + TI_REG_WINDOW + 0x20]
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stx %l5, [%g3 + TI_REG_WINDOW + 0x28]
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stx %l6, [%g3 + TI_REG_WINDOW + 0x30]
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stx %l7, [%g3 + TI_REG_WINDOW + 0x38]
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stx %i0, [%g3 + TI_REG_WINDOW + 0x40]
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stx %i1, [%g3 + TI_REG_WINDOW + 0x48]
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stx %i2, [%g3 + TI_REG_WINDOW + 0x50]
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stx %i3, [%g3 + TI_REG_WINDOW + 0x58]
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stx %i4, [%g3 + TI_REG_WINDOW + 0x60]
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stx %i5, [%g3 + TI_REG_WINDOW + 0x68]
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stx %i6, [%g3 + TI_REG_WINDOW + 0x70]
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b,pt %xcc, 2f
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stx %i7, [%g3 + TI_REG_WINDOW + 0x78]
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1: stw %l0, [%g3 + TI_REG_WINDOW + 0x00]
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stw %l1, [%g3 + TI_REG_WINDOW + 0x04]
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stw %l2, [%g3 + TI_REG_WINDOW + 0x08]
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stw %l3, [%g3 + TI_REG_WINDOW + 0x0c]
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stw %l4, [%g3 + TI_REG_WINDOW + 0x10]
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stw %l5, [%g3 + TI_REG_WINDOW + 0x14]
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stw %l6, [%g3 + TI_REG_WINDOW + 0x18]
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stw %l7, [%g3 + TI_REG_WINDOW + 0x1c]
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stw %i0, [%g3 + TI_REG_WINDOW + 0x20]
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stw %i1, [%g3 + TI_REG_WINDOW + 0x24]
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stw %i2, [%g3 + TI_REG_WINDOW + 0x28]
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stw %i3, [%g3 + TI_REG_WINDOW + 0x2c]
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stw %i4, [%g3 + TI_REG_WINDOW + 0x30]
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stw %i5, [%g3 + TI_REG_WINDOW + 0x34]
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stw %i6, [%g3 + TI_REG_WINDOW + 0x38]
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stw %i7, [%g3 + TI_REG_WINDOW + 0x3c]
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2: add %g1, 1, %g1
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stb %g1, [%g6 + TI_WSAVED]
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rdpr %tstate, %g1
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andcc %g1, TSTATE_PRIV, %g0
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saved
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and %g1, TSTATE_CWP, %g1
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be,pn %xcc, window_scheisse_from_user_common
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mov FAULT_CODE_WRITE | FAULT_CODE_DTLB | FAULT_CODE_WINFIXUP, %g4
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retry
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window_scheisse_from_user_common:
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stb %g4, [%g6 + TI_FAULT_CODE]
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stx %g5, [%g6 + TI_FAULT_ADDR]
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wrpr %g1, %cwp
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ba,pt %xcc, etrap
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rd %pc, %g7
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call do_sparc64_fault
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap_clr_l6
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.globl winfix_mna, fill_fixup_mna, spill_fixup_mna
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winfix_mna:
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andn %g3, 0x7f, %g3
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add %g3, 0x78, %g3
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wrpr %g3, %tnpc
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done
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fill_fixup_mna:
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rdpr %tstate, %g1
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andcc %g1, TSTATE_PRIV, %g0
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be,pt %xcc, window_mna_from_user_common
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and %g1, TSTATE_CWP, %g1
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/* Please, see fill_fixup commentary about why we must preserve
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* %l5 and %l6 to preserve absolute correct semantics.
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*/
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rdpr %wstate, %g2 ! Grab user mode wstate.
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wrpr %g1, %cwp ! Get into the right window.
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sll %g2, 3, %g2 ! NORMAL-->OTHER
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wrpr %g0, 0x0, %canrestore ! Standard etrap stuff.
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wrpr %g2, 0x0, %wstate ! This must be consistent.
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wrpr %g0, 0x0, %otherwin ! We know this.
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call set_pcontext ! Change contexts...
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nop
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rdpr %pstate, %l1 ! Prepare to change globals.
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mov %g4, %o2 ! Setup args for
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mov %g5, %o1 ! final call to mem_address_unaligned.
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andn %l1, PSTATE_MM, %l1 ! We want to be in RMO
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mov %g6, %o7 ! Stash away current.
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wrpr %g0, 0x0, %tl ! Out of trap levels.
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wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
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mov %o7, %g6 ! Get current back.
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ldx [%g6 + TI_TASK], %g4 ! Finish it.
