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kernel-ark/arch/sparc/kernel/rtrap_64.S

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sparc64: remove CVS keywords This patch removes the CVS keywords that weren't updated for a long time from comments. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-19 23:52:27 +00:00
/*
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
* rtrap.S: Preparing for return from trap on Sparc V9.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
*/
#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/spitfire.h>
#include <asm/head.h>
#include <asm/visasm.h>
#include <asm/processor.h>
sparc64: Run the kernel always in the TSO memory model. The fact of the matter is, all UltraSPARC-III and later chips only implement TSO. They don't implement PSO and RMO memory models at all. Only the Ultra-I and Ultra-II family chips implement RMO and they are only helped marginally by using this setting when executing kernel code. The big plus to doing this is that we can eliminate all of the non-Sync memory barriers in the kernel except for the ones used in the optimized memcpy/memset code (these use block load and store operations which have their own memory ordering rules). Signed-off-by: David S. Miller <davem@davemloft.net>
2008-10-30 04:25:00 +00:00
#define RTRAP_PSTATE (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
#define RTRAP_PSTATE_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV)
#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
.text
.align 32
__handle_preemption:
call schedule
wrpr %g0, RTRAP_PSTATE, %pstate
ba,pt %xcc, __handle_preemption_continue
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
__handle_user_windows:
call fault_in_user_windows
wrpr %g0, RTRAP_PSTATE, %pstate
sparc: keep calling do_signal() as long as pending signals remain Analog of what commit 494486a1d2697f2153199b6501ab5b4d6e15a2bb had done to alpha (another architecture with similar bug). One note: in rtrap_32.S part clr %l6 has been a rudiment of left after commit 28e6103665301ce60634e8a77f0b657c6cc099de (sparc: Fix debugger syscall restart interactions) has killed %l6 use in there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-24 04:52:52 +00:00
ba,pt %xcc, __handle_preemption_continue
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
__handle_userfpu:
rd %fprs, %l5
andcc %l5, FPRS_FEF, %g0
sethi %hi(TSTATE_PEF), %o0
be,a,pn %icc, __handle_userfpu_continue
andn %l1, %o0, %l1
ba,a,pt %xcc, __handle_userfpu_continue
__handle_signal:
[SPARC]: Add support for *at(), ppoll, and pselect syscalls. This also includes by necessity _TIF_RESTORE_SIGMASK support, which actually resulted in a lot of cleanups. The sparc signal handling code is quite a mess and I should clean it up some day. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-19 10:42:49 +00:00
mov %l5, %o1
add %sp, PTREGS_OFF, %o0
[SPARC64]: %l6 trap return handling no longer necessary. Now that we indicate the "restart system call" in the trap type field of pt_regs->magic, we don't need to set the %l6 boolean in all of the trap return paths. And we therefore don't need to pass it to do_notify_resume(). Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-24 10:15:22 +00:00
mov %l0, %o2
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
call do_notify_resume
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
/* Signal delivery can modify pt_regs tstate, so we must
* reload it.
*/
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
sethi %hi(0xf << 20), %l4
and %l1, %l4, %l4
sparc: keep calling do_signal() as long as pending signals remain Analog of what commit 494486a1d2697f2153199b6501ab5b4d6e15a2bb had done to alpha (another architecture with similar bug). One note: in rtrap_32.S part clr %l6 has been a rudiment of left after commit 28e6103665301ce60634e8a77f0b657c6cc099de (sparc: Fix debugger syscall restart interactions) has killed %l6 use in there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-24 04:52:52 +00:00
ba,pt %xcc, __handle_preemption_continue
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
andn %l1, %l4, %l1
sparc64: Make special trap return path for TRAP_NMI(). We don't want the rtrap path to try and run softirqs or anything like that when returning from a PIL==15 NMI. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-26 06:24:59 +00:00
/* When returning from a NMI (%pil==15) interrupt we want to
* avoid running softirqs, doing IRQ tracing, preempting, etc.
