MN10300: Save frame pointer in thread_info struct rather than global var

Save the current exception frame pointer in the thread_info struct rather than in a global variable as the latter makes SMP tricky, especially when preemption is also enabled. This also replaces __frame with current_frame() and rearranges header file inclusions to make it all compile.

David Howells committed 16 years ago

Commit 7c7fcf71 parent a5e03ca15 files · +76 −146Browse files

Unified · Split

15 files

arch/mn10300/include/asm/frame.inc +13 −43
arch/mn10300/include/asm/irq_regs.h +5 −1
arch/mn10300/include/asm/pgalloc.h +0 −1
arch/mn10300/include/asm/processor.h +18 −28
arch/mn10300/include/asm/ptrace.h +0 −6
arch/mn10300/include/asm/smp.h +0 −13
arch/mn10300/include/asm/thread_info.h +14 −4
arch/mn10300/include/asm/uaccess.h +1 −3
arch/mn10300/kernel/asm-offsets.c +1 −1
arch/mn10300/kernel/mn10300-watchdog.c +1 −1
arch/mn10300/kernel/process.c +11 −9
arch/mn10300/kernel/signal.c +11 −9
arch/mn10300/kernel/switch_to.S +0 −18
arch/mn10300/kernel/traps.c +0 −8
mm/maccess.c +1 −1

arch/mn10300/include/asm/frame.inc+13−43

@@ -18,9 +18,7 @@ · 17 unmodified lines
18	18	#ifndef __ASM_OFFSETS_H__
19	19	#include <asm/asm-offsets.h>
20	20	#endif
21		−#ifdef CONFIG_SMP
22		−#include <proc/smp-regs.h>
23		−#endif
	21	+#include <asm/thread_info.h>
24	22
25	23	#define pi break
26	24
@@ -40,27 +38,15 @@ · 13 unmodified lines
40	38	movm [d2,d3,a2,a3,exreg0,exreg1,exother],(sp)
41	39	mov sp,fp # FRAME pointer in A3
42	40	add -12,sp # allow for calls to be made
43		−#ifdef CONFIG_SMP
44		−#ifdef CONFIG_PREEMPT /* FIXME */
45		− mov epsw,d2
46		− and ~EPSW_IE,epsw
47		−#endif
48		− mov (CPUID),a0
49		− add a0,a0
50		− add a0,a0
51		− mov (___frame,a0),a1
52		− mov a1,(REG_NEXT,fp)
53		− mov fp,(___frame,a0)
54		−#ifdef CONFIG_PREEMPT /* FIXME */
55		− mov d2,epsw
56		−#endif
57		−#else /* CONFIG_SMP */
58		− mov (__frame),a1
59		− mov a1,(REG_NEXT,fp)
60		− mov fp,(__frame)
61		−#endif /* CONFIG_SMP */
62	41
63		− and ~EPSW_FE,epsw # disable the FPU inside the kernel
	42	+ # push the exception frame onto the front of the list
	43	+ GET_THREAD_INFO a1
	44	+ mov (TI_frame,a1),a0
	45	+ mov a0,(REG_NEXT,fp)
	46	+ mov fp,(TI_frame,a1)
	47	+
	48	+ # disable the FPU inside the kernel
	49	+ and ~EPSW_FE,epsw
64	50
65	51	# we may be holding current in E2
66	52	#ifdef CONFIG_MN10300_CURRENT_IN_E2
@@ -76,27 +62,11 @@ · 9 unmodified lines
76	62	.macro RESTORE_ALL
77	63	# peel back the stack to the calling frame
78	64	# - this permits execve() to discard extra frames due to kernel syscalls
79		−#ifdef CONFIG_SMP
80		−#ifdef CONFIG_PREEMPT /* FIXME */
81		− mov epsw,d2
82		− and ~EPSW_IE,epsw
83		−#endif
84		− mov (CPUID),a0
85		− add a0,a0
86		− add a0,a0
87		− mov (___frame,a0),fp
88		− mov fp,sp
89		− mov (REG_NEXT,fp),d0 # userspace has regs->next == 0
90		− mov d0,(___frame,a0)
91		−#ifdef CONFIG_PREEMPT /* FIXME */
92		− mov d2,epsw
93		−#endif
94		−#else /* CONFIG_SMP */
95		− mov (__frame),fp
	65	+ GET_THREAD_INFO a0
	66	+ mov (TI_frame,a0),fp
96	67	mov fp,sp
97		− mov (REG_NEXT,fp),d0 # userspace has regs->next == 0
98		− mov d0,(__frame)
99		−#endif /* CONFIG_SMP */
	68	+ mov (REG_NEXT,fp),d0
	69	+ mov d0,(TI_frame,a0) # userspace has regs->next == 0
100	70
101	71	#ifndef CONFIG_MN10300_USING_JTAG
102	72	mov (REG_EPSW,fp),d0

