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-rw-r--r--arch/parisc/kernel/cache.c11
-rw-r--r--arch/parisc/kernel/entry.S68
-rw-r--r--arch/parisc/kernel/hpmc.S4
-rw-r--r--arch/parisc/kernel/irq.c104
-rw-r--r--arch/parisc/kernel/pacache.S33
-rw-r--r--arch/parisc/kernel/parisc_ksyms.c2
-rw-r--r--arch/parisc/kernel/pdc_chassis.c47
-rw-r--r--arch/parisc/kernel/process.c22
-rw-r--r--arch/parisc/kernel/setup.c2
-rw-r--r--arch/parisc/kernel/smp.c16
-rw-r--r--arch/parisc/kernel/sys_parisc32.c41
-rw-r--r--arch/parisc/kernel/syscall.S34
-rw-r--r--arch/parisc/kernel/syscall_table.S8
-rw-r--r--arch/parisc/kernel/traps.c34
-rw-r--r--arch/parisc/kernel/vmlinux.lds.S2
15 files changed, 267 insertions, 161 deletions
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 4b12890642eb..65fb4cbc3a0f 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -421,14 +421,11 @@ void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
/* Note: purge_tlb_entries can be called at startup with
no context. */
- /* Disable preemption while we play with %sr1. */
- preempt_disable();
- mtsp(mm->context, 1);
purge_tlb_start(flags);
+ mtsp(mm->context, 1);
pdtlb(addr);
pitlb(addr);
purge_tlb_end(flags);
- preempt_enable();
}
EXPORT_SYMBOL(purge_tlb_entries);
@@ -609,7 +606,7 @@ void clear_user_highpage(struct page *page, unsigned long vaddr)
/* Clear using TMPALIAS region. The page doesn't need to
be flushed but the kernel mapping needs to be purged. */
- vto = kmap_atomic(page, KM_USER0);
+ vto = kmap_atomic(page);
/* The PA-RISC 2.0 Architecture book states on page F-6:
"Before a write-capable translation is enabled, *all*
@@ -644,8 +641,8 @@ void copy_user_highpage(struct page *to, struct page *from,
the `to' page must be flushed in copy_user_page_asm since
it can be used to bring in executable code. */
- vfrom = kmap_atomic(from, KM_USER0);
- vto = kmap_atomic(to, KM_USER1);
+ vfrom = kmap_atomic(from);
+ vto = kmap_atomic(to);
purge_kernel_dcache_page_asm((unsigned long)vto);
purge_tlb_start(flags);
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index f33201bf8977..4bb96ad9b0b1 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -400,7 +400,15 @@
#if PT_NLEVELS == 3
extru \va,31-ASM_PMD_SHIFT,ASM_BITS_PER_PMD,\index
#else
+# if defined(CONFIG_64BIT)
+ extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
+ #else
+ # if PAGE_SIZE > 4096
+ extru \va,31-ASM_PGDIR_SHIFT,32-ASM_PGDIR_SHIFT,\index
+ # else
extru \va,31-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
+ # endif
+# endif
#endif
dep %r0,31,PAGE_SHIFT,\pmd /* clear offset */
copy %r0,\pte
@@ -615,7 +623,7 @@
.text
- .align PAGE_SIZE
+ .align 4096
ENTRY(fault_vector_20)
/* First vector is invalid (0) */
@@ -825,11 +833,6 @@ ENTRY(syscall_exit_rfi)
STREG %r19,PT_SR7(%r16)
intr_return:
