1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
2b8b572e1SStephen Rothwell /* thread_info.h: PowerPC low-level thread information
3b8b572e1SStephen Rothwell * adapted from the i386 version by Paul Mackerras
4b8b572e1SStephen Rothwell *
5b8b572e1SStephen Rothwell * Copyright (C) 2002 David Howells (dhowells@redhat.com)
6b8b572e1SStephen Rothwell * - Incorporating suggestions made by Linus Torvalds and Dave Miller
7b8b572e1SStephen Rothwell */
8b8b572e1SStephen Rothwell
9b8b572e1SStephen Rothwell #ifndef _ASM_POWERPC_THREAD_INFO_H
10b8b572e1SStephen Rothwell #define _ASM_POWERPC_THREAD_INFO_H
11b8b572e1SStephen Rothwell
12ec0c464cSChristophe Leroy #include <asm/asm-const.h>
1302847487SChristophe Leroy #include <asm/page.h>
14ec0c464cSChristophe Leroy
15b8b572e1SStephen Rothwell #ifdef __KERNEL__
16b8b572e1SStephen Rothwell
17f1acb109SMichael Ellerman #if defined(CONFIG_KASAN) && CONFIG_THREAD_SHIFT < 15
183e8635fbSMichael Ellerman #define MIN_THREAD_SHIFT (CONFIG_THREAD_SHIFT + 1)
193e8635fbSMichael Ellerman #else
203e8635fbSMichael Ellerman #define MIN_THREAD_SHIFT CONFIG_THREAD_SHIFT
213e8635fbSMichael Ellerman #endif
223e8635fbSMichael Ellerman
233e8635fbSMichael Ellerman #if defined(CONFIG_VMAP_STACK) && MIN_THREAD_SHIFT < PAGE_SHIFT
2402847487SChristophe Leroy #define THREAD_SHIFT PAGE_SHIFT
2502847487SChristophe Leroy #else
263e8635fbSMichael Ellerman #define THREAD_SHIFT MIN_THREAD_SHIFT
2702847487SChristophe Leroy #endif
28b8b572e1SStephen Rothwell
29b8b572e1SStephen Rothwell #define THREAD_SIZE (1 << THREAD_SHIFT)
30b8b572e1SStephen Rothwell
3163289e7dSChristophe Leroy /*
3263289e7dSChristophe Leroy * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
3363289e7dSChristophe Leroy * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
3463289e7dSChristophe Leroy * assembly.
3563289e7dSChristophe Leroy */
3663289e7dSChristophe Leroy #ifdef CONFIG_VMAP_STACK
3763289e7dSChristophe Leroy #define THREAD_ALIGN_SHIFT (THREAD_SHIFT + 1)
3863289e7dSChristophe Leroy #else
3963289e7dSChristophe Leroy #define THREAD_ALIGN_SHIFT THREAD_SHIFT
4063289e7dSChristophe Leroy #endif
4163289e7dSChristophe Leroy
4263289e7dSChristophe Leroy #define THREAD_ALIGN (1 << THREAD_ALIGN_SHIFT)
4363289e7dSChristophe Leroy
44b8b572e1SStephen Rothwell #ifndef __ASSEMBLY__
45b8b572e1SStephen Rothwell #include <linux/cache.h>
46b8b572e1SStephen Rothwell #include <asm/processor.h>
47c223c903SChristophe Leroy #include <asm/accounting.h>
48ac9c8901SNicholas Miehlbradt #include <asm/ppc_asm.h>
49b8b572e1SStephen Rothwell
505434ae74SNicholas Piggin #define SLB_PRELOAD_NR 16U
51b8b572e1SStephen Rothwell /*
52b8b572e1SStephen Rothwell * low level task data.