arch/mn10300/include/asm/irq_regs.h+5−1

@@ -18,7 +18,11 @@ · 17 unmodified lines
18	18	#define ARCH_HAS_OWN_IRQ_REGS
19	19
20	20	#ifndef __ASSEMBLY__
21		−#define get_irq_regs() (__frame)
	21	+static inline __attribute__((const))
	22	+struct pt_regs *get_irq_regs(void)
	23	+{
	24	+ return current_frame();
	25	+}
22	26	#endif
23	27
24	28	#endif /* _ASM_IRQ_REGS_H */

arch/mn10300/include/asm/pgalloc.h+0−1

@@ -11,7 +11,6 @@ · 10 unmodified lines
11	11	#ifndef _ASM_PGALLOC_H
12	12	#define _ASM_PGALLOC_H
13	13
14		−#include <asm/processor.h>
15	14	#include <asm/page.h>
16	15	#include <linux/threads.h>
17	16	#include <linux/mm.h> /* for struct page */

arch/mn10300/include/asm/processor.h+18−28

@@ -13,10 +13,13 @@ · 12 unmodified lines
13	13	#ifndef _ASM_PROCESSOR_H
14	14	#define _ASM_PROCESSOR_H
15	15
	16	+#include <linux/threads.h>
	17	+#include <linux/thread_info.h>
16	18	#include <asm/page.h>
17	19	#include <asm/ptrace.h>
18	20	#include <asm/cpu-regs.h>
19		−#include <linux/threads.h>
	21	+#include <asm/uaccess.h>
	22	+#include <asm/current.h>
20	23
21	24	/* Forward declaration, a strange C thing */
22	25	struct task_struct;
@@ -83,10 +86,6 @@ extern void dodgy_tsc(void); · 60 unmodified lines
83	86	*/
84	87	#define TASK_UNMAPPED_BASE 0x30000000
85	88
86		−typedef struct {
87		− unsigned long seg;
88		−} mm_segment_t;
89		−
90	89	struct fpu_state_struct {
91	90	unsigned long fs[32]; /* fpu registers */
92	91	unsigned long fpcr; /* fpu control register */
@@ -99,7 +98,6 @@ struct thread_struct { · 6 unmodified lines
99	98	unsigned long a3; /* kernel FP */
100	99	unsigned long wchan;
101	100	unsigned long usp;
102		− struct pt_regs *frame;
103	101	unsigned long fpu_flags;
104	102	#define THREAD_USING_FPU 0x00000001 /* T if this task is using the FPU */
105	103	#define THREAD_HAS_FPU 0x00000002 /* T if this task owns the FPU right now */
@@ -113,7 +111,6 @@ struct thread_struct { · 7 unmodified lines
113	111	.sp = 0, \
114	112	.a3 = 0, \
115	113	.wchan = 0, \
116		− .frame = NULL, \
117	114	}
118	115
119	116	#define INIT_MMAP \
@@ -125,27 +122,20 @@ struct thread_struct { · 5 unmodified lines
125	122	* - need to discard the frame stacked by the kernel thread invoking the execve
126	123	* syscall (see RESTORE_ALL macro)
127	124	*/
128		−#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT) /* FIXME */
129		−#define start_thread(regs, new_pc, new_sp) do { \
130		− int cpu; \
131		− preempt_disable(); \
132		− cpu = CPUID; \
133		− set_fs(USER_DS); \
134		− ___frame[cpu] = current->thread.uregs; \
135		− ___frame[cpu]->epsw = EPSW_nSL \| EPSW_IE \| EPSW_IM;\
136		− ___frame[cpu]->pc = new_pc; \
137		− ___frame[cpu]->sp = new_sp; \
138		− preempt_enable(); \
139		−} while (0)
140		−#else /* CONFIG_SMP && CONFIG_PREEMPT */
141		−#define start_thread(regs, new_pc, new_sp) do { \
142		− set_fs(USER_DS); \
143		− __frame = current->thread.uregs; \
144		− __frame->epsw = EPSW_nSL \| EPSW_IE \| EPSW_IM; \
145		− __frame->pc = new_pc; \
146		− __frame->sp = new_sp; \
147		−} while (0)
148		−#endif /* CONFIG_SMP && CONFIG_PREEMPT */
	125	+static inline void start_thread(struct pt_regs *regs,
	126	+ unsigned long new_pc, unsigned long new_sp)
	127	+{
	128	+ struct thread_info *ti = current_thread_info();
	129	+ struct pt_regs *frame0;
	130	+ set_fs(USER_DS);
	131	+
	132	+ frame0 = thread_info_to_uregs(ti);
	133	+ frame0->epsw = EPSW_nSL \| EPSW_IE \| EPSW_IM;
	134	+ frame0->pc = new_pc;
	135	+ frame0->sp = new_sp;
	136	+ ti->frame = frame0;
	137	+}
	138	+
149	139
150	140	/* Free all resources held by a thread. */
151	141	extern void release_thread(struct task_struct *);

