2008-05-19 23:53:02 +00:00
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/*
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2005-04-16 22:20:36 +00:00
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* rtrap.S: Return from Sparc trap low-level code.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/psr.h>
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#include <asm/asi.h>
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#include <asm/smp.h>
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#include <asm/contregs.h>
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#include <asm/winmacro.h>
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#include <asm/asmmacro.h>
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#include <asm/thread_info.h>
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#define t_psr l0
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#define t_pc l1
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#define t_npc l2
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#define t_wim l3
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#define twin_tmp1 l4
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#define glob_tmp g4
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#define curptr g6
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/* 7 WINDOW SPARC PATCH INSTRUCTIONS */
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.globl rtrap_7win_patch1, rtrap_7win_patch2, rtrap_7win_patch3
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.globl rtrap_7win_patch4, rtrap_7win_patch5
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rtrap_7win_patch1: srl %t_wim, 0x6, %glob_tmp
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rtrap_7win_patch2: and %glob_tmp, 0x7f, %glob_tmp
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rtrap_7win_patch3: srl %g1, 7, %g2
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rtrap_7win_patch4: srl %g2, 6, %g2
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rtrap_7win_patch5: and %g1, 0x7f, %g1
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/* END OF PATCH INSTRUCTIONS */
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/* We need to check for a few things which are:
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* 1) The need to call schedule() because this
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* processes quantum is up.
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* 2) Pending signals for this process, if any
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* exist we need to call do_signal() to do
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* the needy.
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*
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* Else we just check if the rett would land us
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* in an invalid window, if so we need to grab
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* it off the user/kernel stack first.
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*/
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.globl ret_trap_entry, rtrap_patch1, rtrap_patch2
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.globl rtrap_patch3, rtrap_patch4, rtrap_patch5
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.globl ret_trap_lockless_ipi
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ret_trap_entry:
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ret_trap_lockless_ipi:
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andcc %t_psr, PSR_PS, %g0
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sparc: Fix debugger syscall restart interactions.
So, forever, we've had this ptrace_signal_deliver implementation
which tries to handle all of the nasties that can occur when the
debugger looks at a process about to take a signal. It's meant
to address all of these issues inside of the kernel so that the
debugger need not be mindful of such things.
Problem is, this doesn't work.
The idea was that we should do the syscall restart business first, so
that the debugger captures that state. Otherwise, if the debugger for
example saves the child's state, makes the child execute something
else, then restores the saved state, we won't handle the syscall
restart properly because we lose the "we're in a syscall" state.
The code here worked for most cases, but if the debugger actually
passes the signal through to the child unaltered, it's possible that
we would do a syscall restart when we shouldn't have.
In particular this breaks the case of debugging a process under a gdb
which is being debugged by yet another gdb. gdb uses sigsuspend
to wait for SIGCHLD of the inferior, but if gdb itself is being
debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
signal. But ptrace_signal_deliver() assumed the debugger would cancel
out the signal and therefore did a syscall restart, because the return
error was ERESTARTNOHAND.
Fix this by simply making ptrace_signal_deliver() a nop, and providing
a way for the debugger to control system call restarting properly:
1) Report a "in syscall" software bit in regs->{tstate,psr}.
It is set early on in trap entry to a system call and is fully
visible to the debugger via ptrace() and regsets.
2) Test this bit right before doing a syscall restart. We have
to do a final recheck right after get_signal_to_deliver() in
case the debugger cleared the bit during ptrace_stop().
3) Clear the bit in trap return so we don't accidently try to set
that bit in the real register.
As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
like sparc64 has.
M68K has this same exact bug, and is now the only other user of the
ptrace_signal_deliver hook. It needs to be fixed in the same exact
way as sparc.
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-11 09:07:19 +00:00
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sethi %hi(PSR_SYSCALL), %g1
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2005-04-16 22:20:36 +00:00
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be 1f
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sparc: Fix debugger syscall restart interactions.
So, forever, we've had this ptrace_signal_deliver implementation
which tries to handle all of the nasties that can occur when the
debugger looks at a process about to take a signal. It's meant
to address all of these issues inside of the kernel so that the
debugger need not be mindful of such things.
