3f17fed214
The PTRACE_GETREGSET API has now existed since Linux 2.6.33. The XSAVE CPU feature should also be sufficiently common to be able to rely on it. With this, define our internal FP state to be the hosts XSAVE data. Add discovery for the hosts XSAVE size and place the FP registers at the end of task_struct so that we can adjust the size at runtime. Next we can implement the regset API on top and update the signal handling as well as ptrace APIs to use them. Also switch coredump creation to use the regset API and finally set HAVE_ARCH_TRACEHOOK. This considerably improves the signal frames. Previously they might not have contained all the registers (i386) and also did not have the sizes and magic values set to the correct values to permit userspace to decode the frame. As a side effect, this will permit UML to run on hosts with newer CPU extensions (such as AMX) that need even more register state. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20241023094120.4083426-1-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
*/
|
|
|
|
#ifndef __UM_PROCESSOR_GENERIC_H
|
|
#define __UM_PROCESSOR_GENERIC_H
|
|
|
|
struct pt_regs;
|
|
|
|
struct task_struct;
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <sysdep/archsetjmp.h>
|
|
|
|
#include <linux/prefetch.h>
|
|
|
|
#include <asm/cpufeatures.h>
|
|
|
|
struct mm_struct;
|
|
|
|
struct thread_struct {
|
|
struct pt_regs *segv_regs;
|
|
struct task_struct *prev_sched;
|
|
struct arch_thread arch;
|
|
jmp_buf switch_buf;
|
|
struct {
|
|
struct {
|
|
int (*proc)(void *);
|
|
void *arg;
|
|
} thread;
|
|
} request;
|
|
|
|
/* Contains variable sized FP registers */
|
|
struct pt_regs regs;
|
|
};
|
|
|
|
#define INIT_THREAD \
|
|
{ \
|
|
.regs = EMPTY_REGS, \
|
|
.prev_sched = NULL, \
|
|
.arch = INIT_ARCH_THREAD, \
|
|
.request = { } \
|
|
}
|
|
|
|
/*
|
|
* User space process size: 3GB (default).
|
|
*/
|
|
extern unsigned long task_size;
|
|
|
|
#define TASK_SIZE (task_size)
|
|
|
|
#undef STACK_TOP
|
|
#undef STACK_TOP_MAX
|
|
|
|
extern unsigned long stacksizelim;
|
|
|
|
#define STACK_ROOM (stacksizelim)
|
|
#define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
|
|
#define STACK_TOP_MAX STACK_TOP
|
|
|
|
/* This decides where the kernel will search for a free chunk of vm
|
|
* space during mmap's.
|
|
*/
|
|
#define TASK_UNMAPPED_BASE (0x40000000)
|
|
|
|
extern void start_thread(struct pt_regs *regs, unsigned long entry,
|
|
unsigned long stack);
|
|
|
|
struct cpuinfo_um {
|
|
unsigned long loops_per_jiffy;
|
|
int ipi_pipe[2];
|
|
int cache_alignment;
|
|
union {
|
|
__u32 x86_capability[NCAPINTS + NBUGINTS];
|
|
unsigned long x86_capability_alignment;
|
|
};
|
|
};
|
|
|
|
extern struct cpuinfo_um boot_cpu_data;
|
|
|
|
#define cpu_data(cpu) boot_cpu_data
|
|
#define current_cpu_data boot_cpu_data
|
|
#define cache_line_size() (boot_cpu_data.cache_alignment)
|
|
|
|
#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
|
|
extern unsigned long __get_wchan(struct task_struct *p);
|
|
|
|
#endif
|