*/
.globl rtrap_nmi
rtrap_nmi: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
sethi %hi(0xf << 20), %l4
and %l1, %l4, %l4
andn %l1, %l4, %l1
srl %l4, 20, %l4
ba,pt %xcc, rtrap_no_irq_enable
wrpr %l4, %pil
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
.align 64
[SPARC64]: %l6 trap return handling no longer necessary. Now that we indicate the "restart system call" in the trap type field of pt_regs->magic, we don't need to set the %l6 boolean in all of the trap return paths. And we therefore don't need to pass it to do_notify_resume(). Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-24 10:15:22 +00:00
.globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
rtrap_irq:
rtrap:
/* mm/ultra.S:xcall_report_regs KNOWS about this load. */
sparc64: Remove trap return code which is now unnecessary. Noticed by Linus. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-13 20:56:46 +00:00
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
rtrap_xcall:
sethi %hi(0xf << 20), %l4
and %l1, %l4, %l4
[SPARC64]: Add irqtrace/stacktrace/lockdep support. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-11-16 21:38:57 +00:00
andn %l1, %l4, %l1
srl %l4, 20, %l4
#ifdef CONFIG_TRACE_IRQFLAGS
brnz,pn %l4, rtrap_no_irq_enable
nop
call trace_hardirqs_on
nop
sparc64: Fix hardirq tracing in trap return path. We can overflow the hardirq stack if we set the %pil here so early, just let the normal control flow do it. This is fine as we are allowed to do the actual IRQ enable at any point after we call trace_hardirqs_on. Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-20 07:48:37 +00:00
/* Do not actually set the %pil here. We will do that
* below after we clear PSTATE_IE in the %pstate register.
* If we re-enable interrupts here, we can recurse down
* the hardirq stack potentially endlessly, causing a
* stack overflow.
*
* It is tempting to put this test and trace_hardirqs_on
* call at the 'rt_continue' label, but that will not work
* as that path hits unconditionally and we do not want to
* execute this in NMI return paths, for example.
*/
[SPARC64]: Add irqtrace/stacktrace/lockdep support. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-11-16 21:38:57 +00:00
#endif
sparc64: Make special trap return path for TRAP_NMI(). We don't want the rtrap path to try and run softirqs or anything like that when returning from a PIL==15 NMI. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-26 06:24:59 +00:00
rtrap_no_irq_enable:
[SPARC64]: Add irqtrace/stacktrace/lockdep support. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-11-16 21:38:57 +00:00
andcc %l1, TSTATE_PRIV, %l3
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
bne,pn %icc, to_kernel
[SPARC64]: Add irqtrace/stacktrace/lockdep support. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-11-16 21:38:57 +00:00
nop
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* We must hold IRQs off and atomically test schedule+signal
* state, then hold them off all the way back to userspace.
[SPARC64]: Add irqtrace/stacktrace/lockdep support. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-11-16 21:38:57 +00:00
* If we are returning to kernel, none of this matters. Note
* that we are disabling interrupts via PSTATE_IE, not using
* %pil.
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
*
* If we do not do this, there is a window where we would do
* the tests, later the signal/resched event arrives but we do
* not process it since we are still in kernel mode. It would
* take until the next local IRQ before the signal/resched
* event would be handled.
*
sparc64: Kill off old sys_perfctr system call and state. People should be using the perf events interfaces, and the way these system call facilities used the %pcr conflicts with the usage of the NMI watchdog and perf events. Signed-off-by: David S. Miller <davem@davemloft.net>
2010-03-03 16:08:49 +00:00
* This also means that if we have to deal with user
* windows, we have to redo all of these sched+signal checks
* with IRQs disabled.
