From: David Gibson Date: Fri, 21 Oct 2005 05:45:50 +0000 (+1000) Subject: [PATCH] powerpc: Merge thread_info.h X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6cb7bfebb145af5ea1d052512a2ae7ff07a47202;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [PATCH] powerpc: Merge thread_info.h Merge ppc32 and ppc64 versions of thread_info.h. They were pretty similar already, the chief changes are: - Instead of inline asm to implement current_thread_info(), which needs to be different for ppc32 and ppc64, we use C with an asm("r1") register variable. gcc turns it into the same asm as we used to have for both platforms. - We replace ppc32's 'local_flags' with the ppc64 'syscall_noerror' field. The noerror flag was in fact the only thing in the local_flags field anyway, so the ppc64 approach is simpler, and means we only need a load-immediate/store instead of load/mask/store when clearing the flag. - In readiness for 64k pages, when THREAD_SIZE will be less than a page, ppc64 used kmalloc() rather than get_free_pages() to allocate the kernel stack. With this patch we do the same for ppc32, since there's no strong reason not to. - For ppc64, we no longer export THREAD_SHIFT and THREAD_SIZE via asm-offsets, thread_info.h can now be safely included in asm, as on ppc32. Built and booted on G4 Powerbook (ARCH=ppc and ARCH=powerpc) and Power5 (ARCH=ppc64 and ARCH=powerpc). Signed-off-by: David Gibson Signed-off-by: Paul Mackerras --- diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index b0d6a7cd85e9..1c83abd9f37c 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -56,8 +56,6 @@ int main(void) DEFINE(THREAD, offsetof(struct task_struct, thread)); DEFINE(MM, offsetof(struct task_struct, mm)); #ifdef CONFIG_PPC64 - DEFINE(THREAD_SHIFT, THREAD_SHIFT); - DEFINE(THREAD_SIZE, THREAD_SIZE); DEFINE(AUDITCONTEXT, offsetof(struct task_struct, audit_context)); #else DEFINE(THREAD_INFO, offsetof(struct task_struct, thread_info)); @@ -94,12 +92,10 @@ int main(void) DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); -#ifdef CONFIG_PPC64 DEFINE(TI_SC_NOERR, offsetof(struct thread_info, syscall_noerror)); -#else +#ifdef CONFIG_PPC32 DEFINE(TI_TASK, offsetof(struct thread_info, task)); DEFINE(TI_EXECDOMAIN, offsetof(struct thread_info, exec_domain)); - DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags)); DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); #endif /* CONFIG_PPC64 */ diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index fc9dded9ac04..37b4396ca978 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -199,10 +199,9 @@ _GLOBAL(DoSyscall) #ifdef SHOW_SYSCALLS bl do_show_syscall #endif /* SHOW_SYSCALLS */ - rlwinm r10,r1,0,0,18 /* current_thread_info() */ - lwz r11,TI_LOCAL_FLAGS(r10) - rlwinm r11,r11,0,~_TIFL_FORCE_NOERROR - stw r11,TI_LOCAL_FLAGS(r10) + rlwinm r10,r1,0,0,(31-THREAD_SHIFT) /* current_thread_info() */ + li r11,0 + stb r11,TI_SC_NOERR(r10) lwz r11,TI_FLAGS(r10) andi. r11,r11,_TIF_SYSCALL_T_OR_A bne- syscall_dotrace @@ -225,10 +224,10 @@ ret_from_syscall: mr r6,r3 li r11,-_LAST_ERRNO cmplw 0,r3,r11 - rlwinm r12,r1,0,0,18 /* current_thread_info() */ + rlwinm r12,r1,0,0,(31-THREAD_SHIFT) /* current_thread_info() */ blt+ 30f - lwz r11,TI_LOCAL_FLAGS(r12) - andi. r11,r11,_TIFL_FORCE_NOERROR + lbz r11,TI_SC_NOERR(r12) + cmpwi r11,0 bne 30f neg r3,r3 lwz r10,_CCR(r1) /* Set