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parisc: Move thread_info into task struct

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This implements the CONFIG_THREAD_INFO_IN_TASK option.

With this change:
- before thread_info was part of the stack and located at the beginning of the stack
- now the thread_info struct is moved and located inside the task_struct structure
- the stack is allocated and handled like the major other platforms
- drop the cpu field of thread_info and use instead the one in task_struct

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sven Schnelle <svens@stackframe.org>
This commit is contained in:
Helge Deller 2021-10-15 10:41:03 +02:00
parent bc294838cc
commit 2214c0e772
15 changed files with 106 additions and 101 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/features/core/thread-info-in-task/arch-support.txt
View File

@ -20,7 +20,7 @@
| nds32: | ok |
| nios2: | TODO |
| openrisc: | TODO |
| parisc: | TODO |
| parisc: | ok |
| powerpc: | ok |
| riscv: | ok |
| s390: | ok |

1
arch/parisc/Kconfig
View File

@ -56,6 +56,7 @@ config PARISC
select HAVE_UNSTABLE_SCHED_CLOCK if SMP
select LEGACY_TIMER_TICK
select CPU_NO_EFFICIENT_FFS
select THREAD_INFO_IN_TASK
select NEED_DMA_MAP_STATE
select NEED_SG_DMA_LENGTH
select HAVE_ARCH_KGDB

19
arch/parisc/include/asm/current.h Normal file
View File

@ -0,0 +1,19 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_PARISC_CURRENT_H
#define _ASM_PARISC_CURRENT_H
#include <asm/special_insns.h>
#ifndef __ASSEMBLY__
struct task_struct;
static __always_inline struct task_struct *get_current(void)
{
return (struct task_struct *) mfctl(30);
}
#define current get_current()
#endif /* __ASSEMBLY__ */
#endif /* _ASM_PARISC_CURRENT_H */

2
arch/parisc/include/asm/processor.h
View File

@ -102,8 +102,6 @@ DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
#define ARCH_MIN_TASKALIGN FRAME_ALIGN
struct thread_struct {
struct pt_regs regs;
unsigned long task_size;

19
arch/parisc/include/asm/smp.h
View File

@ -34,8 +34,23 @@ extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
#endif /* !ASSEMBLY */
#define raw_smp_processor_id() (current_thread_info()->cpu)
/*
* This is particularly ugly: it appears we can't actually get the definition
* of task_struct here, but we need access to the CPU this task is running on.
* Instead of using task_struct we're using TASK_CPU which is extracted from
* asm-offsets.h by kbuild to get the current processor ID.
*
* This also needs to be safeguarded when building asm-offsets.s because at
* that time TASK_CPU is not defined yet. It could have been guarded by
* TASK_CPU itself, but we want the build to fail if TASK_CPU is missing
* when building something else than asm-offsets.s
*/
#ifdef GENERATING_ASM_OFFSETS
#define raw_smp_processor_id() (0)
#else
#include <asm/asm-offsets.h>
#define raw_smp_processor_id() (*(unsigned int *)((void *)current + TASK_CPU))
#endif
#else /* CONFIG_SMP */
static inline void smp_send_all_nop(void) { return; }

7
arch/parisc/include/asm/thread_info.h
View File

@ -9,23 +9,16 @@
#include <asm/special_insns.h>
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags; /* thread_info flags (see TIF_*) */
__u32 cpu; /* current CPU */
int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
};
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
}
/* how to get the thread information struct from C */
#define current_thread_info() ((struct thread_info *)mfctl(30))
#endif /* !__ASSEMBLY */
/* thread information allocation */