Problem is, this doesn't work.
The idea was that we should do the syscall restart business first, so
that the debugger captures that state. Otherwise, if the debugger for
example saves the child's state, makes the child execute something
else, then restores the saved state, we won't handle the syscall
restart properly because we lose the "we're in a syscall" state.
The code here worked for most cases, but if the debugger actually
passes the signal through to the child unaltered, it's possible that
we would do a syscall restart when we shouldn't have.
In particular this breaks the case of debugging a process under a gdb
which is being debugged by yet another gdb. gdb uses sigsuspend
to wait for SIGCHLD of the inferior, but if gdb itself is being
debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
signal. But ptrace_signal_deliver() assumed the debugger would cancel
out the signal and therefore did a syscall restart, because the return
error was ERESTARTNOHAND.
Fix this by simply making ptrace_signal_deliver() a nop, and providing
a way for the debugger to control system call restarting properly:
1) Report a "in syscall" software bit in regs->{tstate,psr}.
It is set early on in trap entry to a system call and is fully
visible to the debugger via ptrace() and regsets.
2) Test this bit right before doing a syscall restart. We have
to do a final recheck right after get_signal_to_deliver() in
case the debugger cleared the bit during ptrace_stop().
3) Clear the bit in trap return so we don't accidently try to set
that bit in the real register.
As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
like sparc64 has.
M68K has this same exact bug, and is now the only other user of the
ptrace_signal_deliver hook. It needs to be fixed in the same exact
way as sparc.
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-11 09:07:19 +00:00
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andn %t_psr, %g1, %t_psr
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2005-04-16 22:20:36 +00:00
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wr %t_psr, 0x0, %psr
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b ret_trap_kernel
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nop
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1:
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ld [%curptr + TI_FLAGS], %g2
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andcc %g2, (_TIF_NEED_RESCHED), %g0
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be signal_p
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nop
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call schedule
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nop
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ld [%curptr + TI_FLAGS], %g2
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signal_p:
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2008-07-27 10:38:53 +00:00
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andcc %g2, _TIF_DO_NOTIFY_RESUME_MASK, %g0
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2005-04-16 22:20:36 +00:00
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bz,a ret_trap_continue
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ld [%sp + STACKFRAME_SZ + PT_PSR], %t_psr
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2008-07-27 10:38:53 +00:00
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mov %g2, %o2
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2006-01-19 10:42:49 +00:00
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mov %l5, %o1
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2008-07-27 10:38:53 +00:00
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call do_notify_resume
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2006-01-19 10:42:49 +00:00
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add %sp, STACKFRAME_SZ, %o0 ! pt_regs ptr
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2005-04-16 22:20:36 +00:00
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/* Fall through. */
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ld [%sp + STACKFRAME_SZ + PT_PSR], %t_psr
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clr %l6
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ret_trap_continue:
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sparc: Fix debugger syscall restart interactions.
So, forever, we've had this ptrace_signal_deliver implementation
which tries to handle all of the nasties that can occur when the
debugger looks at a process about to take a signal. It's meant
to address all of these issues inside of the kernel so that the
debugger need not be mindful of such things.
Problem is, this doesn't work.
The idea was that we should do the syscall restart business first, so
that the debugger captures that state. Otherwise, if the debugger for
example saves the child's state, makes the child execute something
else, then restores the saved state, we won't handle the syscall
restart properly because we lose the "we're in a syscall" state.
The code here worked for most cases, but if the debugger actually
passes the signal through to the child unaltered, it's possible that
we would do a syscall restart when we shouldn't have.
In particular this breaks the case of debugging a process under a gdb
which is being debugged by yet another gdb. gdb uses sigsuspend
to wait for SIGCHLD of the inferior, but if gdb itself is being
debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
signal. But ptrace_signal_deliver() assumed the debugger would cancel
out the signal and therefore did a syscall restart, because the return
error was ERESTARTNOHAND.
Fix this by simply making ptrace_signal_deliver() a nop, and providing
a way for the debugger to control system call restarting properly:
1) Report a "in syscall" software bit in regs->{tstate,psr}.
