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um: Fix FP register size for XSTATE/XSAVE

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Hard code max size. Taken from
https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gdb/common/x86-xstate.h

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Thomas Meyer 2017-07-29 17:03:23 +02:00 committed by Richard Weinberger
parent 569dbb88e8
commit 6f602afda7
6 changed files with 27 additions and 19 deletions
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3
arch/um/include/asm/thread_info.h
View File

@ -11,6 +11,7 @@
#include <asm/types.h>
#include <asm/page.h>
#include <asm/segment.h>
#include <sysdep/ptrace_user.h>
struct thread_info {
struct task_struct *task; /* main task structure */
@ -22,6 +23,8 @@ struct thread_info {
0-0xBFFFFFFF for user
0-0xFFFFFFFF for kernel */
struct thread_info *real_thread; /* Points to non-IRQ stack */
unsigned long aux_fp_regs[FP_SIZE]; /* auxiliary fp_regs to save/restore
them out-of-band */
};
#define INIT_THREAD_INFO(tsk) \

2
arch/um/include/shared/os.h
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@ -278,7 +278,7 @@ extern int protect(struct mm_id * mm_idp, unsigned long addr,
extern int is_skas_winch(int pid, int fd, void *data);
extern int start_userspace(unsigned long stub_stack);
extern int copy_context_skas0(unsigned long stack, int pid);
extern void userspace(struct uml_pt_regs *regs);
extern void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs);
extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
unsigned long stack);
extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));

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

@ -131,7 +131,7 @@ void new_thread_handler(void)
* callback returns only if the kernel thread execs a process
*/
n = fn(arg);
userspace(&current->thread.regs.regs);
userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
}
/* Called magically, see new_thread_handler above */
@ -150,7 +150,7 @@ void fork_handler(void)
current->thread.prev_sched = NULL;
userspace(&current->thread.regs.regs);
userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
}
int copy_thread(unsigned long clone_flags, unsigned long sp,

17
arch/um/os-Linux/skas/process.c
View File

@ -88,12 +88,11 @@ bad_wait:
extern unsigned long current_stub_stack(void);
static void get_skas_faultinfo(int pid, struct faultinfo *fi)
static void get_skas_faultinfo(int pid, struct faultinfo *fi, unsigned long *aux_fp_regs)
{
int err;
unsigned long fpregs[FP_SIZE];
err = get_fp_registers(pid, fpregs);
err = get_fp_registers(pid, aux_fp_regs);
if (err < 0) {
printk(UM_KERN_ERR "save_fp_registers returned %d\n",
err);
@ -113,7 +112,7 @@ static void get_skas_faultinfo(int pid, struct faultinfo *fi)
*/
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
err = put_fp_registers(pid, fpregs);
err = put_fp_registers(pid, aux_fp_regs);
if (err < 0) {
printk(UM_KERN_ERR "put_fp_registers returned %d\n",
err);
@ -121,9 +120,9 @@ static void get_skas_faultinfo(int pid, struct faultinfo *fi)
}
}
static void handle_segv(int pid, struct uml_pt_regs * regs)
static void handle_segv(int pid, struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
{
get_skas_faultinfo(pid, &regs->faultinfo);
get_skas_faultinfo(pid, &regs->faultinfo, aux_fp_regs);
segv(regs->faultinfo, 0, 1, NULL);
}
@ -332,7 +331,7 @@ int start_userspace(unsigned long stub_stack)
return err;
}
void userspace(struct uml_pt_regs *regs)
void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
{
int err, status, op, pid = userspace_pid[0];
/* To prevent races if using_sysemu changes under us.*/
@ -407,11 +406,11 @@ void userspace(struct uml_pt_regs *regs)
case SIGSEGV:
if (PTRACE_FULL_FAULTINFO) {
get_skas_faultinfo(pid,
&regs->faultinfo);
&regs->faultinfo, aux_fp_regs);
(*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
regs);
}
else handle_segv(pid, regs);
else handle_segv(pid, regs, aux_fp_regs);
break;
case SIGTRAP + 0x80:
handle_trap(pid, regs, local_using_sysemu);

18
arch/x86/um/os-Linux/registers.c
View File

@ -5,6 +5,7 @@
*/
#include <errno.h>
#include <stdlib.h>
#include <sys/ptrace.h>
#ifdef __i386__
#include <sys/user.h>
@ -31,7 +32,7 @@ int save_fp_registers(int pid, unsigned long *fp_regs)
if (have_xstate_support) {
iov.iov_base = fp_regs;
iov.iov_len = sizeof(struct _xstate);
iov.iov_len = FP_SIZE * sizeof(unsigned long);
if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
@ -51,10 +52,9 @@ int restore_fp_registers(int pid, unsigned long *fp_regs)
{
#ifdef PTRACE_SETREGSET
struct iovec iov;
if (have_xstate_support) {
iov.iov_base = fp_regs;
iov.iov_len = sizeof(struct _xstate);
iov.iov_len = FP_SIZE * sizeof(unsigned long);
if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
return -errno;
return 0;
@ -125,13 +125,19 @@ int put_fp_registers(int pid, unsigned long *regs)
void arch_init_registers(int pid)
{
#ifdef PTRACE_GETREGSET
struct _xstate fp_regs;
void * fp_regs;
struct iovec iov;
iov.iov_base = &fp_regs;
iov.iov_len = sizeof(struct _xstate);
fp_regs = malloc(FP_SIZE * sizeof(unsigned long));
if(fp_regs == NULL)
return;
iov.iov_base = fp_regs;
iov.iov_len = FP_SIZE * sizeof(unsigned long);
if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) == 0)
have_xstate_support = 1;
free(fp_regs);
#endif
}
#endif

2
arch/x86/um/user-offsets.c
View File

@ -51,7 +51,7 @@ void foo(void)
DEFINE(HOST_ORIG_AX, ORIG_EAX);
#else
#ifdef FP_XSTATE_MAGIC1
DEFINE(HOST_FP_SIZE, sizeof(struct _xstate) / sizeof(unsigned long));
DEFINE_LONGS(HOST_FP_SIZE, 2696);
#else
DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
#endif