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#ifdef CONFIG_SMP
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mov TSB_REG, %g1
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ldxa [%g1] ASI_IMMU, %g5
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#endif
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call mem_address_unaligned
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add %sp, PTREGS_OFF, %o0
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b,pt %xcc, rtrap
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nop ! yes, the nop is correct
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spill_fixup_mna:
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ldx [%g6 + TI_FLAGS], %g1
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andcc %g1, _TIF_32BIT, %g0
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ldub [%g6 + TI_WSAVED], %g1
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sll %g1, 3, %g3
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add %g6, %g3, %g3
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stx %sp, [%g3 + TI_RWIN_SPTRS]
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sll %g1, 7, %g3
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bne,pt %xcc, 1f
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add %g6, %g3, %g3
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stx %l0, [%g3 + TI_REG_WINDOW + 0x00]
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stx %l1, [%g3 + TI_REG_WINDOW + 0x08]
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stx %l2, [%g3 + TI_REG_WINDOW + 0x10]
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stx %l3, [%g3 + TI_REG_WINDOW + 0x18]
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stx %l4, [%g3 + TI_REG_WINDOW + 0x20]
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stx %l5, [%g3 + TI_REG_WINDOW + 0x28]
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stx %l6, [%g3 + TI_REG_WINDOW + 0x30]
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stx %l7, [%g3 + TI_REG_WINDOW + 0x38]
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stx %i0, [%g3 + TI_REG_WINDOW + 0x40]
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stx %i1, [%g3 + TI_REG_WINDOW + 0x48]
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stx %i2, [%g3 + TI_REG_WINDOW + 0x50]
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stx %i3, [%g3 + TI_REG_WINDOW + 0x58]
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stx %i4, [%g3 + TI_REG_WINDOW + 0x60]
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stx %i5, [%g3 + TI_REG_WINDOW + 0x68]
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stx %i6, [%g3 + TI_REG_WINDOW + 0x70]
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stx %i7, [%g3 + TI_REG_WINDOW + 0x78]
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b,pt %xcc, 2f
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add %g1, 1, %g1
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1: std %l0, [%g3 + TI_REG_WINDOW + 0x00]
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std %l2, [%g3 + TI_REG_WINDOW + 0x08]
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std %l4, [%g3 + TI_REG_WINDOW + 0x10]
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std %l6, [%g3 + TI_REG_WINDOW + 0x18]
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std %i0, [%g3 + TI_REG_WINDOW + 0x20]
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std %i2, [%g3 + TI_REG_WINDOW + 0x28]
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std %i4, [%g3 + TI_REG_WINDOW + 0x30]
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std %i6, [%g3 + TI_REG_WINDOW + 0x38]
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add %g1, 1, %g1
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2: stb %g1, [%g6 + TI_WSAVED]
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rdpr %tstate, %g1
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andcc %g1, TSTATE_PRIV, %g0
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saved
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be,pn %xcc, window_mna_from_user_common
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and %g1, TSTATE_CWP, %g1
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retry
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window_mna_from_user_common:
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wrpr %g1, %cwp
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sethi %hi(109f), %g7
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ba,pt %xcc, etrap
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109: or %g7, %lo(109b), %g7
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mov %l4, %o2
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mov %l5, %o1
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call mem_address_unaligned
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add %sp, PTREGS_OFF, %o0
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ba,pt %xcc, rtrap
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clr %l6
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/* These are only needed for 64-bit mode processes which
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* put their stack pointer into the VPTE area and there
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* happens to be a VPTE tlb entry mapped there during
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* a spill/fill trap to that stack frame.
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*/
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.globl winfix_dax, fill_fixup_dax, spill_fixup_dax
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winfix_dax:
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andn %g3, 0x7f, %g3
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add %g3, 0x74, %g3
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wrpr %g3, %tnpc
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done
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fill_fixup_dax:
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rdpr %tstate, %g1
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andcc %g1, TSTATE_PRIV, %g0
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be,pt %xcc, window_dax_from_user_common
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and %g1, TSTATE_CWP, %g1
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/* Please, see fill_fixup commentary about why we must preserve
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* %l5 and %l6 to preserve absolute correct semantics.
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*/
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rdpr %wstate, %g2 ! Grab user mode wstate.
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wrpr %g1, %cwp ! Get into the right window.
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sll %g2, 3, %g2 ! NORMAL-->OTHER
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wrpr %g0, 0x0, %canrestore ! Standard etrap stuff.
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wrpr %g2, 0x0, %wstate ! This must be consistent.
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wrpr %g0, 0x0, %otherwin ! We know this.
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call set_pcontext ! Change contexts...
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nop
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rdpr %pstate, %l1 ! Prepare to change globals.
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mov %g4, %o1 ! Setup args for
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mov %g5, %o2 ! final call to spitfire_data_access_exception.