arch/mn10300/include/asm/ptrace.h+0−6

@@ -86,12 +86,6 @@ struct pt_regs { · 85 unmodified lines
86	86
87	87	#ifdef __KERNEL__
88	88
89		−#ifdef CONFIG_SMP
90		−extern struct pt_regs ___frame[]; / current frame pointer */
91		−#else
92		−extern struct pt_regs __frame; / current frame pointer */
93		−#endif
94		−
95	89	#define user_mode(regs) (((regs)->epsw & EPSW_nSL) == EPSW_nSL)
96	90	#define instruction_pointer(regs) ((regs)->pc)
97	91	#define user_stack_pointer(regs) ((regs)->sp)

arch/mn10300/include/asm/smp.h+0−13

@@ -93,19 +93,6 @@ extern int __cpu_disable(void); · 92 unmodified lines
93	93	extern void __cpu_die(unsigned int cpu);
94	94	#endif /* CONFIG_HOTPLUG_CPU */
95	95
96		−#ifdef CONFIG_PREEMPT /* FIXME */
97		−#define __frame \
98		− ({ \
99		− struct pt_regs *f; \
100		− preempt_disable(); \
101		− f = ___frame[CPUID]; \
102		− preempt_enable(); \
103		− f; \
104		− })
105		−#else
106		−#define __frame ___frame[CPUID]
107		−#endif
108		−
109	96	#endif /* __ASSEMBLY__ */
110	97	#else /* CONFIG_SMP */
111	98	#ifndef __ASSEMBLY__