- /* NOTE: Need to enable interrupts incase we schedule. */
- ssm PSW_SM_I, %r0
-
-intr_check_resched:
-
/* check for reschedule */
mfctl %cr30,%r1
LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
@@ -856,6 +859,11 @@ intr_check_sig:
LDREG PT_IASQ1(%r16), %r20
cmpib,COND(=),n 0,%r20,intr_restore /* backward */
+ /* NOTE: We need to enable interrupts if we have to deliver
+ * signals. We used to do this earlier but it caused kernel
+ * stack overflows. */
+ ssm PSW_SM_I, %r0
+
copy %r0, %r25 /* long in_syscall = 0 */
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
@@ -907,6 +915,10 @@ intr_do_resched:
cmpib,COND(=) 0, %r20, intr_do_preempt
nop
+ /* NOTE: We need to enable interrupts if we schedule. We used
+ * to do this earlier but it caused kernel stack overflows. */
+ ssm PSW_SM_I, %r0
+
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
@@ -1694,7 +1706,8 @@ ENTRY(sys_\name\()_wrapper)
ldo TASK_REGS(%r1),%r1
reg_save %r1
mfctl %cr27, %r28
- b sys_\name
+ ldil L%sys_\name, %r31
+ be R%sys_\name(%sr4,%r31)
STREG %r28, PT_CR27(%r1)
ENDPROC(sys_\name\()_wrapper)
.endm
@@ -1997,6 +2010,47 @@ ftrace_stub:
ENDPROC(return_to_handler)
#endif /* CONFIG_FUNCTION_TRACER */
+#ifdef CONFIG_IRQSTACKS
+/* void call_on_stack(unsigned long param1, void *func,
+ unsigned long new_stack) */
+ENTRY(call_on_stack)
+ copy %sp, %r1
+
+ /* Regarding the HPPA calling conventions for function pointers,
+ we assume the PIC register is not changed across call. For
+ CONFIG_64BIT, the argument pointer is left to point at the
+ argument region allocated for the call to call_on_stack. */
+# ifdef CONFIG_64BIT
+ /* Switch to new stack. We allocate two 128 byte frames. */
+ ldo 256(%arg2), %sp
+ /* Save previous stack pointer and return pointer in frame marker */
+ STREG %rp, -144(%sp)
+ /* Calls always use function descriptor */
+ LDREG 16(%arg1), %arg1
+ bve,l (%arg1), %rp
+ STREG %r1, -136(%sp)
+ LDREG -144(%sp), %rp
+ bve (%rp)
+ LDREG -136(%sp), %sp
+# else
+ /* Switch to new stack. We allocate two 64 byte frames. */
+ ldo 128(%arg2), %sp
+ /* Save previous stack pointer and return pointer in frame marker */
+ STREG %r1, -68(%sp)
+ STREG %rp, -84(%sp)
+ /* Calls use function descriptor if PLABEL bit is set */
+ bb,>=,n %arg1, 30, 1f
+ depwi 0,31,2, %arg1
+ LDREG 0(%arg1), %arg1
+1:
+ be,l 0(%sr4,%arg1), %sr0, %r31
+ copy %r31, %rp
+ LDREG -84(%sp), %rp
+ bv (%rp)
+ LDREG -68(%sp), %sp
+# endif /* CONFIG_64BIT */
+ENDPROC(call_on_stack)
+#endif /* CONFIG_IRQSTACKS */
get_register:
/*
diff --git a/arch/parisc/kernel/hpmc.S b/arch/parisc/kernel/hpmc.S
index 5595a2f31181..e158b6fbf1b4 100644
--- a/arch/parisc/kernel/hpmc.S
+++ b/arch/parisc/kernel/hpmc.S
@@ -55,13 +55,13 @@
* IODC requires 7K byte stack. That leaves 1K byte for os_hpmc.