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andn %l1, PSTATE_MM, %l1 ! We want to be in RMO
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mov %g6, %o7 ! Stash away current.
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wrpr %g0, 0x0, %tl ! Out of trap levels.
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wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
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mov %o7, %g6 ! Get current back.
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ldx [%g6 + TI_TASK], %g4 ! Finish it.
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#ifdef CONFIG_SMP
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mov TSB_REG, %g1
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ldxa [%g1] ASI_IMMU, %g5
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#endif
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call spitfire_data_access_exception
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add %sp, PTREGS_OFF, %o0
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b,pt %xcc, rtrap
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nop ! yes, the nop is correct
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spill_fixup_dax:
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ldx [%g6 + TI_FLAGS], %g1
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andcc %g1, _TIF_32BIT, %g0
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ldub [%g6 + TI_WSAVED], %g1
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sll %g1, 3, %g3
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add %g6, %g3, %g3
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stx %sp, [%g3 + TI_RWIN_SPTRS]
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sll %g1, 7, %g3
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bne,pt %xcc, 1f
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add %g6, %g3, %g3
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stx %l0, [%g3 + TI_REG_WINDOW + 0x00]
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stx %l1, [%g3 + TI_REG_WINDOW + 0x08]
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stx %l2, [%g3 + TI_REG_WINDOW + 0x10]
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stx %l3, [%g3 + TI_REG_WINDOW + 0x18]
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stx %l4, [%g3 + TI_REG_WINDOW + 0x20]
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stx %l5, [%g3 + TI_REG_WINDOW + 0x28]
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stx %l6, [%g3 + TI_REG_WINDOW + 0x30]
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stx %l7, [%g3 + TI_REG_WINDOW + 0x38]
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stx %i0, [%g3 + TI_REG_WINDOW + 0x40]
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stx %i1, [%g3 + TI_REG_WINDOW + 0x48]
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stx %i2, [%g3 + TI_REG_WINDOW + 0x50]
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stx %i3, [%g3 + TI_REG_WINDOW + 0x58]
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stx %i4, [%g3 + TI_REG_WINDOW + 0x60]
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stx %i5, [%g3 + TI_REG_WINDOW + 0x68]
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stx %i6, [%g3 + TI_REG_WINDOW + 0x70]
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stx %i7, [%g3 + TI_REG_WINDOW + 0x78]
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b,pt %xcc, 2f
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add %g1, 1, %g1
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1: std %l0, [%g3 + TI_REG_WINDOW + 0x00]
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std %l2, [%g3 + TI_REG_WINDOW + 0x08]
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std %l4, [%g3 + TI_REG_WINDOW + 0x10]
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std %l6, [%g3 + TI_REG_WINDOW + 0x18]
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std %i0, [%g3 + TI_REG_WINDOW + 0x20]
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std %i2, [%g3 + TI_REG_WINDOW + 0x28]
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std %i4, [%g3 + TI_REG_WINDOW + 0x30]
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std %i6, [%g3 + TI_REG_WINDOW + 0x38]
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add %g1, 1, %g1
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2: stb %g1, [%g6 + TI_WSAVED]
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rdpr %tstate, %g1
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andcc %g1, TSTATE_PRIV, %g0
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saved
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be,pn %xcc, window_dax_from_user_common
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and %g1, TSTATE_CWP, %g1
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retry
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window_dax_from_user_common:
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wrpr %g1, %cwp
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|
sethi %hi(109f), %g7
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|
ba,pt %xcc, etrap
|
|
109: or %g7, %lo(109b), %g7
|
|
mov %l4, %o1
|
|
mov %l5, %o2
|
|
call spitfire_data_access_exception
|
|
add %sp, PTREGS_OFF, %o0
|
|
ba,pt %xcc, rtrap
|
|
clr %l6
|
|
|
|
|
|
.globl cheetah_plus_patch_winfixup
|
|
cheetah_plus_patch_winfixup:
|
|
sethi %hi(cplus_wfinsn_1), %o0
|
|
sethi %hi(cplus_winfixup_insn_1), %o2
|
|
lduw [%o0 + %lo(cplus_wfinsn_1)], %o1
|
|
or %o2, %lo(cplus_winfixup_insn_1), %o2
|
|
stw %o1, [%o2]
|
|
flush %o2
|
|
|
|
sethi %hi(cplus_wfinsn_2), %o0
|
|
sethi %hi(cplus_winfixup_insn_2), %o2
|
|
lduw [%o0 + %lo(cplus_wfinsn_2)], %o1
|
|
or %o2, %lo(cplus_winfixup_insn_2), %o2
|
|
stw %o1, [%o2]
|
|
flush %o2
|
|
|
|
retl
|
|
nop
|