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
*/
to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
wrpr 0, %pil
__handle_preemption_continue:
ldx [%g6 + TI_FLAGS], %l0
sethi %hi(_TIF_USER_WORK_MASK), %o0
or %o0, %lo(_TIF_USER_WORK_MASK), %o0
andcc %l0, %o0, %g0
sethi %hi(TSTATE_PEF), %o0
be,pt %xcc, user_nowork
andcc %l1, %o0, %g0
andcc %l0, _TIF_NEED_RESCHED, %g0
bne,pn %xcc, __handle_preemption
sparc64: tracehook: TIF_NOTIFY_RESUME This adds TIF_NOTIFY_RESUME support for sparc64. When set, we call tracehook_notify_resume() on the way to user mode. Signed-off-by: Roland McGrath <roland@redhat.com>
2008-04-20 22:06:49 +00:00
andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
bne,pn %xcc, __handle_signal
ldub [%g6 + TI_WSAVED], %o2
brnz,pn %o2, __handle_user_windows
nop
sethi %hi(TSTATE_PEF), %o0
sparc64: Kill off old sys_perfctr system call and state. People should be using the perf events interfaces, and the way these system call facilities used the %pcr conflicts with the usage of the NMI watchdog and perf events. Signed-off-by: David S. Miller <davem@davemloft.net>
2010-03-03 16:08:49 +00:00
andcc %l1, %o0, %g0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
/* This fpdepth clear is necessary for non-syscall rtraps only */
user_nowork:
bne,pn %xcc, __handle_userfpu
stb %g0, [%g6 + TI_FPDEPTH]
__handle_userfpu_continue:
rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2
ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3
ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
[SPARC64]: Elminate all usage of hard-coded trap globals. UltraSPARC has special sets of global registers which are switched to for certain trap types. There is one set for MMU related traps, one set of Interrupt Vector processing, and another set (called the Alternate globals) for all other trap types. For what seems like forever we've hard coded the values in some of these trap registers. Some examples include: 1) Interrupt Vector global %g6 holds current processors interrupt work struct where received interrupts are managed for IRQ handler dispatch. 2) MMU global %g7 holds the base of the page tables of the currently active address space. 3) Alternate global %g6 held the current_thread_info() value. Such hardcoding has resulted in some serious issues in many areas. There are some code sequences where having another register available would help clean up the implementation. Taking traps such as cross-calls from the OBP firmware requires some trick code sequences wherein we have to save away and restore all of the special sets of global registers when we enter/exit OBP. We were also using the IMMU TSB register on SMP to hold the per-cpu area base address, which doesn't work any longer now that we actually use the TSB facility of the cpu. The implementation is pretty straight forward. One tricky bit is getting the current processor ID as that is different on different cpu variants. We use a stub with a fancy calling convention which we patch at boot time. The calling convention is that the stub is branched to and the (PC - 4) to return to is in register %g1. The cpu number is left in %g6. This stub can be invoked by using the __GET_CPUID macro. We use an array of per-cpu trap state to store the current thread and physical address of the current address space's page tables. The TRAP_LOAD_THREAD_REG loads %g6 with the current thread from this table, it uses __GET_CPUID and also clobbers %g1. TRAP_LOAD_IRQ_WORK is used by the interrupt vector processing to load the current processor's IRQ software state into %g6. It also uses __GET_CPUID and clobbers %g1. Finally, TRAP_LOAD_PGD_PHYS loads the physical address base of the current address space's page tables into %g7, it clobbers %g1 and uses __GET_CPUID. Many refinements are possible, as well as some tuning, with this stuff in place. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-27 07:24:22 +00:00
brz,pt %l3, 1f
[SPARC64]: Kill all %pstate changes in context switch code. They are totally unnecessary because: 1) Interrupts are already disabled when switch_to() runs. 2) We don't use hard-coded alternate globals any longer. This found a case in rtrap, which still assumed alternate global %g6 was current_thread_info(), and that is fixed by this changeset as well. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-06 05:59:03 +00:00
mov %g6, %l2