*/
- .align PAGE_SIZE
+ .align 4096
hpmc_stack:
.block 16384
#define HPMC_IODC_BUF_SIZE 0x8000
- .align PAGE_SIZE
+ .align 4096
hpmc_iodc_buf:
.block HPMC_IODC_BUF_SIZE
diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index 8094d3ed3b64..e255db0bb761 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -152,6 +152,39 @@ static struct irq_chip cpu_interrupt_type = {
.irq_retrigger = NULL,
};
+DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
+#define irq_stats(x) (&per_cpu(irq_stat, x))
+
+/*
+ * /proc/interrupts printing for arch specific interrupts
+ */
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+ int j;
+
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+ seq_printf(p, "%*s: ", prec, "STK");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);
+ seq_printf(p, " Kernel stack usage\n");
+#endif
+#ifdef CONFIG_SMP
+ seq_printf(p, "%*s: ", prec, "RES");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
+ seq_printf(p, " Rescheduling interrupts\n");
+ seq_printf(p, "%*s: ", prec, "CAL");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
+ seq_printf(p, " Function call interrupts\n");
+#endif
+ seq_printf(p, "%*s: ", prec, "TLB");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
+ seq_printf(p, " TLB shootdowns\n");
+ return 0;
+}
+
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j;
@@ -219,6 +252,9 @@ int show_interrupts(struct seq_file *p, void *v)
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
+ if (i == NR_IRQS)
+ arch_show_interrupts(p, 3);
+
return 0;
}
@@ -330,6 +366,66 @@ static inline int eirr_to_irq(unsigned long eirr)
return (BITS_PER_LONG - bit) + TIMER_IRQ;
}
+int sysctl_panic_on_stackoverflow = 1;
+
+static inline void stack_overflow_check(struct pt_regs *regs)
+{
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+ #define STACK_MARGIN (256*6)
+
+ /* Our stack starts directly behind the thread_info struct. */
+ unsigned long stack_start = (unsigned long) current_thread_info();
+ unsigned long sp = regs->gr[30];
+ unsigned long stack_usage;
+ unsigned int *last_usage;
+
+ /* if sr7 != 0, we interrupted a userspace process which we do not want
+ * to check for stack overflow. We will only check the kernel stack. */
+ if (regs->sr[7])
+ return;
+
+ /* calculate kernel stack usage */
+ stack_usage = sp - stack_start;
+ last_usage = &per_cpu(irq_stat.kernel_stack_usage, smp_processor_id());
+
+ if (unlikely(stack_usage > *last_usage))
+ *last_usage = stack_usage;
+
+ if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))
+ return;
+
+ pr_emerg("stackcheck: %s will most likely overflow kernel stack "
+ "(sp:%lx, stk bottom-top:%lx-%lx)\n",
+ current->comm, sp, stack_start, stack_start + THREAD_SIZE);
+
+ if (sysctl_panic_on_stackoverflow)
+ panic("low stack detected by irq handler - check messages\n");
+#endif
+}
+
+#ifdef CONFIG_IRQSTACKS
+DEFINE_PER_CPU(union irq_stack_union, irq_stack_union);
+
+static void execute_on_irq_stack(void *func, unsigned long param1)
+{
+ unsigned long *irq_stack_start;
+ unsigned long irq_stack;
+ int cpu = smp_processor_id();
+
+ irq_stack_start = &per_cpu(irq_stack_union, cpu).stack[0];
+ irq_stack = (unsigned long) irq_stack_start;
+ irq_stack = ALIGN(irq_stack, 16); /* align for stack frame usage */
+
+ BUG_ON(*irq_stack_start); /* report bug if we were called recursive. */
+ *irq_stack_start = 1;
+
+ /* This is where we switch to the IRQ stack. */
+ call_on_stack(param1, func, irq_stack);
+
+ *irq_stack_start = 0;
