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authorThomas Meyer <thomas@m3y3r.de>2017-07-29 17:03:23 +0200
committerRichard Weinberger <richard@nod.at>2017-09-13 22:24:38 +0200
commit6f602afda7275c24c20ba38b5b6cd4ed08561fff (patch)
tree33ee34f627f020b350fbc351eef16674588c3786 /arch/um
parent569dbb88e80deb68974ef6fdd6a13edb9d686261 (diff)
downloadlinux-6f602afda7275c24c20ba38b5b6cd4ed08561fff.tar.bz2
um: Fix FP register size for XSTATE/XSAVE
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>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/include/asm/thread_info.h3
-rw-r--r--arch/um/include/shared/os.h2
-rw-r--r--arch/um/kernel/process.c4
-rw-r--r--arch/um/os-Linux/skas/process.c17
4 files changed, 14 insertions, 12 deletions
diff --git a/arch/um/include/asm/thread_info.h b/arch/um/include/asm/thread_info.h
index 053baff03674..9300f7630d2a 100644
--- a/arch/um/include/asm/thread_info.h
+++ b/arch/um/include/asm/thread_info.h
@@ -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) \
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 574e03fc7ba2..d8ddaf9790d2 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -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));
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 2c7f721eccbc..691b83b10649 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -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,
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 819d68656673..c94c3bd70ccd 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -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);