[SPARC64]: Elminate all usage of hard-coded trap globals. UltraSPARC has special sets of global registers which are switched to for certain trap types. There is one set for MMU related traps, one set of Interrupt Vector processing, and another set (called the Alternate globals) for all other trap types. For what seems like forever we've hard coded the values in some of these trap registers. Some examples include: 1) Interrupt Vector global %g6 holds current processors interrupt work struct where received interrupts are managed for IRQ handler dispatch. 2) MMU global %g7 holds the base of the page tables of the currently active address space. 3) Alternate global %g6 held the current_thread_info() value. Such hardcoding has resulted in some serious issues in many areas. There are some code sequences where having another register available would help clean up the implementation. Taking traps such as cross-calls from the OBP firmware requires some trick code sequences wherein we have to save away and restore all of the special sets of global registers when we enter/exit OBP. We were also using the IMMU TSB register on SMP to hold the per-cpu area base address, which doesn't work any longer now that we actually use the TSB facility of the cpu. The implementation is pretty straight forward. One tricky bit is getting the current processor ID as that is different on different cpu variants. We use a stub with a fancy calling convention which we patch at boot time. The calling convention is that the stub is branched to and the (PC - 4) to return to is in register %g1. The cpu number is left in %g6. This stub can be invoked by using the __GET_CPUID macro. We use an array of per-cpu trap state to store the current thread and physical address of the current address space's page tables. The TRAP_LOAD_THREAD_REG loads %g6 with the current thread from this table, it uses __GET_CPUID and also clobbers %g1. TRAP_LOAD_IRQ_WORK is used by the interrupt vector processing to load the current processor's IRQ software state into %g6. It also uses __GET_CPUID and clobbers %g1. Finally, TRAP_LOAD_PGD_PHYS loads the physical address base of the current address space's page tables into %g7, it clobbers %g1 and uses __GET_CPUID. Many refinements are possible, as well as some tuning, with this stuff in place. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-27 07:24:22 +00:00
/* Must do this before thread reg is clobbered below. */
[SPARC64]: Add explicit register args to trap state loading macros. This, as well as making the code cleaner, allows a simplification in the TSB miss handling path. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-03 05:55:10 +00:00
LOAD_PER_CPU_BASE(%g5, %g6, %i0, %i1, %i2)
[SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 02:29:18 +00:00
1:
ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
[SPARC64]: Add initial code to twiddle %gl on trap entry/exit. Instead of setting/clearing PSTATE_AG we have to change the %gl register value on sun4v. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-06 05:29:28 +00:00
/* Normal globals are restored, go to trap globals. */
661: wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
[SPARC64]: Fix return from trap on SUN4V. We need to set the global register set _AND_ disable PSTATE_IE in %pstate. The original patch sequence was leaving PSTATE_IE enabled when returning to kernel mode, oops. This fixes the random register corruption being seen on SUN4V. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-17 00:23:45 +00:00
nop
.section .sun4v_2insn_patch, "ax"
[SPARC64]: Add initial code to twiddle %gl on trap entry/exit. Instead of setting/clearing PSTATE_AG we have to change the %gl register value on sun4v. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-06 05:29:28 +00:00
.word 661b
[SPARC64]: Fix return from trap on SUN4V. We need to set the global register set _AND_ disable PSTATE_IE in %pstate. The original patch sequence was leaving PSTATE_IE enabled when returning to kernel mode, oops. This fixes the random register corruption being seen on SUN4V. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-17 00:23:45 +00:00
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
[SPARC64]: Add initial code to twiddle %gl on trap entry/exit. Instead of setting/clearing PSTATE_AG we have to change the %gl register value on sun4v. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-06 05:29:28 +00:00
SET_GL(1)
.previous
[SPARC64]: Kill all %pstate changes in context switch code. They are totally unnecessary because: 1) Interrupts are already disabled when switch_to() runs. 2) We don't use hard-coded alternate globals any longer. This found a case in rtrap, which still assumed alternate global %g6 was current_thread_info(), and that is fixed by this changeset as well. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-06 05:59:03 +00:00
mov %l2, %g6
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6
ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7
ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2
ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2
ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
wr %o3, %g0, %y
wrpr %l4, 0x0, %pil
wrpr %g0, 0x1, %tl
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
andn %l1, TSTATE_SYSCALL, %l1
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