21
arch/parisc/kernel/asm-offsets.c
View File

@ -14,6 +14,8 @@
* Copyright (C) 2003 James Bottomley <jejb at parisc-linux.org>
*/
#define GENERATING_ASM_OFFSETS /* asm/smp.h */
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/thread_info.h>
@ -35,13 +37,16 @@
int main(void)
{
DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, stack));
DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
DEFINE(TASK_TI_FLAGS, offsetof(struct task_struct, thread_info.flags));
DEFINE(TASK_SIGPENDING, offsetof(struct task_struct, pending));
DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
DEFINE(TASK_MM, offsetof(struct task_struct, mm));
DEFINE(TASK_PERSONALITY, offsetof(struct task_struct, personality));
DEFINE(TASK_PID, offsetof(struct task_struct, pid));
DEFINE(TASK_STACK, offsetof(struct task_struct, stack));
#ifdef CONFIG_SMP
DEFINE(TASK_CPU, offsetof(struct task_struct, cpu));
#endif
BLANK();
DEFINE(TASK_REGS, offsetof(struct task_struct, thread.regs));
DEFINE(TASK_PT_PSW, offsetof(struct task_struct, thread.regs.gr[ 0]));
@ -129,10 +134,6 @@ int main(void)
DEFINE(TASK_PT_ISR, offsetof(struct task_struct, thread.regs.isr));
DEFINE(TASK_PT_IOR, offsetof(struct task_struct, thread.regs.ior));
BLANK();
DEFINE(TASK_SZ, sizeof(struct task_struct));
/* TASK_SZ_ALGN includes space for a stack frame. */
DEFINE(TASK_SZ_ALGN, align_frame(sizeof(struct task_struct), FRAME_ALIGN));
BLANK();
DEFINE(PT_PSW, offsetof(struct pt_regs, gr[ 0]));
DEFINE(PT_GR1, offsetof(struct pt_regs, gr[ 1]));
DEFINE(PT_GR2, offsetof(struct pt_regs, gr[ 2]));
@ -217,17 +218,11 @@ int main(void)
DEFINE(PT_IIR, offsetof(struct pt_regs, iir));
DEFINE(PT_ISR, offsetof(struct pt_regs, isr));
DEFINE(PT_IOR, offsetof(struct pt_regs, ior));
DEFINE(PT_SIZE, sizeof(struct pt_regs));
/* PT_SZ_ALGN includes space for a stack frame. */
DEFINE(PT_SZ_ALGN, align_frame(sizeof(struct pt_regs), FRAME_ALIGN));
BLANK();
DEFINE(TI_TASK, offsetof(struct thread_info, task));
DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
DEFINE(TI_PRE_COUNT, offsetof(struct thread_info, preempt_count));
DEFINE(THREAD_SZ, sizeof(struct thread_info));
/* THREAD_SZ_ALGN includes space for a stack frame. */
DEFINE(THREAD_SZ_ALGN, align_frame(sizeof(struct thread_info), FRAME_ALIGN));
DEFINE(TI_PRE_COUNT, offsetof(struct task_struct, thread_info.preempt_count));
BLANK();
DEFINE(ICACHE_BASE, offsetof(struct pdc_cache_info, ic_base));
DEFINE(ICACHE_STRIDE, offsetof(struct pdc_cache_info, ic_stride));