SO bit in CR */ @@ -315,7 +314,7 @@ syscall_exit_work: LOAD_MSR_KERNEL(r10,MSR_KERNEL) /* doesn't include MSR_EE */ SYNC MTMSRD(r10) /* disable interrupts again */ - rlwinm r12,r1,0,0,18 /* current_thread_info() */ + rlwinm r12,r1,0,0,(31-THREAD_SHIFT) /* current_thread_info() */ lwz r9,TI_FLAGS(r12) 5: andi. r0,r9,_TIF_NEED_RESCHED @@ -630,7 +629,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_601) .globl sigreturn_exit sigreturn_exit: subi r1,r3,STACK_FRAME_OVERHEAD - rlwinm r12,r1,0,0,18 /* current_thread_info() */ + rlwinm r12,r1,0,0,(31-THREAD_SHIFT) /* current_thread_info() */ lwz r9,TI_FLAGS(r12) andi. r0,r9,_TIF_SYSCALL_T_OR_A beq+ ret_from_except_full @@ -657,7 +656,7 @@ ret_from_except: user_exc_return: /* r10 contains MSR_KERNEL here */ /* Check current_thread_info()->flags */ - rlwinm r9,r1,0,0,18 + rlwinm r9,r1,0,0,(31-THREAD_SHIFT) lwz r9,TI_FLAGS(r9) andi. r0,r9,(_TIF_SIGPENDING|_TIF_NEED_RESCHED) bne do_work @@ -677,7 +676,7 @@ restore_user: /* N.B. the only way to get here is from the beq following ret_from_except. */ resume_kernel: /* check current_thread_info->preempt_count */ - rlwinm r9,r1,0,0,18 + rlwinm r9,r1,0,0,(31-THREAD_SHIFT) lwz r0,TI_PREEMPT(r9) cmpwi 0,r0,0 /* if non-zero, just restore regs and return */ bne restore @@ -687,7 +686,7 @@ resume_kernel: andi. r0,r3,MSR_EE /* interrupts off? */ beq restore /* don't schedule if so */ 1: bl preempt_schedule_irq - rlwinm r9,r1,0,0,18 + rlwinm r9,r1,0,0,(31-THREAD_SHIFT) lwz r3,TI_FLAGS(r9) andi. r0,r3,_TIF_NEED_RESCHED bne- 1b @@ -889,7 +888,7 @@ recheck: LOAD_MSR_KERNEL(r10,MSR_KERNEL) SYNC MTMSRD(r10) /* disable interrupts */ - rlwinm r9,r1,0,0,18 + rlwinm r9,r1,0,0,(31-THREAD_SHIFT) lwz r9,TI_FLAGS(r9) andi. r0,r9,_TIF_NEED_RESCHED bne- do_resched diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index a4ceb9ae20fc..72b0d26e41d4 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -36,6 +36,7 @@ #include #include #include +#include #ifdef CONFIG_PPC_ISERIES #define DO_SOFT_DISABLE diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S index 8fe295693c09..4775bed42cac 100644 --- a/arch/powerpc/kernel/misc_64.S +++ b/arch/powerpc/kernel/misc_64.S @@ -26,6 +26,7 @@ #include #include #include +#include .text diff --git a/arch/ppc/kernel/asm-offsets.c b/arch/ppc/kernel/asm-offsets.c index 7972db1f6570..968261d69572 100644 --- a/arch/ppc/kernel/asm-offsets.c +++ b/arch/ppc/kernel/asm-offsets.c @@ -130,10 +130,10 @@ main(void) DEFINE(CPU_SPEC_FEATURES, offsetof(struct cpu_spec, cpu_features)); DEFINE(CPU_SPEC_SETUP, offsetof(struct cpu_spec, cpu_setup)); + DEFINE(TI_SC_NOERR, offsetof(struct thread_info, syscall_noerror)); DEFINE(TI_TASK, offsetof(struct thread_info, task)); DEFINE(TI_EXECDOMAIN, offsetof(struct thread_info, exec_domain)); DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); - DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags)); DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); diff --git a/arch/ppc/kernel/entry.S b/arch/ppc/kernel/entry.S index 68fc61221776..f044edbb454f 100644 --- a/arch/ppc/kernel/entry.S +++ b/arch/ppc/kernel/entry.S @@ -200,9 +200,8 @@ _GLOBAL(DoSyscall) bl do_show_syscall #endif /* SHOW_SYSCALLS */ rlwinm r10,r1,0,0,18 /* current_thread_info() */ - lwz r11,TI_LOCAL_FLAGS(r10) - rlwinm r11,r11,0,~_TIFL_FORCE_NOERROR - stw r11,TI_LOCAL_FLAGS(r10) + li