53b8b572e1SStephen Rothwell */
54b8b572e1SStephen Rothwell struct thread_info {
55b8b572e1SStephen Rothwell int preempt_count; /* 0 => preemptable,
56b8b572e1SStephen Rothwell <0 => BUG */
57227d735dSArd Biesheuvel #ifdef CONFIG_SMP
58227d735dSArd Biesheuvel unsigned int cpu;
59227d735dSArd Biesheuvel #endif
60b8b572e1SStephen Rothwell unsigned long local_flags; /* private flags for thread */
61a4520b25SChristophe Leroy #ifdef CONFIG_LIVEPATCH_64
625d31a96eSMichael Ellerman unsigned long *livepatch_sp;
635d31a96eSMichael Ellerman #endif
64c223c903SChristophe Leroy #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
65c223c903SChristophe Leroy struct cpu_accounting_data accounting;
66c223c903SChristophe Leroy #endif
675434ae74SNicholas Piggin unsigned char slb_preload_nr;
685434ae74SNicholas Piggin unsigned char slb_preload_tail;
695434ae74SNicholas Piggin u32 slb_preload_esid[SLB_PRELOAD_NR];
705434ae74SNicholas Piggin
71b8b572e1SStephen Rothwell /* low level flags - has atomic operations done on it */
72b8b572e1SStephen Rothwell unsigned long flags ____cacheline_aligned_in_smp;
73b8b572e1SStephen Rothwell };
74b8b572e1SStephen Rothwell
75b8b572e1SStephen Rothwell /*
76b8b572e1SStephen Rothwell * macros/functions for gaining access to the thread information structure
77b8b572e1SStephen Rothwell */
78b8b572e1SStephen Rothwell #define INIT_THREAD_INFO(tsk) \
79b8b572e1SStephen Rothwell { \
80c99e6efeSPeter Zijlstra .preempt_count = INIT_PREEMPT_COUNT, \
81b8b572e1SStephen Rothwell .flags = 0, \
82b8b572e1SStephen Rothwell }
83b8b572e1SStephen Rothwell
84b8b572e1SStephen Rothwell #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
85b8b572e1SStephen Rothwell
86b8b572e1SStephen Rothwell /* how to get the thread information struct from C */
87fd70d9f9SMathieu Malaterre extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
88425d3314SNicholas Piggin
89425d3314SNicholas Piggin void arch_setup_new_exec(void);
90425d3314SNicholas Piggin #define arch_setup_new_exec arch_setup_new_exec
91425d3314SNicholas Piggin
92b8b572e1SStephen Rothwell #endif /* __ASSEMBLY__ */
93b8b572e1SStephen Rothwell
94b8b572e1SStephen Rothwell /*
95b8b572e1SStephen Rothwell * thread information flag bit numbers
96b8b572e1SStephen Rothwell */
97b8b572e1SStephen Rothwell #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
98b8b572e1SStephen Rothwell #define TIF_SIGPENDING 1 /* signal pending */
99b8b572e1SStephen Rothwell #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
100900f0713SJens Axboe #define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */
1015521eb4bSBreno Leitao #define TIF_SYSCALL_EMU 4 /* syscall emulation active */
102d31626f7SPaul Mackerras #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
103a768f784SJosh Poimboeuf #define TIF_PATCH_PENDING 6 /* pending live patching update */
104b8b572e1SStephen Rothwell #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
105b8b572e1SStephen Rothwell #define TIF_SINGLESTEP 8 /* singlestepping active */
106b8b572e1SStephen Rothwell #define TIF_SECCOMP 10 /* secure computing */
107b8b572e1SStephen Rothwell #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
108b8b572e1SStephen Rothwell #define TIF_NOERROR 12 /* Force successful syscall return */
109b8b572e1SStephen Rothwell #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
1108b7b80b9SAnanth N Mavinakayanahalli #define TIF_UPROBE 14 /* breakpointed or single-stepping */
11102424d89SIan Munsie #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
112f0d1128fSTiejun Chen #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
113f0d1128fSTiejun Chen for stack store? */
11422ecbe8dSLi Zhong #define TIF_MEMDIE 17 /* is terminating due to OOM killer */
115373c76d6SRusty Russell #if defined(CONFIG_PPC64)
116373c76d6SRusty Russell #define TIF_ELF2ABI 18 /* function descriptors must die! */
117373c76d6SRusty Russell #endif
1183e378680SMichael Ellerman #define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling TIF_NEED_RESCHED */
11916d7c69cSBreno Leitao #define TIF_32BIT 20 /* 32 bit binary */
120b8b572e1SStephen Rothwell
121b8b572e1SStephen Rothwell /* as above, but as bit values */
122b8b572e1SStephen Rothwell #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
123b8b572e1SStephen Rothwell #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
124b8b572e1SStephen Rothwell #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
125900f0713SJens Axboe #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
126b8b572e1SStephen Rothwell #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