+}
+#endif /* CONFIG_IRQSTACKS */
+
/* ONLY called from entry.S:intr_extint() */
void do_cpu_irq_mask(struct pt_regs *regs)
{
@@ -364,7 +460,13 @@ void do_cpu_irq_mask(struct pt_regs *regs)
goto set_out;
}
#endif
+ stack_overflow_check(regs);
+
+#ifdef CONFIG_IRQSTACKS
+ execute_on_irq_stack(&generic_handle_irq, irq);
+#else
generic_handle_irq(irq);
+#endif /* CONFIG_IRQSTACKS */
out:
irq_exit();
@@ -420,6 +522,4 @@ void __init init_IRQ(void)
cpu_eiem = EIEM_MASK(TIMER_IRQ);
#endif
set_eiem(cpu_eiem); /* EIEM : enable all external intr */
-
}
-
diff --git a/arch/parisc/kernel/pacache.S b/arch/parisc/kernel/pacache.S
index 312b48422a56..5e1de6072be5 100644
--- a/arch/parisc/kernel/pacache.S
+++ b/arch/parisc/kernel/pacache.S
@@ -563,6 +563,15 @@ ENDPROC(copy_page_asm)
* %r23 physical page (shifted for tlb insert) of "from" translation
*/
+ /* Drop prot bits and convert to page addr for iitlbt and idtlbt */
+ #define PAGE_ADD_SHIFT (PAGE_SHIFT-12)
+ .macro convert_phys_for_tlb_insert20 phys
+ extrd,u \phys, 56-PAGE_ADD_SHIFT, 32-PAGE_ADD_SHIFT, \phys
+#if _PAGE_SIZE_ENCODING_DEFAULT
+ depdi _PAGE_SIZE_ENCODING_DEFAULT, 63, (63-58), \phys
+#endif
+ .endm
+
/*
* We can't do this since copy_user_page is used to bring in
* file data that might have instructions. Since the data would
@@ -589,15 +598,14 @@ ENTRY(copy_user_page_asm)
sub %r25, %r1, %r23
ldil L%(TMPALIAS_MAP_START), %r28
- /* FIXME for different page sizes != 4k */
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
#endif
- extrd,u %r26,56,32, %r26 /* convert phys addr to tlb insert format */
- extrd,u %r23,56,32, %r23 /* convert phys addr to tlb insert format */
+ convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
+ convert_phys_for_tlb_insert20 %r23 /* convert phys addr to tlb insert format */
depd %r24,63,22, %r28 /* Form aliased virtual address 'to' */
- depdi 0, 63,12, %r28 /* Clear any offset bits */
+ depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
copy %r28, %r29
depdi 1, 41,1, %r29 /* Form aliased virtual address 'from' */
#else
@@ -747,11 +755,10 @@ ENTRY(clear_user_page_asm)
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
- /* FIXME: page size dependend */
#endif
- extrd,u %r26, 56,32, %r26 /* convert phys addr to tlb insert format */
+ convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
- depdi 0, 63,12, %r28 /* Clear any offset bits */
+ depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
#else
extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
@@ -832,11 +839,10 @@ ENTRY(flush_dcache_page_asm)
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
- /* FIXME: page size dependend */
#endif
- extrd,u %r26, 56,32, %r26 /* convert phys addr to tlb insert format */
+ convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
- depdi 0, 63,12, %r28 /* Clear any offset bits */
+ depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
#else
extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
@@ -909,11 +915,10 @@ ENTRY(flush_icache_page_asm)
#ifdef CONFIG_64BIT
#if (TMPALIAS_MAP_START >= 0x80000000)
depdi 0, 31,32, %r28 /* clear any sign extension */
- /* FIXME: page size dependend */
#endif
- extrd,u %r26, 56,32, %r26 /* convert phys addr to tlb insert format */
+ convert_phys_for_tlb_insert20 %r26 /* convert phys addr to tlb insert format */
depd %r25, 63,22, %r28 /* Form aliased virtual address 'to' */
- depdi 0, 63,12, %r28 /* Clear any offset bits */
+ depdi 0, 63,PAGE_SHIFT, %r28 /* Clear any offset bits */