arch/mn10300/include/asm/thread_info.h+14−4

@@ -16,10 +16,6 @@ · 15 unmodified lines
16	16
17	17	#include <asm/page.h>
18	18
19		−#ifndef __ASSEMBLY__
20		−#include <asm/processor.h>
21		−#endif
22		−
23	19	#define PREEMPT_ACTIVE 0x10000000
24	20
25	21	#ifdef CONFIG_4KSTACKS
@@ -38,10 +34,14 @@ · 12 unmodified lines
38	34	* must also be changed
39	35	*/
40	36	#ifndef __ASSEMBLY__
	37	+typedef struct {
	38	+ unsigned long seg;
	39	+} mm_segment_t;
41	40
42	41	struct thread_info {
43	42	struct task_struct task; / main task structure */
44	43	struct exec_domain exec_domain; / execution domain */
	44	+ struct pt_regs frame; / current exception frame */
45	45	unsigned long flags; /* low level flags */
46	46	__u32 cpu; /* current CPU */
47	47	__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
@@ -55,6 +55,10 @@ struct thread_info { · 7 unmodified lines
55	55	__u8 supervisor_stack[0];
56	56	};
57	57
	58	+#define thread_info_to_uregs(ti) \
	59	+ ((struct pt_regs *) \
	60	+ ((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs)))
	61	+
58	62	#else /* !__ASSEMBLY__ */
59	63
60	64	#ifndef __ASM_OFFSETS_H__
@@ -102,6 +106,12 @@ struct thread_info *current_thread_info(void) · 41 unmodified lines
102	106	return ti;
103	107	}
104	108
	109	+static inline __attribute__((const))
	110	+struct pt_regs *current_frame(void)
	111	+{
	112	+ return current_thread_info()->frame;
	113	+}
	114	+
105	115	/* how to get the current stack pointer from C */
106	116	static inline unsigned long current_stack_pointer(void)
107	117	{

arch/mn10300/include/asm/uaccess.h+1−3

@@ -14,9 +14,8 @@ · 13 unmodified lines
14	14	/*
15	15	* User space memory access functions
16	16	*/
17		−#include <linux/sched.h>
	17	+#include <linux/thread_info.h>
18	18	#include <asm/page.h>
19		−#include <asm/pgtable.h>
20	19	#include <asm/errno.h>
21	20
22	21	#define VERIFY_READ 0
@@ -29,7 +28,6 @@ · 6 unmodified lines
29	28	*
30	29	* For historical reasons, these macros are grossly misnamed.
31	30	*/
32		−
33	31	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
34	32
35	33	#define KERNEL_XDS MAKE_MM_SEG(0xBFFFFFFF)

arch/mn10300/kernel/asm-offsets.c+1−1

@@ -23,6 +23,7 @@ void foo(void) · 22 unmodified lines
23	23
24	24	OFFSET(TI_task, thread_info, task);
25	25	OFFSET(TI_exec_domain, thread_info, exec_domain);
	26	+ OFFSET(TI_frame, thread_info, frame);
26	27	OFFSET(TI_flags, thread_info, flags);
27	28	OFFSET(TI_cpu, thread_info, cpu);
28	29	OFFSET(TI_preempt_count, thread_info, preempt_count);
@@ -66,7 +67,6 @@ void foo(void) · 37 unmodified lines
66	67	OFFSET(THREAD_SP, thread_struct, sp);
67	68	OFFSET(THREAD_A3, thread_struct, a3);
68	69	OFFSET(THREAD_USP, thread_struct, usp);
69		− OFFSET(THREAD_FRAME, thread_struct, frame);
70	70	#ifdef CONFIG_FPU
71	71	OFFSET(THREAD_FPU_FLAGS, thread_struct, fpu_flags);
72	72	OFFSET(THREAD_FPU_STATE, thread_struct, fpu_state);

arch/mn10300/kernel/mn10300-watchdog.c+1−1

@@ -122,7 +122,7 @@ void __init watchdog_go(void) · 121 unmodified lines
122	122	static void watchdog_dump_register(void *dummy)
123	123	{
124	124	printk(KERN_ERR "--- Register Dump (CPU%d) ---\n", CPUID);
125		− show_registers(__frame);
	125	+ show_registers(current_frame());
126	126	}
127	127	#endif
128	128

