From 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:44:59 +0000
Subject: [PATCH] gmac get mac form eeprom
---
kernel/arch/x86/kernel/unwind_frame.c | 48 +++++++++++-------------------------------------
1 files changed, 11 insertions(+), 37 deletions(-)
diff --git a/kernel/arch/x86/kernel/unwind_frame.c b/kernel/arch/x86/kernel/unwind_frame.c
index 9b9fd48..d7c44b2 100644
--- a/kernel/arch/x86/kernel/unwind_frame.c
+++ b/kernel/arch/x86/kernel/unwind_frame.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
@@ -69,26 +70,11 @@
}
}
-static size_t regs_size(struct pt_regs *regs)
-{
- /* x86_32 regs from kernel mode are two words shorter: */
- if (IS_ENABLED(CONFIG_X86_32) && !user_mode(regs))
- return sizeof(*regs) - 2*sizeof(long);
-
- return sizeof(*regs);
-}
-
static bool in_entry_code(unsigned long ip)
{
char *addr = (char *)ip;
- if (addr >= __entry_text_start && addr < __entry_text_end)
- return true;
-
- if (addr >= __irqentry_text_start && addr < __irqentry_text_end)
- return true;
-
- return false;
+ return addr >= __entry_text_start && addr < __entry_text_end;
}
static inline unsigned long *last_frame(struct unwind_state *state)
@@ -197,12 +183,6 @@
}
#endif
-#ifdef CONFIG_X86_32
-#define KERNEL_REGS_SIZE (sizeof(struct pt_regs) - 2*sizeof(long))
-#else
-#define KERNEL_REGS_SIZE (sizeof(struct pt_regs))
-#endif
-
static bool update_stack_state(struct unwind_state *state,
unsigned long *next_bp)
{
@@ -213,7 +193,7 @@
size_t len;
if (state->regs)
- prev_frame_end = (void *)state->regs + regs_size(state->regs);
+ prev_frame_end = (void *)state->regs + sizeof(*state->regs);
else
prev_frame_end = (void *)state->bp + FRAME_HEADER_SIZE;
@@ -221,7 +201,7 @@
regs = decode_frame_pointer(next_bp);
if (regs) {
frame = (unsigned long *)regs;
- len = KERNEL_REGS_SIZE;
+ len = sizeof(*regs);
state->got_irq = true;
} else {
frame = next_bp;
@@ -243,14 +223,6 @@
/* Make sure it only unwinds up and doesn't overlap the prev frame: */
if (state->orig_sp && state->stack_info.type == prev_type &&
frame < prev_frame_end)
- return false;
-
- /*
- * On 32-bit with user mode regs, make sure the last two regs are safe
- * to access:
- */
- if (IS_ENABLED(CONFIG_X86_32) && regs && user_mode(regs) &&
- !on_stack(info, frame, len + 2*sizeof(long)))
return false;
/* Move state to the next frame: */
@@ -297,13 +269,13 @@
/*
* kthreads (other than the boot CPU's idle thread) have some
* partial regs at the end of their stack which were placed
- * there by copy_thread_tls(). But the regs don't have any
+ * there by copy_thread(). But the regs don't have any
* useful information, so we can skip them.
*
* This user_mode() check is slightly broader than a PF_KTHREAD
* check because it also catches the awkward situation where a
* newly forked kthread transitions into a user task by calling
- * do_execve(), which eventually clears PF_KTHREAD.
+ * kernel_execve(), which eventually clears PF_KTHREAD.
*/
if (!user_mode(regs))
goto the_end;
@@ -366,6 +338,9 @@
if (IS_ENABLED(CONFIG_X86_32))
goto the_end;
+ if (state->task != current)
+ goto the_end;
+
if (state->regs) {
printk_deferred_once(KERN_WARNING
"WARNING: kernel stack regs at %p in %s:%d has bad 'bp' value %p\n",
@@ -411,10 +386,9 @@
* Pretend that the frame is complete and that BP points to it, but save
* the real BP so that we can use it when looking for the next frame.
*/
- if (regs && regs->ip == 0 &&
- (unsigned long *)kernel_stack_pointer(regs) >= first_frame) {
+ if (regs && regs->ip == 0 && (unsigned long *)regs->sp >= first_frame) {
state->next_bp = bp;
- bp = ((unsigned long *)kernel_stack_pointer(regs)) - 1;
+ bp = ((unsigned long *)regs->sp) - 1;
}
/* Initialize stack info and make sure the frame data is accessible: */
--
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