50
arch/parisc/kernel/entry.S
View File

@ -63,8 +63,8 @@
* Need to set up a kernel stack, so call the
* get_stack_use_cr30 macro to set up a pointer
* to the pt_regs structure contained within the
* task pointer pointed to by cr30. Set the stack
* pointer to point to the end of the task structure.
* task pointer pointed to by cr30. Load the stack
* pointer from the task structure.
*
* Note that we use shadowed registers for temps until
* we can save %r26 and %r29. %r26 is used to preserve
@ -76,8 +76,6 @@
* or handle_interruption. %r29 is used to hold a pointer
* the register save area, and once again, it needs to
* be a non-shadowed register so that it survives the rfir.
*
* N.B. TASK_SZ_ALGN and PT_SZ_ALGN include space for a stack frame.
*/
.macro get_stack_use_cr30
@ -86,12 +84,11 @@
copy %r30, %r17
mfctl %cr30, %r1
ldo THREAD_SZ_ALGN(%r1), %r30
mtsp %r0,%sr7
tophys %r1,%r9 /* task_struct */
LDREG TASK_STACK(%r9),%r30
ldo PT_SZ_ALGN(%r30),%r30
mtsp %r0,%sr7 /* clear sr7 after kernel stack was set! */
mtsp %r16,%sr3
tophys %r1,%r9
LDREG TI_TASK(%r9), %r1 /* thread_info -> task_struct */
tophys %r1,%r9
ldo TASK_REGS(%r9),%r9
STREG %r17,PT_GR30(%r9)
STREG %r29,PT_GR29(%r9)
@ -733,7 +730,7 @@ ENTRY(ret_from_kernel_thread)
BL schedule_tail, %r2
nop
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
mfctl %cr30,%r1 /* task_struct */
LDREG TASK_PT_GR25(%r1), %r26
#ifdef CONFIG_64BIT
LDREG TASK_PT_GR27(%r1), %r27
@ -764,7 +761,6 @@ ENTRY_CFI(_switch_to)
STREG %r30, TASK_PT_KSP(%r26)
LDREG TASK_PT_KSP(%r25), %r30
LDREG TASK_THREAD_INFO(%r25), %r25
bv %r0(%r2)
mtctl %r25,%cr30
@ -795,8 +791,7 @@ ENDPROC_CFI(_switch_to)
.align PAGE_SIZE
ENTRY_CFI(syscall_exit_rfi)
mfctl %cr30,%r16
LDREG TI_TASK(%r16), %r16 /* thread_info -> task_struct */
mfctl %cr30,%r16 /* task_struct */
ldo TASK_REGS(%r16),%r16
/* Force iaoq to userspace, as the user has had access to our current
* context via sigcontext. Also Filter the PSW for the same reason.
@ -841,14 +836,14 @@ ENTRY_CFI(syscall_exit_rfi)
ENTRY(intr_return)
/* check for reschedule */
mfctl %cr30,%r1
LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
LDREG TASK_TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
bb,<,n %r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */
.import do_notify_resume,code
intr_check_sig:
/* As above */
mfctl %cr30,%r1
LDREG TI_FLAGS(%r1),%r19
LDREG TASK_TI_FLAGS(%r1),%r19
ldi (_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r20
and,COND(<>) %r19, %r20, %r0
b,n intr_restore /* skip past if we've nothing to do */
@ -1692,7 +1687,7 @@ dtlb_fault:
.macro fork_like name
ENTRY_CFI(sys_\name\()_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
mfctl %cr30,%r1
ldo TASK_REGS(%r1),%r1
reg_save %r1
mfctl %cr27, %r28
@ -1712,7 +1707,7 @@ ENTRY(child_return)
BL schedule_tail, %r2
nop
finish_child_return:
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
mfctl %cr30,%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
LDREG PT_CR27(%r1), %r3
@ -1723,7 +1718,7 @@ finish_child_return:
END(child_return)
ENTRY_CFI(sys_rt_sigreturn_wrapper)
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
mfctl %cr30,%r26
ldo TASK_REGS(%r26),%r26 /* get pt regs */
/* Don't save regs, we are going to restore them from sigcontext. */
STREG %r2, -RP_OFFSET(%r30)
@ -1740,7 +1735,7 @@ ENTRY_CFI(sys_rt_sigreturn_wrapper)
LDREG -RP_OFFSET(%r30), %r2
/* FIXME: I think we need to restore a few more things here. */
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
mfctl %cr30,%r1
ldo TASK_REGS(%r1),%r1 /* get pt regs */
reg_restore %r1
@ -1759,9 +1754,7 @@ ENTRY(syscall_exit)
*/
/* save return value now */
mfctl %cr30, %r1
LDREG TI_TASK(%r1),%r1
STREG %r28,TASK_PT_GR28(%r1)
/* Seems to me that dp could be wrong here, if the syscall involved
@ -1772,13 +1765,14 @@ ENTRY(syscall_exit)
syscall_check_resched:
/* check for reschedule */
LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* long */
mfctl %cr30,%r19
LDREG TASK_TI_FLAGS(%r19),%r19 /* long */
bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */
.import do_signal,code
syscall_check_sig:
LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19
mfctl %cr30,%r19
LDREG TASK_TI_FLAGS(%r19),%r19
ldi (_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r26
and,COND(<>) %r19, %r26, %r0
b,n syscall_restore /* skip past if we've nothing to do */
@ -1789,7 +1783,7 @@ syscall_do_signal:
* consistent with all the relevant state of the process
* before the syscall. We need to verify this.
*/
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
mfctl %cr30,%r1
ldo TASK_REGS(%r1), %r26 /* struct pt_regs *regs */
reg_save %r26
@ -1800,17 +1794,17 @@ syscall_do_signal:
BL do_notify_resume,%r2
ldi 1, %r25 /* long in_syscall = 1 */
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
mfctl %cr30,%r1
ldo TASK_REGS(%r1), %r20 /* reload pt_regs */
reg_restore %r20
b,n syscall_check_sig
syscall_restore:
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
mfctl %cr30,%r1
/* Are we being ptraced? */
LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19
LDREG TASK_TI_FLAGS(%r1),%r19
ldi _TIF_SYSCALL_TRACE_MASK,%r2
and,COND(=) %r19,%r2,%r0
b,n syscall_restore_rfi