#else
extrw,u %r26, 24,25, %r26 /* convert phys addr to tlb insert format */
depw %r25, 31,22, %r28 /* Form aliased virtual address 'to' */
@@ -959,7 +964,7 @@ ENTRY(flush_icache_page_asm)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
fic,m %r1(%sr4,%r28)
- cmpb,COND(<<) %r28, %r25,1b
+ cmpb,COND(<<) %r28, %r25,1b
fic,m %r1(%sr4,%r28)
sync
diff --git a/arch/parisc/kernel/parisc_ksyms.c b/arch/parisc/kernel/parisc_ksyms.c
index 6795dc6c995f..568b2c61ea02 100644
--- a/arch/parisc/kernel/parisc_ksyms.c
+++ b/arch/parisc/kernel/parisc_ksyms.c
@@ -120,11 +120,13 @@ extern void __ashrdi3(void);
extern void __ashldi3(void);
extern void __lshrdi3(void);
extern void __muldi3(void);
+extern void __ucmpdi2(void);
EXPORT_SYMBOL(__ashrdi3);
EXPORT_SYMBOL(__ashldi3);
EXPORT_SYMBOL(__lshrdi3);
EXPORT_SYMBOL(__muldi3);
+EXPORT_SYMBOL(__ucmpdi2);
asmlinkage void * __canonicalize_funcptr_for_compare(void *);
EXPORT_SYMBOL(__canonicalize_funcptr_for_compare);
diff --git a/arch/parisc/kernel/pdc_chassis.c b/arch/parisc/kernel/pdc_chassis.c
index d47ba1aa8253..3e04242de5a7 100644
--- a/arch/parisc/kernel/pdc_chassis.c
+++ b/arch/parisc/kernel/pdc_chassis.c
@@ -30,11 +30,13 @@
#endif
#include <linux/init.h>
+#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/cache.h>
#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
#include <asm/pdc_chassis.h>
#include <asm/processor.h>
@@ -244,38 +246,38 @@ int pdc_chassis_send_status(int message)
#ifdef CONFIG_PDC_CHASSIS_WARN
#ifdef CONFIG_PROC_FS
-static int pdc_chassis_warn_pread(char *page, char **start, off_t off,
- int count, int *eof, void *data)
+static int pdc_chassis_warn_show(struct seq_file *m, void *v)
{
- char *out = page;
- int len, ret;
unsigned long warn;
u32 warnreg;
- ret = pdc_chassis_warn(&warn);
- if (ret != PDC_OK)
+ if (pdc_chassis_warn(&warn) != PDC_OK)
return -EIO;
warnreg = (warn & 0xFFFFFFFF);
if ((warnreg >> 24) & 0xFF)
- out += sprintf(out, "Chassis component failure! (eg fan or PSU): 0x%.2x\n", ((warnreg >> 24) & 0xFF));
-
- out += sprintf(out, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK");
- out += sprintf(out, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK");
- out += sprintf(out, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK");
-
- len = out - page - off;
- if (len < count) {
- *eof = 1;
- if (len <= 0) return 0;
- } else {
- len = count;
- }
- *start = page + off;
- return len;
+ seq_printf(m, "Chassis component failure! (eg fan or PSU): 0x%.2x\n",
+ (warnreg >> 24) & 0xFF);
+
+ seq_printf(m, "Battery: %s\n", (warnreg & 0x04) ? "Low!" : "OK");
+ seq_printf(m, "Temp low: %s\n", (warnreg & 0x02) ? "Exceeded!" : "OK");
+ seq_printf(m, "Temp mid: %s\n", (warnreg & 0x01) ? "Exceeded!" : "OK");
+ return 0;
+}
+
+static int pdc_chassis_warn_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, pdc_chassis_warn_show, NULL);
}
+static const struct file_operations pdc_chassis_warn_fops = {
+ .open = pdc_chassis_warn_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static int __init pdc_chassis_create_procfs(void)
{
unsigned long test;
@@ -290,8 +292,7 @@ static int __init pdc_chassis_create_procfs(void)
printk(KERN_INFO "Enabling PDC chassis warnings support v%s\n",
PDC_CHASSIS_VER);
- create_proc_read_entry("chassis", 0400, NULL, pdc_chassis_warn_pread,
- NULL);
+ proc_create("chassis", 0400, NULL, &pdc_chassis_warn_fops);
return 0;
}