It is set early on in trap entry to a system call and is fully
visible to the debugger via ptrace() and regsets.
2) Test this bit right before doing a syscall restart. We have
to do a final recheck right after get_signal_to_deliver() in
case the debugger cleared the bit during ptrace_stop().
3) Clear the bit in trap return so we don't accidently try to set
that bit in the real register.
As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
like sparc64 has.
M68K has this same exact bug, and is now the only other user of the
ptrace_signal_deliver hook. It needs to be fixed in the same exact
way as sparc.
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-11 09:07:19 +00:00
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sethi %hi(PSR_SYSCALL), %g1
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andn %t_psr, %g1, %t_psr
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2005-04-16 22:20:36 +00:00
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wr %t_psr, 0x0, %psr
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WRITE_PAUSE
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ld [%curptr + TI_W_SAVED], %twin_tmp1
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orcc %g0, %twin_tmp1, %g0
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be ret_trap_nobufwins
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nop
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wr %t_psr, PSR_ET, %psr
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WRITE_PAUSE
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mov 1, %o1
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call try_to_clear_window_buffer
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add %sp, STACKFRAME_SZ, %o0
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b signal_p
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ld [%curptr + TI_FLAGS], %g2
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ret_trap_nobufwins:
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/* Load up the user's out registers so we can pull
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* a window from the stack, if necessary.
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*/
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LOAD_PT_INS(sp)
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/* If there are already live user windows in the
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* set we can return from trap safely.
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*/
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ld [%curptr + TI_UWINMASK], %twin_tmp1
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orcc %g0, %twin_tmp1, %g0
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bne ret_trap_userwins_ok
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nop
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/* Calculate new %wim, we have to pull a register
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* window from the users stack.
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*/
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ret_trap_pull_one_window:
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rd %wim, %t_wim
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sll %t_wim, 0x1, %twin_tmp1
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rtrap_patch1: srl %t_wim, 0x7, %glob_tmp
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or %glob_tmp, %twin_tmp1, %glob_tmp
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rtrap_patch2: and %glob_tmp, 0xff, %glob_tmp
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wr %glob_tmp, 0x0, %wim
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/* Here comes the architecture specific
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* branch to the user stack checking routine
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* for return from traps.
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*/
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.globl rtrap_mmu_patchme
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rtrap_mmu_patchme: b sun4c_rett_stackchk
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andcc %fp, 0x7, %g0
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ret_trap_userwins_ok:
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LOAD_PT_PRIV(sp, t_psr, t_pc, t_npc)
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or %t_pc, %t_npc, %g2
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andcc %g2, 0x3, %g0
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2008-05-12 01:05:20 +00:00
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sethi %hi(PSR_SYSCALL), %g2
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2005-04-16 22:20:36 +00:00
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be 1f
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sparc: Fix debugger syscall restart interactions.
So, forever, we've had this ptrace_signal_deliver implementation
which tries to handle all of the nasties that can occur when the
debugger looks at a process about to take a signal. It's meant
to address all of these issues inside of the kernel so that the
debugger need not be mindful of such things.
Problem is, this doesn't work.
The idea was that we should do the syscall restart business first, so
that the debugger captures that state. Otherwise, if the debugger for
example saves the child's state, makes the child execute something
else, then restores the saved state, we won't handle the syscall
restart properly because we lose the "we're in a syscall" state.
The code here worked for most cases, but if the debugger actually
passes the signal through to the child unaltered, it's possible that
we would do a syscall restart when we shouldn't have.
In particular this breaks the case of debugging a process under a gdb
which is being debugged by yet another gdb. gdb uses sigsuspend
to wait for SIGCHLD of the inferior, but if gdb itself is being
debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
signal. But ptrace_signal_deliver() assumed the debugger would cancel
out the signal and therefore did a syscall restart, because the return
error was ERESTARTNOHAND.
Fix this by simply making ptrace_signal_deliver() a nop, and providing
a way for the debugger to control system call restarting properly:
1) Report a "in syscall" software bit in regs->{tstate,psr}.