wrpr %l1, %g0, %tstate
wrpr %l2, %g0, %tpc
wrpr %o2, %g0, %tnpc
brnz,pn %l3, kern_rtt
mov PRIMARY_CONTEXT, %l7
[SPARC64]: Patch up mmu context register writes for sun4v. sun4v uses ASI_MMU instead of ASI_DMMU Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-08 06:13:05 +00:00
661: ldxa [%l7 + %l7] ASI_DMMU, %l0
.section .sun4v_1insn_patch, "ax"
.word 661b
ldxa [%l7 + %l7] ASI_MMU, %l0
.previous
[SPARC64]: Replace cheetah+ code patching with variables. Instead of code patching to handle the page size fields in the context registers, just use variables from which we get the proper values. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-04 22:23:20 +00:00
sethi %hi(sparc64_kern_pri_nuc_bits), %l1
ldx [%l1 + %lo(sparc64_kern_pri_nuc_bits)], %l1
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
or %l0, %l1, %l0
[SPARC64]: Patch up mmu context register writes for sun4v. sun4v uses ASI_MMU instead of ASI_DMMU Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-08 06:13:05 +00:00
661: stxa %l0, [%l7] ASI_DMMU
.section .sun4v_1insn_patch, "ax"
.word 661b
stxa %l0, [%l7] ASI_MMU
.previous
[SPARC64]: Fix bogus flush instruction usage. Some of the trap code was still assuming that alternate global %g6 was hard coded with current_thread_info(). Let's just consistently flush at KERNBASE when we need a pipeline synchronization. That's locked into the TLB and will always work. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-01 02:33:00 +00:00
sethi %hi(KERNBASE), %l7
flush %l7
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
rdpr %wstate, %l1
rdpr %otherwin, %l2
srl %l1, 3, %l1
wrpr %l2, %g0, %canrestore
wrpr %l1, %g0, %wstate
[SPARC64]: Refine register window trap handling. When saving and restoing trap state, do the window spill/fill handling inline so that we never trap deeper than 2 trap levels. This is important for chips like Niagara. The window fixup code is massively simplified, and many more improvements are now possible. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-04 08:10:01 +00:00
brnz,pt %l2, user_rtt_restore
wrpr %g0, %g0, %otherwin
ldx [%g6 + TI_FLAGS], %g3
wr %g0, ASI_AIUP, %asi
rdpr %cwp, %g1
andcc %g3, _TIF_32BIT, %g0
sub %g1, 1, %g1
bne,pt %xcc, user_rtt_fill_32bit
wrpr %g1, %cwp
ba,a,pt %xcc, user_rtt_fill_64bit
user_rtt_fill_fixup:
rdpr %cwp, %g1
add %g1, 1, %g1
wrpr %g1, 0x0, %cwp
rdpr %wstate, %g2
sll %g2, 3, %g2
wrpr %g2, 0x0, %wstate
/* We know %canrestore and %otherwin are both zero. */
sethi %hi(sparc64_kern_pri_context), %g2
ldx [%g2 + %lo(sparc64_kern_pri_context)], %g2
mov PRIMARY_CONTEXT, %g1
[SPARC64]: Patch up mmu context register writes for sun4v. sun4v uses ASI_MMU instead of ASI_DMMU Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-08 06:13:05 +00:00
661: stxa %g2, [%g1] ASI_DMMU
.section .sun4v_1insn_patch, "ax"
.word 661b
stxa %g2, [%g1] ASI_MMU
.previous
[SPARC64]: Refine register window trap handling. When saving and restoing trap state, do the window spill/fill handling inline so that we never trap deeper than 2 trap levels. This is important for chips like Niagara. The window fixup code is massively simplified, and many more improvements are now possible. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-04 08:10:01 +00:00
sethi %hi(KERNBASE), %g1
flush %g1
or %g4, FAULT_CODE_WINFIXUP, %g4
stb %g4, [%g6 + TI_FAULT_CODE]
stx %g5, [%g6 + TI_FAULT_ADDR]
mov %g6, %l1
wrpr %g0, 0x0, %tl
[SPARC64]: Add initial code to twiddle %gl on trap entry/exit. Instead of setting/clearing PSTATE_AG we have to change the %gl register value on sun4v. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-06 05:29:28 +00:00
661: nop
[SPARC64]: Rename gl_{1,2}insn_patch --> sun4v_{1,2}insn_patch Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-07 08:00:16 +00:00
.section .sun4v_1insn_patch, "ax"
[SPARC64]: Add initial code to twiddle %gl on trap entry/exit. Instead of setting/clearing PSTATE_AG we have to change the %gl register value on sun4v. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-06 05:29:28 +00:00
.word 661b
SET_GL(0)
.previous
[SPARC64]: Drop %gl to 0 before re-enabling PSTATE_IE in rtrap If we take a window fault, on SUN4V set %gl to zero before we turn PSTATE_IE back on in %pstate. Otherwise if we take an interrupt we'll end up with corrupt register state. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-23 00:15:45 +00:00
wrpr %g0, RTRAP_PSTATE, %pstate
[SPARC64]: Refine register window trap handling. When saving and restoing trap state, do the window spill/fill handling inline so that we never trap deeper than 2 trap levels. This is important for chips like Niagara. The window fixup code is massively simplified, and many more improvements are now possible. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-04 08:10:01 +00:00
mov %l1, %g6
ldx [%g6 + TI_TASK], %g4
LOAD_PER_CPU_BASE(%g5, %g6, %g1, %g2, %g3)