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index d13507246c5d..55f92b614182 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -59,28 +59,6 @@
#include <asm/unwind.h>
#include <asm/sections.h>
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void cpu_idle(void)
-{
- set_thread_flag(TIF_POLLING_NRFLAG);
-
- /* endless idle loop with no priority at all */
- while (1) {
- rcu_idle_enter();
- while (!need_resched())
- barrier();
- rcu_idle_exit();
- schedule_preempt_disabled();
- check_pgt_cache();
- }
-}
-
-
#define COMMAND_GLOBAL F_EXTEND(0xfffe0030)
#define CMD_RESET 5 /* reset any module */
diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c
index a3328c2616b0..76b63e726a53 100644
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c
@@ -129,6 +129,8 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_INFO "The 32-bit Kernel has started...\n");
#endif
+ printk(KERN_INFO "Default page size is %dKB.\n", (int)(PAGE_SIZE / 1024));
+
pdc_console_init();
#ifdef CONFIG_64BIT
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 6266730efd61..e3614fb343e5 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -127,7 +127,7 @@ ipi_interrupt(int irq, void *dev_id)
unsigned long flags;
/* Count this now; we may make a call that never returns. */
- p->ipi_count++;
+ inc_irq_stat(irq_call_count);
mb(); /* Order interrupt and bit testing. */
@@ -155,6 +155,7 @@ ipi_interrupt(int irq, void *dev_id)
case IPI_RESCHEDULE:
smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);
+ inc_irq_stat(irq_resched_count);
scheduler_ipi();
break;
@@ -263,17 +264,6 @@ void arch_send_call_function_single_ipi(int cpu)
}
/*
- * Flush all other CPU's tlb and then mine. Do this with on_each_cpu()
- * as we want to ensure all TLB's flushed before proceeding.
- */
-
-void
-smp_flush_tlb_all(void)
-{
- on_each_cpu(flush_tlb_all_local, NULL, 1);
-}
-
-/*
* Called by secondaries to update state and initialize CPU registers.
*/
static void __init
@@ -329,7 +319,7 @@ void __init smp_callin(void)
local_irq_enable(); /* Interrupts have been off until now */
- cpu_idle(); /* Wait for timer to schedule some work */
+ cpu_startup_entry(CPUHP_ONLINE);
/* NOTREACHED */
panic("smp_callin() AAAAaaaaahhhh....\n");
diff --git a/arch/parisc/kernel/sys_parisc32.c b/arch/parisc/kernel/sys_parisc32.c
index 051c8b90231f..f517e08e7f0d 100644
--- a/arch/parisc/kernel/sys_parisc32.c
+++ b/arch/parisc/kernel/sys_parisc32.c
@@ -60,47 +60,6 @@ asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
return -ENOSYS;
}
-/* Note: it is necessary to treat out_fd and in_fd as unsigned ints, with the
- * corresponding cast to a signed int to insure that the proper conversion
- * (sign extension) between the register representation of a signed int (msr in
- * 32-bit mode) and the register representation of a signed int (msr in 64-bit
- * mode) is performed.
- */
-asmlinkage long sys32_sendfile(u32 out_fd, u32 in_fd,
- compat_off_t __user *offset, compat_size_t count)
-{
- return compat_sys_sendfile((int)out_fd, (int)in_fd, offset, count);
-}
-
-asmlinkage long sys32_sendfile64(u32 out_fd, u32 in_fd,
- compat_loff_t __user *offset, compat_size_t count)
-{
- return sys_sendfile64((int)out_fd, (int)in_fd,
- (loff_t __user *)offset, count);
-}
-
-asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
-{
- union semun u;
-
- if (cmd == SETVAL) {
- /* Ugh. arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
- * The int should be in the first 4, but our argument
- * frobbing has left it in the last 4.