It is set early on in trap entry to a system call and is fully
visible to the debugger via ptrace() and regsets.
2) Test this bit right before doing a syscall restart. We have
to do a final recheck right after get_signal_to_deliver() in
case the debugger cleared the bit during ptrace_stop().
3) Clear the bit in trap return so we don't accidently try to set
that bit in the real register.
As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
like sparc64 has.
M68K has this same exact bug, and is now the only other user of the
ptrace_signal_deliver hook. It needs to be fixed in the same exact
way as sparc.
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-11 09:07:19 +00:00
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andn %t_psr, %g2, %t_psr
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2005-04-16 22:20:36 +00:00
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b ret_trap_unaligned_pc
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add %sp, STACKFRAME_SZ, %o0
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1:
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LOAD_PT_YREG(sp, g1)
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LOAD_PT_GLOBALS(sp)
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wr %t_psr, 0x0, %psr
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WRITE_PAUSE
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jmp %t_pc
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rett %t_npc
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ret_trap_unaligned_pc:
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ld [%sp + STACKFRAME_SZ + PT_PC], %o1
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ld [%sp + STACKFRAME_SZ + PT_NPC], %o2
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ld [%sp + STACKFRAME_SZ + PT_PSR], %o3
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wr %t_wim, 0x0, %wim ! or else...
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wr %t_psr, PSR_ET, %psr
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WRITE_PAUSE
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call do_memaccess_unaligned
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nop
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b signal_p
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ld [%curptr + TI_FLAGS], %g2
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ret_trap_kernel:
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/* Will the rett land us in the invalid window? */
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mov 2, %g1
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sll %g1, %t_psr, %g1
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rtrap_patch3: srl %g1, 8, %g2
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or %g1, %g2, %g1
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rd %wim, %g2
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andcc %g2, %g1, %g0
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be 1f ! Nope, just return from the trap
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sll %g2, 0x1, %g1
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/* We have to grab a window before returning. */
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rtrap_patch4: srl %g2, 7, %g2
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or %g1, %g2, %g1
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rtrap_patch5: and %g1, 0xff, %g1
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wr %g1, 0x0, %wim
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/* Grrr, make sure we load from the right %sp... */
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LOAD_PT_ALL(sp, t_psr, t_pc, t_npc, g1)
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restore %g0, %g0, %g0
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LOAD_WINDOW(sp)
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b 2f
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save %g0, %g0, %g0
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/* Reload the entire frame in case this is from a
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* kernel system call or whatever...
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*/
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1:
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LOAD_PT_ALL(sp, t_psr, t_pc, t_npc, g1)
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2:
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sparc: Fix debugger syscall restart interactions.
So, forever, we've had this ptrace_signal_deliver implementation
which tries to handle all of the nasties that can occur when the
debugger looks at a process about to take a signal. It's meant
to address all of these issues inside of the kernel so that the
debugger need not be mindful of such things.
Problem is, this doesn't work.
The idea was that we should do the syscall restart business first, so
that the debugger captures that state. Otherwise, if the debugger for
example saves the child's state, makes the child execute something
else, then restores the saved state, we won't handle the syscall
restart properly because we lose the "we're in a syscall" state.
The code here worked for most cases, but if the debugger actually
passes the signal through to the child unaltered, it's possible that
we would do a syscall restart when we shouldn't have.
In particular this breaks the case of debugging a process under a gdb
which is being debugged by yet another gdb. gdb uses sigsuspend
to wait for SIGCHLD of the inferior, but if gdb itself is being
debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
signal. But ptrace_signal_deliver() assumed the debugger would cancel
out the signal and therefore did a syscall restart, because the return
error was ERESTARTNOHAND.
Fix this by simply making ptrace_signal_deliver() a nop, and providing
a way for the debugger to control system call restarting properly:
1) Report a "in syscall" software bit in regs->{tstate,psr}.
It is set early on in trap entry to a system call and is fully
visible to the debugger via ptrace() and regsets.
2) Test this bit right before doing a syscall restart. We have
to do a final recheck right after get_signal_to_deliver() in
case the debugger cleared the bit during ptrace_stop().