40
arch/parisc/kernel/head.S
View File

@ -35,7 +35,8 @@ END(boot_args)
__HEAD
.align 4
.import init_thread_union,data
.import init_task,data
.import init_stack,data
.import fault_vector_20,code /* IVA parisc 2.0 32 bit */
#ifndef CONFIG_64BIT
.import fault_vector_11,code /* IVA parisc 1.1 32 bit */
@ -123,12 +124,12 @@ $pgt_fill_loop:
load32 start_parisc,%r11
/* And the initial task pointer */
load32 init_thread_union,%r6
load32 init_task,%r6
mtctl %r6,%cr30
/* And the stack pointer too */
ldo THREAD_SZ_ALGN(%r6),%sp
load32 init_stack,%sp
tophys_r1 %sp
#if defined(CONFIG_64BIT) && defined(CONFIG_FUNCTION_TRACER)
.import _mcount,data
/* initialize mcount FPTR */
@ -186,12 +187,11 @@ common_stext:
#endif /*CONFIG_SMP*/
#ifdef CONFIG_64BIT
tophys_r1 %sp
mfctl %cr30,%r6 /* PCX-W2 firmware bug */
tophys_r1 %r6
/* Save the rfi target address */
ldd TI_TASK-THREAD_SZ_ALGN(%sp), %r10
tophys_r1 %r10
std %r11, TASK_PT_GR11(%r10)
STREG %r11, TASK_PT_GR11(%r6)
/* Switch to wide mode Superdome doesn't support narrow PDC
** calls.
*/
@ -206,7 +206,6 @@ common_stext:
** Someday, palo might not do this for the Monarch either.
*/
2:
mfctl %cr30,%r6 /* PCX-W2 firmware bug */
ldo PDC_PSW(%r0),%arg0 /* 21 */
ldo PDC_PSW_SET_DEFAULTS(%r0),%arg1 /* 2 */
@ -216,13 +215,9 @@ common_stext:
copy %r0,%arg3
stext_pdc_ret:
LDREG TASK_PT_GR11(%r6), %r11
tovirt_r1 %r6
mtctl %r6,%cr30 /* restore task thread info */
/* restore rfi target address*/
ldd TI_TASK-THREAD_SZ_ALGN(%sp), %r10
tophys_r1 %r10
ldd TASK_PT_GR11(%r10), %r11
tovirt_r1 %sp
#endif
/* PARANOID: clear user scratch/user space SR's */
@ -287,7 +282,9 @@ aligned_rfi:
load32 KERNEL_PSW,%r10
mtctl %r10,%ipsw
tovirt_r1 %sp
/* Jump through hyperspace to Virt Mode */
rfi
nop
@ -343,12 +340,13 @@ smp_slave_stext:
#endif
/* Initialize the SP - monarch sets up smp_init_current_idle_task */
load32 PA(smp_init_current_idle_task),%sp
LDREG 0(%sp),%sp /* load task address */
load32 PA(smp_init_current_idle_task),%r6
LDREG 0(%r6),%r6
mtctl %r6,%cr30
tophys_r1 %r6
LDREG TASK_STACK(%r6),%sp
tophys_r1 %sp
LDREG TASK_THREAD_INFO(%sp),%sp
mtctl %sp,%cr30 /* store in cr30 */
ldo THREAD_SZ_ALGN(%sp),%sp
ldo FRAME_SIZE(%sp),%sp
/* point CPU to kernel page tables */
load32 PA(swapper_pg_dir),%r4