127b8b572e1SStephen Rothwell #define _TIF_32BIT (1<<TIF_32BIT)
128d31626f7SPaul Mackerras #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
129a768f784SJosh Poimboeuf #define _TIF_PATCH_PENDING (1<<TIF_PATCH_PENDING)
130b8b572e1SStephen Rothwell #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
131b8b572e1SStephen Rothwell #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
132b8b572e1SStephen Rothwell #define _TIF_SECCOMP (1<<TIF_SECCOMP)
133b8b572e1SStephen Rothwell #define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
134b8b572e1SStephen Rothwell #define _TIF_NOERROR (1<<TIF_NOERROR)
135b8b572e1SStephen Rothwell #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
1368b7b80b9SAnanth N Mavinakayanahalli #define _TIF_UPROBE (1<<TIF_UPROBE)
13702424d89SIan Munsie #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
138f0d1128fSTiejun Chen #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
1395521eb4bSBreno Leitao #define _TIF_SYSCALL_EMU (1<<TIF_SYSCALL_EMU)
14010ea8343SMichael Ellerman #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
14122ecbe8dSLi Zhong _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
1422a06bf3eSNicholas Piggin _TIF_SYSCALL_EMU)
143b8b572e1SStephen Rothwell
144b8b572e1SStephen Rothwell #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
145d31626f7SPaul Mackerras _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
146900f0713SJens Axboe _TIF_RESTORE_TM | _TIF_PATCH_PENDING | \
147900f0713SJens Axboe _TIF_NOTIFY_SIGNAL)
148b8b572e1SStephen Rothwell #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR)
149b8b572e1SStephen Rothwell
150b8b572e1SStephen Rothwell /* Bits in local_flags */
151b8b572e1SStephen Rothwell /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
152b8b572e1SStephen Rothwell #define TLF_NAPPING 0 /* idle thread enabled NAP mode */
153b8b572e1SStephen Rothwell #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
154d6bf29b4SPeter Zijlstra #define TLF_LAZY_MMU 3 /* tlb_batch is active */
155fe1952fcSBenjamin Herrenschmidt #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
156b8b572e1SStephen Rothwell
157b8b572e1SStephen Rothwell #define _TLF_NAPPING (1 << TLF_NAPPING)
158b8b572e1SStephen Rothwell #define _TLF_SLEEPING (1 << TLF_SLEEPING)
159d6bf29b4SPeter Zijlstra #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
160fe1952fcSBenjamin Herrenschmidt #define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
161b8b572e1SStephen Rothwell
162b8b572e1SStephen Rothwell #ifndef __ASSEMBLY__
163a465f9b6SAnton Blanchard
clear_thread_local_flags(unsigned int flags)16498db179aSNicholas Piggin static inline void clear_thread_local_flags(unsigned int flags)
16598db179aSNicholas Piggin {
16698db179aSNicholas Piggin struct thread_info *ti = current_thread_info();
16798db179aSNicholas Piggin ti->local_flags &= ~flags;
16898db179aSNicholas Piggin }
16998db179aSNicholas Piggin
test_thread_local_flags(unsigned int flags)170fe1952fcSBenjamin Herrenschmidt static inline bool test_thread_local_flags(unsigned int flags)
171fe1952fcSBenjamin Herrenschmidt {
172fe1952fcSBenjamin Herrenschmidt struct thread_info *ti = current_thread_info();
173fe1952fcSBenjamin Herrenschmidt return (ti->local_flags & flags) != 0;
174fe1952fcSBenjamin Herrenschmidt }
175fe1952fcSBenjamin Herrenschmidt
1760a7601b6SMichal Suchanek #ifdef CONFIG_COMPAT
177a465f9b6SAnton Blanchard #define is_32bit_task() (test_thread_flag(TIF_32BIT))
17825274524SChristophe Leroy #define is_tsk_32bit_task(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT))
179eed7c420SNicholas Piggin #define clear_tsk_compat_task(tsk) (clear_tsk_thread_flag(p, TIF_32BIT))
180a465f9b6SAnton Blanchard #else
1810a7601b6SMichal Suchanek #define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
18225274524SChristophe Leroy #define is_tsk_32bit_task(tsk) (IS_ENABLED(CONFIG_PPC32))
183eed7c420SNicholas Piggin #define clear_tsk_compat_task(tsk) do { } while (0)
184a465f9b6SAnton Blanchard #endif
185a465f9b6SAnton Blanchard
186106ea7ffSAndrew Donnellan #if defined(CONFIG_PPC64)
187373c76d6SRusty Russell #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
188373c76d6SRusty Russell #else
189373c76d6SRusty Russell #define is_elf2_task() (0)
190373c76d6SRusty Russell #endif
191373c76d6SRusty Russell
192ac9c8901SNicholas Miehlbradt /*
193ac9c8901SNicholas Miehlbradt * Walks up the stack frames to make sure that the specified object is
194ac9c8901SNicholas Miehlbradt * entirely contained by a single stack frame.