call do_sparc64_fault
add %sp, PTREGS_OFF, %o0
ba,pt %xcc, rtrap
nop
user_rtt_pre_restore:
add %g1, 1, %g1
wrpr %g1, 0x0, %cwp
user_rtt_restore:
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
restore
rdpr %canrestore, %g1
wrpr %g1, 0x0, %cleanwin
retry
nop
[SPARC64]: Refine register window trap handling. When saving and restoing trap state, do the window spill/fill handling inline so that we never trap deeper than 2 trap levels. This is important for chips like Niagara. The window fixup code is massively simplified, and many more improvements are now possible. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-04 08:10:01 +00:00
kern_rtt: rdpr %canrestore, %g1
brz,pn %g1, kern_rtt_fill
nop
kern_rtt_restore:
sparc64: Prevent stack backtrace false positives on trap frames. When we fully commit to returning back to kernel mode from a trap, zero out the regs->magic value to prevent false positives during stack backtraces. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-22 04:50:01 +00:00
stw %g0, [%sp + PTREGS_OFF + PT_V9_MAGIC]
[SPARC64]: Refine register window trap handling. When saving and restoing trap state, do the window spill/fill handling inline so that we never trap deeper than 2 trap levels. This is important for chips like Niagara. The window fixup code is massively simplified, and many more improvements are now possible. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-04 08:10:01 +00:00
restore
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
retry
[SPARC64]: Refine register window trap handling. When saving and restoing trap state, do the window spill/fill handling inline so that we never trap deeper than 2 trap levels. This is important for chips like Niagara. The window fixup code is massively simplified, and many more improvements are now possible. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-02-04 08:10:01 +00:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
to_kernel:
#ifdef CONFIG_PREEMPT
ldsw [%g6 + TI_PRE_COUNT], %l5
brnz %l5, kern_fpucheck
ldx [%g6 + TI_FLAGS], %l5
andcc %l5, _TIF_NEED_RESCHED, %g0
be,pt %xcc, kern_fpucheck
[SPARC64]: Add irqtrace/stacktrace/lockdep support. Signed-off-by: David S. Miller <davem@davemloft.net>
2006-11-16 21:38:57 +00:00
nop
cmp %l4, 0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
bne,pn %xcc, kern_fpucheck
sethi %hi(PREEMPT_ACTIVE), %l6
stw %l6, [%g6 + TI_PRE_COUNT]
call schedule
nop
ba,pt %xcc, rtrap
stw %g0, [%g6 + TI_PRE_COUNT]
#endif
kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5
brz,pt %l5, rt_continue
srl %l5, 1, %o0
add %g6, TI_FPSAVED, %l6
ldub [%l6 + %o0], %l2
sub %l5, 2, %l5
add %g6, TI_GSR, %o1
andcc %l2, (FPRS_FEF|FPRS_DU), %g0
be,pt %icc, 2f
and %l2, FPRS_DL, %l6
andcc %l2, FPRS_FEF, %g0
be,pn %icc, 5f
sll %o0, 3, %o5
rd %fprs, %g1
wr %g1, FPRS_FEF, %fprs
ldx [%o1 + %o5], %g1
add %g6, TI_XFSR, %o1
sll %o0, 8, %o2
add %g6, TI_FPREGS, %o3
brz,pn %l6, 1f
add %g6, TI_FPREGS+0x40, %o4
[SPARC64]: Fix userland FPU state corruption. We need to use stricter memory barriers around the block load and store instructions we use to save and restore the FPU register file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-07 20:30:49 +00:00
membar #Sync
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
ldda [%o3 + %o2] ASI_BLK_P, %f0
ldda [%o4 + %o2] ASI_BLK_P, %f16
[SPARC64]: Fix userland FPU state corruption. We need to use stricter memory barriers around the block load and store instructions we use to save and restore the FPU register file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-07 20:30:49 +00:00
membar #Sync
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
1: andcc %l2, FPRS_DU, %g0
be,pn %icc, 1f
wr %g1, 0, %gsr
add %o2, 0x80, %o2
[SPARC64]: Fix userland FPU state corruption. We need to use stricter memory barriers around the block load and store instructions we use to save and restore the FPU register file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-07 20:30:49 +00:00
membar #Sync
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
ldda [%o3 + %o2] ASI_BLK_P, %f32
ldda [%o4 + %o2] ASI_BLK_P, %f48
1: membar #Sync
ldx [%o1 + %o5], %fsr
2: stb %l5, [%g6 + TI_FPDEPTH]
ba,pt %xcc, rt_continue
nop
5: wr %g0, FPRS_FEF, %fprs
sll %o0, 8, %o2
add %g6, TI_FPREGS+0x80, %o3
add %g6, TI_FPREGS+0xc0, %o4
[SPARC64]: Fix userland FPU state corruption. We need to use stricter memory barriers around the block load and store instructions we use to save and restore the FPU register file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-07 20:30:49 +00:00
membar #Sync
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 22:20:36 +00:00
ldda [%o3 + %o2] ASI_BLK_P, %f32
ldda [%o4 + %o2] ASI_BLK_P, %f48
membar #Sync
wr %g0, FPRS_DU, %fprs
ba,pt %xcc, rt_continue
stb %l5, [%g6 + TI_FPDEPTH]
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