- */
- u.val = *((int *)&arg + 1);
- return sys_semctl (semid, semnum, cmd, u);
- }
- return sys_semctl (semid, semnum, cmd, arg);
-}
-
-long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
- size_t len)
-{
- return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
- buf, len);
-}
-
asmlinkage long compat_sys_fanotify_mark(int fan_fd, int flags, u32 mask_hi,
u32 mask_lo, int fd,
const char __user *pathname)
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 5e055240f00b..e767ab733e32 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -1,12 +1,35 @@
/*
* Linux/PA-RISC Project (http://www.parisc-linux.org/)
*
- * System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai>
+ * System call entry code / Linux gateway page
+ * Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai>
* Licensed under the GNU GPL.
* thanks to Philipp Rumpf, Mike Shaver and various others
* sorry about the wall, puffin..
*/
+/*
+How does the Linux gateway page on PA-RISC work?
+------------------------------------------------
+The Linux gateway page on PA-RISC is "special".
+It actually has PAGE_GATEWAY bits set (this is linux terminology; in parisc
+terminology it's Execute, promote to PL0) in the page map. So anything
+executing on this page executes with kernel level privilege (there's more to it
+than that: to have this happen, you also have to use a branch with a ,gate
+completer to activate the privilege promotion). The upshot is that everything
+that runs on the gateway page runs at kernel privilege but with the current
+user process address space (although you have access to kernel space via %sr2).
+For the 0x100 syscall entry, we redo the space registers to point to the kernel
+address space (preserving the user address space in %sr3), move to wide mode if
+required, save the user registers and branch into the kernel syscall entry
+point. For all the other functions, we execute at kernel privilege but don't
+flip address spaces. The basic upshot of this is that these code snippets are
+executed atomically (because the kernel can't be pre-empted) and they may
+perform architecturally forbidden (to PL3) operations (like setting control
+registers).
+*/
+
+
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/errno.h>
@@ -15,6 +38,7 @@
#include <asm/thread_info.h>
#include <asm/assembly.h>
#include <asm/processor.h>
+#include <asm/cache.h>
#include <linux/linkage.h>
@@ -643,7 +667,7 @@ ENTRY(end_linux_gateway_page)
.section .rodata,"a"
- .align PAGE_SIZE
+ .align 8
/* Light-weight-syscall table */
/* Start of lws table. */
ENTRY(lws_table)
@@ -652,13 +676,13 @@ ENTRY(lws_table)
END(lws_table)
/* End of lws table */
- .align PAGE_SIZE
+ .align 8
ENTRY(sys_call_table)
#include "syscall_table.S"
END(sys_call_table)
#ifdef CONFIG_64BIT
- .align PAGE_SIZE
+ .align 8
ENTRY(sys_call_table64)
#define SYSCALL_TABLE_64BIT
#include "syscall_table.S"
@@ -674,7 +698,7 @@ END(sys_call_table64)
with ldcw.
*/
.section .data
- .align PAGE_SIZE
+ .align L1_CACHE_BYTES
ENTRY(lws_lock_start)
/* lws locks */
.rept 16
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index f57dc137b8dd..0c9107285e66 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -198,7 +198,7 @@
ENTRY_SAME(madvise)
ENTRY_SAME(clone_wrapper) /* 120 */
ENTRY_SAME(setdomainname)
- ENTRY_DIFF(sendfile)
+ ENTRY_COMP(sendfile)
/* struct sockaddr... */
ENTRY_SAME(recvfrom)
/* struct timex contains longs */
@@ -282,7 +282,7 @@
ENTRY_COMP(recvmsg)
ENTRY_SAME(semop) /* 185 */
ENTRY_SAME(semget)
- ENTRY_DIFF(semctl)
+ ENTRY_COMP(semctl)
ENTRY_COMP(msgsnd)
ENTRY_COMP(msgrcv)
ENTRY_SAME(msgget) /* 190 */
@@ -304,7 +304,7 @@
ENTRY_SAME(gettid)
ENTRY_OURS(readahead)
ENTRY_SAME(tkill)
- ENTRY_DIFF(sendfile64)
+ ENTRY_COMP(sendfile64)
ENTRY_COMP(futex) /* 210 */
ENTRY_COMP(sched_setaffinity)