arch/mn10300/kernel/process.c+11−9

@@ -228,6 +228,7 @@ int copy_thread(unsigned long clone_flags, · 227 unmodified lines
228	228	unsigned long c_usp, unsigned long ustk_size,
229	229	struct task_struct p, struct pt_regs kregs)
230	230	{
	231	+ struct thread_info *ti = task_thread_info(p);
231	232	struct pt_regs c_uregs, c_kregs, *uregs;
232	233	unsigned long c_ksp;
233	234
@@ -248,7 +249,7 @@ int copy_thread(unsigned long clone_flags, · 14 unmodified lines
248	249
249	250	/* the new TLS pointer is passed in as arg #5 to sys_clone() */
250	251	if (clone_flags & CLONE_SETTLS)
251		− c_uregs->e2 = __frame->d3;
	252	+ c_uregs->e2 = current_frame()->d3;
252	253
253	254	/* set up the return kernel frame if called from kernel_thread() */
254	255	c_kregs = c_uregs;
@@ -266,7 +267,7 @@ int copy_thread(unsigned long clone_flags, · 11 unmodified lines
266	267	}
267	268
268	269	/* set up things up so the scheduler can start the new task */
269		− p->thread.frame = c_kregs;
	270	+ ti->frame = c_kregs;
270	271	p->thread.a3 = (unsigned long) c_kregs;
271	272	p->thread.sp = c_ksp;
272	273	p->thread.pc = (unsigned long) ret_from_fork;
@@ -278,25 +279,26 @@ int copy_thread(unsigned long clone_flags, · 5 unmodified lines
278	279
279	280	/*
280	281	* clone a process
281		− * - tlsptr is retrieved by copy_thread() from __frame->d3
	282	+ * - tlsptr is retrieved by copy_thread() from current_frame()->d3
282	283	*/
283	284	asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
284	285	int __user parent_tidptr, int __user child_tidptr,
285	286	int __user *tlsptr)
286	287	{
287		− return do_fork(clone_flags, newsp ?: __frame->sp, __frame, 0,
288		− parent_tidptr, child_tidptr);
	288	+ return do_fork(clone_flags, newsp ?: current_frame()->sp,
	289	+ current_frame(), 0, parent_tidptr, child_tidptr);
289	290	}
290	291
291	292	asmlinkage long sys_fork(void)
292	293	{
293		− return do_fork(SIGCHLD, __frame->sp, __frame, 0, NULL, NULL);
	294	+ return do_fork(SIGCHLD, current_frame()->sp,
	295	+ current_frame(), 0, NULL, NULL);
294	296	}
295	297
296	298	asmlinkage long sys_vfork(void)
297	299	{
298		− return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, __frame->sp, __frame,
299		− 0, NULL, NULL);
	300	+ return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, current_frame()->sp,
	301	+ current_frame(), 0, NULL, NULL);
300	302	}
301	303
302	304	asmlinkage long sys_execve(const char __user *name,
@@ -310,7 +312,7 @@ asmlinkage long sys_execve(const char __user *name, · 7 unmodified lines
310	312	error = PTR_ERR(filename);
311	313	if (IS_ERR(filename))
312	314	return error;
313		− error = do_execve(filename, argv, envp, __frame);
	315	+ error = do_execve(filename, argv, envp, current_frame());
314	316	putname(filename);
315	317	return error;
316	318	}