3) Clear the bit in trap return so we don't accidently try to set
that bit in the real register.
As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
like sparc64 has.
M68K has this same exact bug, and is now the only other user of the
ptrace_signal_deliver hook. It needs to be fixed in the same exact
way as sparc.
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-11 09:07:19 +00:00
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sethi %hi(PSR_SYSCALL), %twin_tmp1
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andn %t_psr, %twin_tmp1, %t_psr
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2005-04-16 22:20:36 +00:00
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wr %t_psr, 0x0, %psr
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WRITE_PAUSE
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jmp %t_pc
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rett %t_npc
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ret_trap_user_stack_is_bolixed:
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wr %t_wim, 0x0, %wim
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wr %t_psr, PSR_ET, %psr
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WRITE_PAUSE
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call window_ret_fault
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add %sp, STACKFRAME_SZ, %o0
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b signal_p
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ld [%curptr + TI_FLAGS], %g2
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sun4c_rett_stackchk:
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be 1f
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and %fp, 0xfff, %g1 ! delay slot
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b ret_trap_user_stack_is_bolixed + 0x4
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wr %t_wim, 0x0, %wim
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/* See if we have to check the sanity of one page or two */
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1:
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add %g1, 0x38, %g1
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sra %fp, 29, %g2
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add %g2, 0x1, %g2
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andncc %g2, 0x1, %g0
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be 1f
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andncc %g1, 0xff8, %g0
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/* %sp is in vma hole, yuck */
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b ret_trap_user_stack_is_bolixed + 0x4
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wr %t_wim, 0x0, %wim
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1:
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be sun4c_rett_onepage /* Only one page to check */
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lda [%fp] ASI_PTE, %g2
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sun4c_rett_twopages:
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add %fp, 0x38, %g1
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sra %g1, 29, %g2
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add %g2, 0x1, %g2
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andncc %g2, 0x1, %g0
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be 1f
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lda [%g1] ASI_PTE, %g2
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/* Second page is in vma hole */
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b ret_trap_user_stack_is_bolixed + 0x4
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wr %t_wim, 0x0, %wim
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1:
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srl %g2, 29, %g2
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andcc %g2, 0x4, %g0
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bne sun4c_rett_onepage
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lda [%fp] ASI_PTE, %g2
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/* Second page has bad perms */
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b ret_trap_user_stack_is_bolixed + 0x4
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wr %t_wim, 0x0, %wim
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sun4c_rett_onepage:
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srl %g2, 29, %g2
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andcc %g2, 0x4, %g0
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bne,a 1f
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restore %g0, %g0, %g0
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/* A page had bad page permissions, losing... */
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b ret_trap_user_stack_is_bolixed + 0x4
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wr %t_wim, 0x0, %wim
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/* Whee, things are ok, load the window and continue. */
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1:
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LOAD_WINDOW(sp)
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b ret_trap_userwins_ok
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save %g0, %g0, %g0
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.globl srmmu_rett_stackchk
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srmmu_rett_stackchk:
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bne ret_trap_user_stack_is_bolixed
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sethi %hi(PAGE_OFFSET), %g1
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cmp %g1, %fp
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bleu ret_trap_user_stack_is_bolixed
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mov AC_M_SFSR, %g1
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lda [%g1] ASI_M_MMUREGS, %g0
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lda [%g0] ASI_M_MMUREGS, %g1
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or %g1, 0x2, %g1
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sta %g1, [%g0] ASI_M_MMUREGS
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restore %g0, %g0, %g0
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LOAD_WINDOW(sp)
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save %g0, %g0, %g0
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andn %g1, 0x2, %g1
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sta %g1, [%g0] ASI_M_MMUREGS
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mov AC_M_SFAR, %g2
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lda [%g2] ASI_M_MMUREGS, %g2
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mov AC_M_SFSR, %g1
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lda [%g1] ASI_M_MMUREGS, %g1
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andcc %g1, 0x2, %g0
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be ret_trap_userwins_ok
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nop
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b,a ret_trap_user_stack_is_bolixed
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