r11,0 + stb r11,TI_SC_NOERR(r10) lwz r11,TI_FLAGS(r10) andi. r11,r11,_TIF_SYSCALL_T_OR_A bne- syscall_dotrace @@ -227,8 +226,8 @@ ret_from_syscall: cmplw 0,r3,r11 rlwinm r12,r1,0,0,18 /* current_thread_info() */ blt+ 30f - lwz r11,TI_LOCAL_FLAGS(r12) - andi. r11,r11,_TIFL_FORCE_NOERROR + lbz r11,TI_SC_NOERR(r12) + cmpwi r11,0 bne 30f neg r3,r3 lwz r10,_CCR(r1) /* Set SO bit in CR */ diff --git a/arch/ppc64/kernel/asm-offsets.c b/arch/ppc64/kernel/asm-offsets.c index 1378fbbe1e57..5e6046cb414e 100644 --- a/arch/ppc64/kernel/asm-offsets.c +++ b/arch/ppc64/kernel/asm-offsets.c @@ -46,8 +46,6 @@ int main(void) { /* thread struct on stack */ - DEFINE(THREAD_SHIFT, THREAD_SHIFT); - DEFINE(THREAD_SIZE, THREAD_SIZE); DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); DEFINE(TI_SC_NOERR, offsetof(struct thread_info, syscall_noerror)); diff --git a/arch/ppc64/kernel/head.S b/arch/ppc64/kernel/head.S index d5e6be200764..15c5f0c48043 100644 --- a/arch/ppc64/kernel/head.S +++ b/arch/ppc64/kernel/head.S @@ -36,6 +36,7 @@ #include #include #include +#include #ifdef CONFIG_PPC_ISERIES #define DO_SOFT_DISABLE diff --git a/arch/ppc64/kernel/misc.S b/arch/ppc64/kernel/misc.S index ad73aad8dbb6..a33448c2bd91 100644 --- a/arch/ppc64/kernel/misc.S +++ b/arch/ppc64/kernel/misc.S @@ -28,6 +28,7 @@ #include #include #include +#include .text diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h new file mode 100644 index 000000000000..0b4c24551c21 --- /dev/null +++ b/include/asm-powerpc/thread_info.h @@ -0,0 +1,135 @@ +/* thread_info.h: PowerPC low-level thread information + * adapted from the i386 version by Paul Mackerras + * + * Copyright (C) 2002 David Howells (dhowells@redhat.com) + * - Incorporating suggestions made by Linus Torvalds and Dave Miller + */ + +#ifndef _ASM_POWERPC_THREAD_INFO_H +#define _ASM_POWERPC_THREAD_INFO_H + +#ifdef __KERNEL__ + +/* We have 8k stacks on ppc32 and 16k on ppc64 */ + +#ifdef CONFIG_PPC64 +#define THREAD_SHIFT 14 +#else +#define THREAD_SHIFT 13 +#endif + +#define THREAD_SIZE (1 << THREAD_SHIFT) + +#ifndef __ASSEMBLY__ +#include +#include +#include +#include +#include + +/* + * low level task data. + */ +struct thread_info { + struct task_struct *task; /* main task structure */ + struct exec_domain *exec_domain; /* execution domain */ + int cpu; /* cpu we're on */ + int preempt_count; /* 0 => preemptable, + <0 => BUG */ + struct restart_block restart_block; + /* set by force_successful_syscall_return */ + unsigned char syscall_noerror; + /* low level flags - has atomic operations done on it */ + unsigned long flags ____cacheline_aligned_in_smp; +}; + +/* + * macros/functions for gaining access to the thread information structure + * + * preempt_count needs to be 1 initially, until the scheduler is functional. + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .exec_domain = &default_exec_domain, \ + .cpu = 0, \ + .preempt_count = 1, \ + .restart_block = { \ + .fn = do_no_restart_syscall, \ + }, \ + .flags = 0, \ +} + +#define init_thread_info (init_thread_union.thread_info) +#define init_stack (init_thread_union.stack) + +/* thread information allocation */ + +#ifdef CONFIG_DEBUG_STACK_USAGE +#define alloc_thread_info(tsk) \ + ({ \ + struct thread_info *ret; \ + \ + ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ + if (ret) \ + memset(ret, 0, THREAD_SIZE); \ + ret; \ + }) +#else +#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) +#endif +#define free_thread_info(ti) kfree(ti) +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +/* how to get the thread information struct from C */ +static inline struct thread_info *current_thread_info(void) +{ + register unsigned long sp asm("r1"); + + /* gcc4, at least, is smart enough to turn this into a single + * rlwinm for ppc32 and clrrdi for ppc64 */ + return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); +} + +#endif /* __ASSEMBLY__ */ + +#define PREEMPT_ACTIVE 0x10000000 + +/* + * thread information flag bit numbers + */ +#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ +#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ +#define TIF_SIGPENDING 2 /* signal pending */ +#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ +#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling + TIF_NEED_RESCHED */ +#define TIF_32BIT 5 /* 32 bit binary */ +/* #define SPARE 6 */ +#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */ +#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */ +#define TIF_SINGLESTEP 9 /* singlestepping active */ +#define TIF_MEMDIE 10 +#define TIF_SECCOMP 11 /* secure computing */ + +/* as above, but as bit values */ +#define _TIF_SYSCALL_TRACE (1<local_flags |= _TIFL_FORCE_NOERROR; \ + current_thread_info()->syscall_noerror = 1; \ } while(0) /* diff --git a/include/asm-ppc/thread_info.h b/include/asm-ppc/thread_info.h deleted file mode 100644 index 27903db42efc..000000000000 --- a/include/asm-ppc/thread_info.h +++ /dev/null @@ -1,107 +0,0 @@ -/* thread_info.h: PPC low-level thread information - * adapted from the i386 version by Paul Mackerras - * - * Copyright (C) 2002 David Howells (dhowells@redhat.com) - * - Incorporating suggestions made by Linus Torvalds and Dave Miller - */ - -#ifndef _ASM_THREAD_INFO_H -#define _ASM_THREAD_INFO_H - -#ifdef __KERNEL__ -#ifndef __ASSEMBLY__ -/* - * low level task data. - * If you change this, change the TI_* offsets below to match. - */ -struct thread_info { - struct task_struct *task; /* main task structure */ - struct exec_domain *exec_domain; /* execution domain */ - unsigned long flags; /* low level flags */ - unsigned long local_flags; /* non-racy flags */ - int cpu; /* cpu we're on */ - int preempt_count; /* 0 => preemptable, - <0 => BUG */ - struct restart_block restart_block; -}; - -#define INIT_THREAD_INFO(tsk) \ -{ \ - .task = &tsk, \ - .exec_domain = &default_exec_domain, \ - .flags = 0, \ - .local_flags = 0, \ - .cpu = 0, \ - .preempt_count = 1, \ - .restart_block = { \ - .fn = do_no_restart_syscall, \ - }, \ -} - -#define init_thread_info (init_thread_union.thread_info) -#define init_stack (init_thread_union.stack) - -/* - * macros/functions for gaining access to the thread information structure - */ - -/* how to get the thread information struct from C */ -static inline struct thread_info *current_thread_info(void) -{ - struct thread_info *ti; - __asm__("rlwinm %0,1,0,0,18" : "=r"(ti)); - return ti; -} - -/* thread information allocation */ -#define alloc_thread_info(tsk) ((struct thread_info *) \ - __get_free_pages(GFP_KERNEL, 1)) -#define free_thread_info(ti) free_pages((unsigned long) (ti), 1) -#define get_thread_info(ti) get_task_struct((ti)->task) -#define put_thread_info(ti) put_task_struct((ti)->task) -#endif /* __ASSEMBLY__ */ - -/* - * Size of kernel stack for each process. - */ -#define THREAD_SIZE 8192 /* 2 pages */ - -#define PREEMPT_ACTIVE 0x10000000 - -/* - * thread information flag bit numbers - */ -#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ -#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ -#define TIF_SIGPENDING 2 /* signal pending */ -#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ -#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling - TIF_NEED_RESCHED */ -#define TIF_MEMDIE 5 -#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ -#define TIF_SECCOMP 7 /* secure computing */ - -/* as above, but as bit values */ -#define _TIF_SYSCALL_TRACE (1< -#include -#include -#include -#include - -/* - * low level task data. - */ -struct thread_info { - struct task_struct *task; /* main task structure */ - struct exec_domain *exec_domain; /* execution domain */ - int cpu; /* cpu we're on */ - int preempt_count; /* 0 => preemptable, <0 => BUG */ - struct restart_block restart_block; - /* set by force_successful_syscall_return */ - unsigned char syscall_noerror; - /* low level flags - has atomic operations done on it */ - unsigned long flags ____cacheline_aligned_in_smp; -}; - -/* - * macros/functions for gaining access to the thread information structure - * - * preempt_count needs to be 1 initially, until the scheduler is functional. - */ -#define INIT_THREAD_INFO(tsk) \ -{ \ - .task = &tsk, \ - .exec_domain = &default_exec_domain, \ - .cpu = 0, \ - .preempt_count = 1, \ - .restart_block = { \ - .fn = do_no_restart_syscall, \ - }, \ - .flags = 0, \ -} - -#define init_thread_info (init_thread_union.thread_info) -#define init_stack (init_thread_union.stack) - -/* thread information allocation */ - -#define THREAD_SHIFT 14 -#define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) -#define THREAD_SIZE (1 << THREAD_SHIFT) -#ifdef CONFIG_DEBUG_STACK_USAGE -#define alloc_thread_info(tsk) \ - ({ \ - struct thread_info *ret; \ - \ - ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ - if (ret) \ - memset(ret, 0, THREAD_SIZE); \ - ret; \ - }) -#else -#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) -#endif -#define free_thread_info(ti) kfree(ti) -#define get_thread_info(ti) get_task_struct((ti)->task) -#define put_thread_info(ti) put_task_struct((ti)->task) - -/* how to get the thread information struct from C */ -static inline struct thread_info *current_thread_info(void) -{ - struct thread_info *ti; - __asm__("clrrdi %0,1,%1" : "=r"(ti) : "i" (THREAD_SHIFT)); - return ti; -} - -#endif /* __ASSEMBLY__ */ - -#define PREEMPT_ACTIVE 0x10000000 - -/* - * thread information flag bit numbers - */ -#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ -#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ -#define TIF_SIGPENDING 2 /* signal pending */ -#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ -#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling - TIF_NEED_RESCHED */ -#define TIF_32BIT 5 /* 32 bit binary */ -/* #define SPARE 6 */ -#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */ -#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */ -#define TIF_SINGLESTEP 9 /* singlestepping active */ -#define TIF_MEMDIE 10 -#define TIF_SECCOMP 11 /* secure computing */ - -/* as above, but as bit values */ -#define _TIF_SYSCALL_TRACE (1<