6
arch/parisc/kernel/irq.c
View File

@ -15,6 +15,7 @@
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/types.h>
#include <linux/sched/task_stack.h>
#include <asm/io.h>
#include <asm/softirq_stack.h>
@ -399,8 +400,7 @@ 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 stack_start = (unsigned long) task_stack_page(current);
unsigned long sp = regs->gr[30];
unsigned long stack_usage;
unsigned int *last_usage;
@ -476,7 +476,7 @@ static void execute_on_irq_stack(void *func, unsigned long param1)
union_ptr = &per_cpu(irq_stack_union, smp_processor_id());
irq_stack = (unsigned long) &union_ptr->stack;
irq_stack = ALIGN(irq_stack + sizeof(irq_stack_union.slock),
64); /* align for stack frame usage */
FRAME_ALIGN); /* align for stack frame usage */
/* We may be called recursive. If we are already using the irq stack,
* just continue to use it. Use spinlocks to serialize

4
arch/parisc/kernel/process.c
View File

@ -205,7 +205,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
/* Must exit via ret_from_kernel_thread in order
* to call schedule_tail()
*/
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
cregs->ksp = (unsigned long) stack + FRAME_SIZE + PT_SZ_ALGN;
cregs->kpc = (unsigned long) &ret_from_kernel_thread;
/*
* Copy function and argument to be called from
@ -228,7 +228,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
if (likely(usp))
cregs->gr[30] = usp;
}
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
cregs->ksp = (unsigned long) stack + FRAME_SIZE;
cregs->kpc = (unsigned long) &child_return;
/* Setup thread TLS area */

2
arch/parisc/kernel/smp.c
View File

@ -324,7 +324,7 @@ int smp_boot_one_cpu(int cpuid, struct task_struct *idle)
const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid);
long timeout;
task_thread_info(idle)->cpu = cpuid;
idle->cpu = cpuid;
/* Let _start know what logical CPU we're booting
** (offset into init_tasks[],cpu_data[])