ENTRY_COMP(sched_getaffinity)
@@ -318,7 +318,7 @@
ENTRY_SAME(alloc_hugepages) /* 220 */
ENTRY_SAME(free_hugepages)
ENTRY_SAME(exit_group)
- ENTRY_DIFF(lookup_dcookie)
+ ENTRY_COMP(lookup_dcookie)
ENTRY_SAME(epoll_create)
ENTRY_SAME(epoll_ctl) /* 225 */
ENTRY_SAME(epoll_wait)
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index aeb8f8f2c07a..fe41a98043bb 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -126,6 +126,8 @@ void show_regs(struct pt_regs *regs)
user = user_mode(regs);
level = user ? KERN_DEBUG : KERN_CRIT;
+ show_regs_print_info(level);
+
print_gr(level, regs);
for (i = 0; i < 8; i += 4)
@@ -158,14 +160,6 @@ void show_regs(struct pt_regs *regs)
}
}
-
-void dump_stack(void)
-{
- show_stack(NULL, NULL);
-}
-
-EXPORT_SYMBOL(dump_stack);
-
static void do_show_stack(struct unwind_frame_info *info)
{
int i = 1;
@@ -528,10 +522,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
*/
if (((unsigned long)regs->iaoq[0] & 3) &&
((unsigned long)regs->iasq[0] != (unsigned long)regs->sr[7])) {
- /* Kill the user process later */
- regs->iaoq[0] = 0 | 3;
+ /* Kill the user process later */
+ regs->iaoq[0] = 0 | 3;
regs->iaoq[1] = regs->iaoq[0] + 4;
- regs->iasq[0] = regs->iasq[1] = regs->sr[7];
+ regs->iasq[0] = regs->iasq[1] = regs->sr[7];
regs->gr[0] &= ~PSW_B;
return;
}
@@ -547,8 +541,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
/* set up a new led state on systems shipped with a LED State panel */
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_HPMC);
-
- parisc_terminate("High Priority Machine Check (HPMC)",
+
+ parisc_terminate("High Priority Machine Check (HPMC)",
regs, code, 0);
/* NOT REACHED */
@@ -590,13 +584,13 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
/* Break instruction trap */
handle_break(regs);
return;
-
+
case 10:
/* Privileged operation trap */
die_if_kernel("Privileged operation", regs, code);
si.si_code = ILL_PRVOPC;
goto give_sigill;
-
+
case 11:
/* Privileged register trap */
if ((regs->iir & 0xffdfffe0) == 0x034008a0) {
@@ -640,7 +634,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
if(user_mode(regs)){
si.si_signo = SIGFPE;
/* Set to zero, and let the userspace app figure it out from
- the insn pointed to by si_addr */
+ the insn pointed to by si_addr */
si.si_code = 0;
si.si_addr = (void __user *) regs->iaoq[0];
force_sig_info(SIGFPE, &si, current);
@@ -654,7 +648,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
die_if_kernel("Floating point exception", regs, 0); /* quiet */
handle_fpe(regs);
return;
-
+
case 15:
/* Data TLB miss fault/Data page fault */
/* Fall through */
@@ -666,15 +660,15 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
case 17:
/* Non-access data TLB miss fault/Non-access data page fault */
/* FIXME:
- Still need to add slow path emulation code here!
- If the insn used a non-shadow register, then the tlb
+ Still need to add slow path emulation code here!
+ If the insn used a non-shadow register, then the tlb
handlers could not have their side-effect (e.g. probe
writing to a target register) emulated since rfir would
erase the changes to said register. Instead we have to
setup everything, call this function we are in, and emulate
by hand. Technically we need to emulate:
fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw
- */
+ */
fault_address = regs->ior;
fault_space = regs->isr;
break;
diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index 64a999882e4f..4bb095a2f6fc 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -95,7 +95,7 @@ SECTIONS
NOTES
/* Data */
- RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
+ RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, PAGE_SIZE)
/* PA-RISC locks requires 16-byte alignment */
. = ALIGN(16);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.