mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 06:56:52 +07:00
ec687886de
Otherwise we can overflow the main stack with the function tracer enabled. Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
#ifndef _KSTACK_H
|
|
#define _KSTACK_H
|
|
|
|
#include <linux/thread_info.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/irq.h>
|
|
|
|
/* SP must be STACK_BIAS adjusted already. */
|
|
static inline bool kstack_valid(struct thread_info *tp, unsigned long sp)
|
|
{
|
|
unsigned long base = (unsigned long) tp;
|
|
|
|
/* Stack pointer must be 16-byte aligned. */
|
|
if (sp & (16UL - 1))
|
|
return false;
|
|
|
|
if (sp >= (base + sizeof(struct thread_info)) &&
|
|
sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
|
|
return true;
|
|
|
|
if (hardirq_stack[tp->cpu]) {
|
|
base = (unsigned long) hardirq_stack[tp->cpu];
|
|
if (sp >= base &&
|
|
sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
|
|
return true;
|
|
base = (unsigned long) softirq_stack[tp->cpu];
|
|
if (sp >= base &&
|
|
sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Does "regs" point to a valid pt_regs trap frame? */
|
|
static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs)
|
|
{
|
|
unsigned long base = (unsigned long) tp;
|
|
unsigned long addr = (unsigned long) regs;
|
|
|
|
if (addr >= base &&
|
|
addr <= (base + THREAD_SIZE - sizeof(*regs)))
|
|
goto check_magic;
|
|
|
|
if (hardirq_stack[tp->cpu]) {
|
|
base = (unsigned long) hardirq_stack[tp->cpu];
|
|
if (addr >= base &&
|
|
addr <= (base + THREAD_SIZE - sizeof(*regs)))
|
|
goto check_magic;
|
|
base = (unsigned long) softirq_stack[tp->cpu];
|
|
if (addr >= base &&
|
|
addr <= (base + THREAD_SIZE - sizeof(*regs)))
|
|
goto check_magic;
|
|
}
|
|
return false;
|
|
|
|
check_magic:
|
|
if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC)
|
|
return true;
|
|
return false;
|
|
|
|
}
|
|
|
|
static inline __attribute__((always_inline)) void *set_hardirq_stack(void)
|
|
{
|
|
void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
|
|
|
|
__asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
|
|
if (orig_sp < sp ||
|
|
orig_sp > (sp + THREAD_SIZE)) {
|
|
sp += THREAD_SIZE - 192 - STACK_BIAS;
|
|
__asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
|
|
}
|
|
|
|
return orig_sp;
|
|
}
|
|
|
|
static inline __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
|
|
{
|
|
__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
|
|
}
|
|
|
|
#endif /* _KSTACK_H */
|