22
arch/parisc/kernel/syscall.S
View File

@ -139,9 +139,9 @@ linux_gateway_entry:
xor %r1,%r30,%r30 /* ye olde xor trick */
xor %r1,%r30,%r1
xor %r1,%r30,%r30
ldo THREAD_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */
LDREG TASK_STACK(%r30),%r30 /* set up kernel stack */
ldo FRAME_SIZE(%r30),%r30
/* N.B.: It is critical that we don't set sr7 to 0 until r30
* contains a valid kernel stack pointer. It is also
* critical that we don't start using the kernel stack
@ -152,7 +152,6 @@ linux_gateway_entry:
ssm PSW_SM_I, %r0 /* enable interrupts */
STREGM %r1,FRAME_SIZE(%r30) /* save r1 (usp) here for now */
mfctl %cr30,%r1 /* get task ptr in %r1 */
LDREG TI_TASK(%r1),%r1
/* Save some registers for sigcontext and potential task
switch (see entry.S for the details of which ones are
@ -207,7 +206,7 @@ linux_gateway_entry:
/* Are we being ptraced? */
mfctl %cr30, %r1
LDREG TI_FLAGS(%r1),%r1
LDREG TASK_TI_FLAGS(%r1),%r1
ldi _TIF_SYSCALL_TRACE_MASK, %r19
and,COND(=) %r1, %r19, %r0
b,n .Ltracesys
@ -272,8 +271,7 @@ tracesys:
* C bit set, a non-straced syscall entry results in C and D clear
* in the saved PSW.
*/
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
LDREG TI_TASK(%r1), %r1
mfctl %cr30,%r1 /* get task ptr */
ssm 0,%r2
STREG %r2,TASK_PT_PSW(%r1) /* Lower 8 bits only!! */
mfsp %sr0,%r2
@ -327,8 +325,7 @@ tracesys_next:
*/
copy %ret0,%r20
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
LDREG TI_TASK(%r1), %r1
mfctl %cr30,%r1 /* get task ptr */
LDREG TASK_PT_GR28(%r1), %r28 /* Restore return value */
LDREG TASK_PT_GR26(%r1), %r26 /* Restore the users args */
LDREG TASK_PT_GR25(%r1), %r25
@ -385,16 +382,14 @@ tracesys_next:
makes a direct call to syscall_trace. */
tracesys_exit:
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
LDREG TI_TASK(%r1), %r1
mfctl %cr30,%r1 /* get task ptr */
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif
ldo TASK_REGS(%r1),%r26
BL do_syscall_trace_exit,%r2
STREG %r28,TASK_PT_GR28(%r1) /* save return value now */
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
LDREG TI_TASK(%r1), %r1
mfctl %cr30,%r1 /* get task ptr */
LDREG TASK_PT_GR28(%r1), %r28 /* Restore return val. */
ldil L%syscall_exit,%r1
@ -407,8 +402,7 @@ tracesys_exit:
ldo R%tracesys_sigexit(%r2),%r2
tracesys_sigexit:
ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */
LDREG TI_TASK(%r1), %r1
mfctl %cr30,%r1 /* get task ptr */
#ifdef CONFIG_64BIT
ldo -16(%r30),%r29 /* Reference param save area */
#endif

2
arch/parisc/kernel/traps.c
View File

@ -144,7 +144,7 @@ void show_regs(struct pt_regs *regs)
printk("%s IIR: %08lx ISR: " RFMT " IOR: " RFMT "\n",
level, regs->iir, regs->isr, regs->ior);
printk("%s CPU: %8d CR30: " RFMT " CR31: " RFMT "\n",
level, current_thread_info()->cpu, cr30, cr31);
level, task_cpu(current), cr30, cr31);
printk("%s ORIG_R28: " RFMT "\n", level, regs->orig_r28);
if (user) {

10
arch/parisc/kernel/unwind.c
View File

@ -14,6 +14,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sort.h>
#include <linux/sched/task_stack.h>
#include <linux/uaccess.h>
#include <asm/assembly.h>
@ -299,12 +300,9 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
info->prev_sp = sp - 64;
info->prev_ip = 0;
/* The stack is at the end inside the thread_union
* struct. If we reach data, we have reached the
* beginning of the stack and should stop unwinding. */
if (info->prev_sp >= (unsigned long) task_thread_info(info->t) &&
info->prev_sp < ((unsigned long) task_thread_info(info->t)
+ THREAD_SZ_ALGN)) {
/* Check if stack is inside kernel stack area */
if ((info->prev_sp - (unsigned long) task_stack_page(info->t))
>= THREAD_SIZE) {
info->prev_sp = 0;
break;
}