195ac9c8901SNicholas Miehlbradt *
196ac9c8901SNicholas Miehlbradt * Returns:
197ac9c8901SNicholas Miehlbradt * GOOD_FRAME if within a frame
198ac9c8901SNicholas Miehlbradt * BAD_STACK if placed across a frame boundary (or outside stack)
199ac9c8901SNicholas Miehlbradt */
arch_within_stack_frames(const void * const stack,const void * const stackend,const void * obj,unsigned long len)200ac9c8901SNicholas Miehlbradt static inline int arch_within_stack_frames(const void * const stack,
201ac9c8901SNicholas Miehlbradt const void * const stackend,
202ac9c8901SNicholas Miehlbradt const void *obj, unsigned long len)
203ac9c8901SNicholas Miehlbradt {
204ac9c8901SNicholas Miehlbradt const void *params;
205ac9c8901SNicholas Miehlbradt const void *frame;
206ac9c8901SNicholas Miehlbradt
207ac9c8901SNicholas Miehlbradt params = *(const void * const *)current_stack_pointer + STACK_FRAME_PARAMS;
208ac9c8901SNicholas Miehlbradt frame = **(const void * const * const *)current_stack_pointer;
209ac9c8901SNicholas Miehlbradt
210ac9c8901SNicholas Miehlbradt /*
211ac9c8901SNicholas Miehlbradt * low -----------------------------------------------------------> high
212ac9c8901SNicholas Miehlbradt * [backchain][metadata][params][local vars][saved registers][backchain]
213ac9c8901SNicholas Miehlbradt * ^------------------------------------^
214ac9c8901SNicholas Miehlbradt * | allows copies only in this region |
215ac9c8901SNicholas Miehlbradt * | |
216ac9c8901SNicholas Miehlbradt * params frame
217ac9c8901SNicholas Miehlbradt * The metadata region contains the saved LR, CR etc.
218ac9c8901SNicholas Miehlbradt */
219ac9c8901SNicholas Miehlbradt while (stack <= frame && frame < stackend) {
220ac9c8901SNicholas Miehlbradt if (obj + len <= frame)
221ac9c8901SNicholas Miehlbradt return obj >= params ? GOOD_FRAME : BAD_STACK;
222ac9c8901SNicholas Miehlbradt params = frame + STACK_FRAME_PARAMS;
223ac9c8901SNicholas Miehlbradt frame = *(const void * const *)frame;
224ac9c8901SNicholas Miehlbradt }
225ac9c8901SNicholas Miehlbradt
226ac9c8901SNicholas Miehlbradt return BAD_STACK;
227ac9c8901SNicholas Miehlbradt }
228ac9c8901SNicholas Miehlbradt
229*dca5b1d6SChristophe Leroy #ifdef CONFIG_PPC32
230*dca5b1d6SChristophe Leroy extern void *emergency_ctx[];
231*dca5b1d6SChristophe Leroy #endif
232*dca5b1d6SChristophe Leroy
233b8b572e1SStephen Rothwell #endif /* !__ASSEMBLY__ */
234b8b572e1SStephen Rothwell
235b8b572e1SStephen Rothwell #endif /* __KERNEL__ */
236b8b572e1SStephen Rothwell
237b8b572e1SStephen Rothwell #endif /* _ASM_POWERPC_THREAD_INFO_H */
238