939ef71329
Signal frames do not have a fixed format and can vary in size when a number of things change: supported XSAVE features, 32 vs. 64-bit apps, etc. Add support for a runtime method for userspace to dynamically discover how large a signal stack needs to be. Introduce a new variable, max_frame_size, and helper functions for the calculation to be used in a new user interface. Set max_frame_size to a system-wide worst-case value, instead of storing multiple app-specific values. Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Len Brown <len.brown@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: H.J. Lu <hjl.tools@gmail.com> Link: https://lkml.kernel.org/r/20210518200320.17239-3-chang.seok.bae@intel.com
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* x86 FPU signal frame handling methods:
|
|
*/
|
|
#ifndef _ASM_X86_FPU_SIGNAL_H
|
|
#define _ASM_X86_FPU_SIGNAL_H
|
|
|
|
#ifdef CONFIG_X86_64
|
|
# include <uapi/asm/sigcontext.h>
|
|
# include <asm/user32.h>
|
|
struct ksignal;
|
|
int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
|
|
compat_sigset_t *set, struct pt_regs *regs);
|
|
int ia32_setup_frame(int sig, struct ksignal *ksig,
|
|
compat_sigset_t *set, struct pt_regs *regs);
|
|
#else
|
|
# define user_i387_ia32_struct user_i387_struct
|
|
# define user32_fxsr_struct user_fxsr_struct
|
|
# define ia32_setup_frame __setup_frame
|
|
# define ia32_setup_rt_frame __setup_rt_frame
|
|
#endif
|
|
|
|
extern void convert_from_fxsr(struct user_i387_ia32_struct *env,
|
|
struct task_struct *tsk);
|
|
extern void convert_to_fxsr(struct fxregs_state *fxsave,
|
|
const struct user_i387_ia32_struct *env);
|
|
|
|
unsigned long
|
|
fpu__alloc_mathframe(unsigned long sp, int ia32_frame,
|
|
unsigned long *buf_fx, unsigned long *size);
|
|
|
|
unsigned long fpu__get_fpstate_size(void);
|
|
|
|
extern void fpu__init_prepare_fx_sw_frame(void);
|
|
|
|
#endif /* _ASM_X86_FPU_SIGNAL_H */
|