arch/mn10300/kernel/signal.c+11−9

@@ -91,7 +91,7 @@ asmlinkage long sys_sigaction(int sig, · 90 unmodified lines
91	91	*/
92	92	asmlinkage long sys_sigaltstack(const stack_t __user uss, stack_t uoss)
93	93	{
94		− return do_sigaltstack(uss, uoss, __frame->sp);
	94	+ return do_sigaltstack(uss, uoss, current_frame()->sp);
95	95	}
96	96
97	97	/*
@@ -156,10 +156,11 @@ badframe: · 58 unmodified lines
156	156	*/
157	157	asmlinkage long sys_sigreturn(void)
158	158	{
159		− struct sigframe __user frame = (struct sigframe __user ) __frame->sp;
	159	+ struct sigframe __user *frame;
160	160	sigset_t set;
161	161	long d0;
162	162
	163	+ frame = (struct sigframe __user *) current_frame()->sp;
163	164	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
164	165	goto badframe;
165	166	if (__get_user(set.sig[0], &frame->sc.oldmask))
@@ -176,7 +177,7 @@ asmlinkage long sys_sigreturn(void) · 10 unmodified lines
176	177	recalc_sigpending();
177	178	spin_unlock_irq(&current->sighand->siglock);
178	179
179		− if (restore_sigcontext(__frame, &frame->sc, &d0))
	180	+ if (restore_sigcontext(current_frame(), &frame->sc, &d0))
180	181	goto badframe;
181	182
182	183	return d0;
@@ -191,11 +192,11 @@ badframe: · 8 unmodified lines
191	192	*/
192	193	asmlinkage long sys_rt_sigreturn(void)
193	194	{
194		− struct rt_sigframe __user *frame =
195		− (struct rt_sigframe __user *) __frame->sp;
	195	+ struct rt_sigframe __user *frame;
196	196	sigset_t set;
197		− unsigned long d0;
	197	+ long d0;
198	198
	199	+ frame = (struct rt_sigframe __user *) current_frame()->sp;
199	200	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
200	201	goto badframe;
201	202	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
@@ -207,10 +208,11 @@ asmlinkage long sys_rt_sigreturn(void) · 5 unmodified lines
207	208	recalc_sigpending();
208	209	spin_unlock_irq(&current->sighand->siglock);
209	210
210		− if (restore_sigcontext(__frame, &frame->uc.uc_mcontext, &d0))
	211	+ if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
211	212	goto badframe;
212	213
213		− if (do_sigaltstack(&frame->uc.uc_stack, NULL, __frame->sp) == -EFAULT)
	214	+ if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
	215	+ -EFAULT)
214	216	goto badframe;
215	217
216	218	return d0;
@@ -572,7 +574,7 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags) · 355 unmodified lines
572	574
573	575	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
574	576	clear_thread_flag(TIF_NOTIFY_RESUME);
575		− tracehook_notify_resume(__frame);
	577	+ tracehook_notify_resume(current_frame());
576	578	if (current->replacement_session_keyring)
577	579	key_replace_session_keyring();
578	580	}

arch/mn10300/kernel/switch_to.S+0−18

@@ -38,15 +38,6 @@ ENTRY(__switch_to) · 37 unmodified lines
38	38	mov d1,a1
39	39
40	40	# save prev context
41		−#ifdef CONFIG_SMP
42		− mov (CPUID),a2
43		− add a2,a2
44		− add a2,a2
45		− mov (___frame,a2),d0
46		−#else /* CONFIG_SMP */
47		− mov (__frame),d0
48		−#endif /* CONFIG_SMP */
49		− mov d0,(THREAD_FRAME,a0)
50	41	mov __switch_back,d0
51	42	mov d0,(THREAD_PC,a0)
52	43	mov sp,a2
@@ -68,15 +59,6 @@ ENTRY(__switch_to) · 15 unmodified lines
68	59	mov a2,e2
69	60	#endif
70	61
71		− mov (THREAD_FRAME,a1),a2
72		−#ifdef CONFIG_SMP
73		− mov (CPUID),a0
74		− add a0,a0
75		− add a0,a0
76		− mov a2,(___frame,a0)
77		−#else /* CONFIG_SMP */
78		− mov a2,(__frame)
79		−#endif /* CONFIG_SMP */
80	62	mov (THREAD_PC,a1),a2
81	63	mov d2,d0 # for ret_from_fork
82	64	mov d0,a0 # for __switch_to

arch/mn10300/kernel/traps.c+0−8

@@ -45,14 +45,6 @@ · 44 unmodified lines
45	45	#error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
46	46	#endif
47	47
48		−#ifdef CONFIG_SMP
49		−struct pt_regs ___frame[NR_CPUS]; / current frame pointer */
50		−EXPORT_SYMBOL(___frame);
51		−#else /* CONFIG_SMP */
52		−struct pt_regs __frame; / current frame pointer */
53		−EXPORT_SYMBOL(__frame);
54		−#endif /* CONFIG_SMP */
55		−
56	48	int kstack_depth_to_print = 24;
57	49
58	50	spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);

mm/maccess.c+1−1

@@ -1,9 +1,9 @@
1	1	/*
2	2	* Access kernel memory without faulting.
3	3	*/
4		−#include <linux/uaccess.h>
5	4	#include <linux/module.h>
6	5	#include <linux/mm.h>
	6	+#include <linux/uaccess.h>
7	7
8	8	/**
9	9	* probe_kernel_read(): safely attempt to read from a location

MN10300: Save frame pointer in thread_info struct rather than global var

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