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-rw-r--r--arch/arm/kernel/head.S3
-rw-r--r--arch/arm/kernel/process.c25
-rw-r--r--arch/arm/kernel/sys_arm.c2
-rw-r--r--arch/arm/kernel/traps.c3
-rw-r--r--arch/arm/kernel/vmlinux.lds.S3
-rw-r--r--include/asm-arm/processor.h7
-rw-r--r--include/asm-arm/thread_info.h6
7 files changed, 26 insertions, 23 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 171b3e811c71..4733877296d4 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -19,6 +19,7 @@
#include <asm/procinfo.h>
#include <asm/ptrace.h>
#include <asm/constants.h>
+#include <asm/thread_info.h>
#include <asm/system.h>
#define PROCINFO_MMUFLAGS 8
@@ -131,7 +132,7 @@ __switch_data:
.long processor_id @ r4
.long __machine_arch_type @ r5
.long cr_alignment @ r6
- .long init_thread_union+8192 @ sp
+ .long init_thread_union + THREAD_START_SP @ sp
/*
* The following fragment of code is executed with the MMU on, and uses
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 26eacd3e5def..8f146a4b4752 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -256,8 +256,6 @@ static unsigned long *thread_info_head;
static unsigned int nr_thread_info;
#define EXTRA_TASK_STRUCT 4
-#define ll_alloc_task_struct() ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
-#define ll_free_task_struct(p) free_pages((unsigned long)(p),1)
struct thread_info *alloc_thread_info(struct task_struct *task)
{
@@ -274,17 +272,16 @@ struct thread_info *alloc_thread_info(struct task_struct *task)
}
if (!thread)
- thread = ll_alloc_task_struct();
+ thread = (struct thread_info *)
+ __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
-#ifdef CONFIG_MAGIC_SYSRQ
+#ifdef CONFIG_DEBUG_STACK_USAGE
/*
* The stack must be cleared if you want SYSRQ-T to
* give sensible stack usage information
*/
- if (thread) {
- char *p = (char *)thread;
- memzero(p+KERNEL_STACK_SIZE, KERNEL_STACK_SIZE);
- }
+ if (thread)
+ memzero(thread, THREAD_SIZE);
#endif
return thread;
}
@@ -297,7 +294,7 @@ void free_thread_info(struct thread_info *thread)
thread_info_head = p;
nr_thread_info += 1;
} else
- ll_free_task_struct(thread);
+ free_pages((unsigned long)thread, THREAD_SIZE_ORDER);
}
/*
@@ -350,7 +347,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
struct thread_info *thread = p->thread_info;
struct pt_regs *childregs;
- childregs = ((struct pt_regs *)((unsigned long)thread + THREAD_SIZE - 8)) - 1;
+ childregs = ((struct pt_regs *)((unsigned long)thread + THREAD_START_SP)) - 1;
*childregs = *regs;
childregs->ARM_r0 = 0;
childregs->ARM_sp = stack_start;
@@ -447,15 +444,17 @@ EXPORT_SYMBOL(kernel_thread);
unsigned long get_wchan(struct task_struct *p)
{
unsigned long fp, lr;
- unsigned long stack_page;
+ unsigned long stack_start, stack_end;
int count = 0;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
- stack_page = 4096 + (unsigned long)p->thread_info;
+ stack_start = (unsigned long)(p->thread_info + 1);
+ stack_end = ((unsigned long)p->thread_info) + THREAD_SIZE;
+
fp = thread_saved_fp(p);
do {
- if (fp < stack_page || fp > 4092+stack_page)
+ if (fp < stack_start || fp > stack_end)
return 0;
lr = pc_pointer (((unsigned long *)fp)[-1]);
if (!in_sched_functions(lr))
diff --git a/arch/arm/kernel/sys_arm.c b/arch/arm/kernel/sys_arm.c
index ef32577da304..f897ce2ccf0d 100644
--- a/arch/arm/kernel/sys_arm.c
+++ b/arch/arm/kernel/sys_arm.c
@@ -302,7 +302,7 @@ long execve(const char *filename, char **argv, char **envp)
"b ret_to_user"
:
: "r" (current_thread_info()),
- "Ir" (THREAD_SIZE - 8 - sizeof(regs)),
+ "Ir" (THREAD_START_SP - sizeof(regs)),
"r" (&regs),
"Ir" (sizeof(regs))
: "r0", "r1", "r2", "r3", "ip", "memory");
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 3a001fe5540b..8988c02119fd 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -218,7 +218,8 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
tsk->comm, tsk->pid, tsk->thread_info + 1);
if (!user_mode(regs) || in_interrupt()) {
- dump_mem("Stack: ", regs->ARM_sp, 8192+(unsigned long)tsk->thread_info);
+ dump_mem("Stack: ", regs->ARM_sp,
+ THREAD_SIZE + (unsigned long)tsk->thread_info);
dump_backtrace(regs, tsk);
dump_instr(regs);
}
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index a39c6a42d68a..ad2d66c93a5c 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -5,6 +5,7 @@
#include <asm-generic/vmlinux.lds.h>
#include <linux/config.h>
+#include <asm/thread_info.h>
OUTPUT_ARCH(arm)
ENTRY(stext)
@@ -103,7 +104,7 @@ SECTIONS
__data_loc = ALIGN(4); /* location in binary */
. = DATAADDR;
#else
- . = ALIGN(8192);
+ . = ALIGN(THREAD_SIZE);
__data_loc = .;
#endif
diff --git a/include/asm-arm/processor.h b/include/asm-arm/processor.h
index 4a9845997a75..7d4118e09054 100644
--- a/include/asm-arm/processor.h
+++ b/include/asm-arm/processor.h
@@ -23,8 +23,6 @@
#include <asm/procinfo.h>
#include <asm/types.h>
-#define KERNEL_STACK_SIZE PAGE_SIZE
-
union debug_insn {
u32 arm;
u16 thumb;
@@ -87,8 +85,9 @@ unsigned long get_wchan(struct task_struct *p);
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-#define KSTK_EIP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1019])
-#define KSTK_ESP(tsk) (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1017])
+#define KSTK_REGS(tsk) (((struct pt_regs *)(THREAD_START_SP + (unsigned long)(tsk)->thread_info)) - 1)
+#define KSTK_EIP(tsk) KSTK_REGS(tsk)->ARM_pc
+#define KSTK_ESP(tsk) KSTK_REGS(tsk)->ARM_sp
/*
* Prefetching support - only ARMv5.
diff --git a/include/asm-arm/thread_info.h b/include/asm-arm/thread_info.h
index a61618fb433c..66c585c50cf9 100644
--- a/include/asm-arm/thread_info.h
+++ b/include/asm-arm/thread_info.h
@@ -14,6 +14,10 @@
#include <asm/fpstate.h>
+#define THREAD_SIZE_ORDER 1
+#define THREAD_SIZE 8192
+#define THREAD_START_SP (THREAD_SIZE - 8)
+
#ifndef __ASSEMBLY__
struct task_struct;
@@ -77,8 +81,6 @@ struct thread_info {
#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)
-#define THREAD_SIZE 8192
-
/*
* how to get the thread information struct from C
*/
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.