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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: sparc64: Fix hardirq tracing in trap return path. sparc64: Use correct pt_regs in decode_access_size() error paths. sparc64: Fix PREEMPT_ACTIVE value. sparc64: Run NMIs on the hardirq stack. sparc64: Allocate sufficient stack space in ftrace stubs. sparc: Fix forgotten kmemleak headers inclusion
This commit is contained in:
commit
ac8bf56430
7 changed files with 47 additions and 27 deletions
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@ -111,7 +111,7 @@ struct thread_info {
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#define THREAD_SHIFT PAGE_SHIFT
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#endif /* PAGE_SHIFT == 13 */
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#define PREEMPT_ACTIVE 0x4000000
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#define PREEMPT_ACTIVE 0x10000000
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/*
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* macros/functions for gaining access to the thread information structure
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@ -22,6 +22,7 @@
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#include <linux/seq_file.h>
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#include <linux/ftrace.h>
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#include <linux/irq.h>
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#include <linux/kmemleak.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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@ -46,6 +47,7 @@
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#include "entry.h"
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#include "cpumap.h"
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#include "kstack.h"
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#define NUM_IVECS (IMAP_INR + 1)
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@ -712,24 +714,6 @@ void ack_bad_irq(unsigned int virt_irq)
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void *hardirq_stack[NR_CPUS];
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void *softirq_stack[NR_CPUS];
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static __attribute__((always_inline)) void *set_hardirq_stack(void)
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{
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void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
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__asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
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if (orig_sp < sp ||
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orig_sp > (sp + THREAD_SIZE)) {
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sp += THREAD_SIZE - 192 - STACK_BIAS;
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__asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
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}
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return orig_sp;
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}
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static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
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{
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__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
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}
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void __irq_entry handler_irq(int irq, struct pt_regs *regs)
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{
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unsigned long pstate, bucket_pa;
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@ -61,4 +61,23 @@ static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *
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}
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static inline __attribute__((always_inline)) void *set_hardirq_stack(void)
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{
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void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
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__asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
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if (orig_sp < sp ||
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orig_sp > (sp + THREAD_SIZE)) {
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sp += THREAD_SIZE - 192 - STACK_BIAS;
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__asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
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}
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return orig_sp;
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}
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static inline __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
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{
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__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
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}
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#endif /* _KSTACK_H */
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@ -23,6 +23,8 @@
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#include <asm/ptrace.h>
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#include <asm/pcr.h>
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#include "kstack.h"
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/* We don't have a real NMI on sparc64, but we can fake one
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* up using profiling counter overflow interrupts and interrupt
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* levels.
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@ -92,6 +94,7 @@ static void die_nmi(const char *str, struct pt_regs *regs, int do_panic)
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notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
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{
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unsigned int sum, touched = 0;
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void *orig_sp;
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clear_softint(1 << irq);
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@ -99,6 +102,8 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
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nmi_enter();
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orig_sp = set_hardirq_stack();
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if (notify_die(DIE_NMI, "nmi", regs, 0,
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pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP)
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touched = 1;
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@ -124,6 +129,8 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
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pcr_ops->write(pcr_enable);
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}
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restore_hardirq_stack(orig_sp);
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nmi_exit();
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}
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@ -130,7 +130,17 @@ rtrap_xcall:
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nop
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call trace_hardirqs_on
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nop
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wrpr %l4, %pil
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/* Do not actually set the %pil here. We will do that
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* below after we clear PSTATE_IE in the %pstate register.
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* If we re-enable interrupts here, we can recurse down
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* the hardirq stack potentially endlessly, causing a
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* stack overflow.
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*
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* It is tempting to put this test and trace_hardirqs_on
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* call at the 'rt_continue' label, but that will not work
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* as that path hits unconditionally and we do not want to
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* execute this in NMI return paths, for example.
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*/
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#endif
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rtrap_no_irq_enable:
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andcc %l1, TSTATE_PRIV, %l3
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@ -50,7 +50,7 @@ static inline enum direction decode_direction(unsigned int insn)
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}
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/* 16 = double-word, 8 = extra-word, 4 = word, 2 = half-word */
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static inline int decode_access_size(unsigned int insn)
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static inline int decode_access_size(struct pt_regs *regs, unsigned int insn)
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{
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unsigned int tmp;
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@ -66,7 +66,7 @@ static inline int decode_access_size(unsigned int insn)
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return 2;
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else {
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printk("Impossible unaligned trap. insn=%08x\n", insn);
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die_if_kernel("Byte sized unaligned access?!?!", current_thread_info()->kregs);
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die_if_kernel("Byte sized unaligned access?!?!", regs);
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/* GCC should never warn that control reaches the end
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* of this function without returning a value because
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@ -286,7 +286,7 @@ static void log_unaligned(struct pt_regs *regs)
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asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
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{
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enum direction dir = decode_direction(insn);
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int size = decode_access_size(insn);
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int size = decode_access_size(regs, insn);
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int orig_asi, asi;
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current_thread_info()->kern_una_regs = regs;
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@ -34,7 +34,7 @@ mcount:
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cmp %g1, %g2
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be,pn %icc, 1f
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mov %i7, %g3
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save %sp, -128, %sp
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save %sp, -176, %sp
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mov %g3, %o1
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jmpl %g1, %o7
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mov %i7, %o0
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@ -56,7 +56,7 @@ mcount:
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nop
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5: mov %i7, %g2
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mov %fp, %g3
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save %sp, -128, %sp
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save %sp, -176, %sp
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mov %g2, %l0
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ba,pt %xcc, ftrace_graph_caller
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mov %g3, %l1
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@ -85,7 +85,7 @@ ftrace_caller:
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lduw [%g1 + %lo(function_trace_stop)], %g1
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brnz,pn %g1, ftrace_stub
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mov %fp, %g3
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save %sp, -128, %sp
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save %sp, -176, %sp
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mov %g2, %o1
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mov %g2, %l0
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mov %g3, %l1
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@ -120,7 +120,7 @@ ENTRY(ftrace_graph_caller)
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END(ftrace_graph_caller)
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ENTRY(return_to_handler)
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save %sp, -128, %sp
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save %sp, -176, %sp
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call ftrace_return_to_handler
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mov %fp, %o0
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jmpl %o0 + 8, %g0
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