From: Nicholas Piggin Date: Tue, 25 Feb 2020 17:35:34 +0000 (+1000) Subject: powerpc/64/sycall: Implement syscall entry/exit logic in C X-Git-Tag: v5.10.7~2835^2~46 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=68b34588e2027f699a3c034235f21cd19356b2e6;p=platform%2Fkernel%2Flinux-rpi.git powerpc/64/sycall: Implement syscall entry/exit logic in C System call entry and particularly exit code is beyond the limit of what is reasonable to implement in asm. This conversion moves all conditional branches out of the asm code, except for the case that all GPRs should be restored at exit. Null syscall test is about 5% faster after this patch, because the exit work is handled under local_irq_disable, and the hard mask and pending interrupt replay is handled after that, which avoids games with MSR. mpe: Includes subsequent fixes from Nick: This fixes 4 issues caught by TM selftests. First was a tm-syscall bug that hit due to tabort_syscall being called after interrupts were reconciled (in a subsequent patch), which led to interrupts being enabled before tabort_syscall was called. Rather than going through an un-reconciling interrupts for the return, I just go back to putting the test early in asm, the C-ification of that wasn't a big win anyway. Second is the syscall return _TIF_USER_WORK_MASK check would go into an infinite loop if _TIF_RESTORE_TM became set. The asm code uses _TIF_USER_WORK_MASK to brach to slowpath which includes restore_tm_state. Third is system call return was not calling restore_tm_state, I missed this completely (alhtough it's in the return from interrupt C conversion because when the asm syscall code encountered problems it would branch to the interrupt return code. Fourth is MSR_VEC missing from restore_math, which was caught by tm-unavailable selftest taking an unexpected facility unavailable interrupt when testing VSX unavailble exception with MSR.FP=1 MSR.VEC=1. Fourth case also has a fixup in a subsequent patch. Signed-off-by: Nicholas Piggin Signed-off-by: Michal Suchanek Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200225173541.1549955-26-npiggin@gmail.com --- diff --git a/arch/powerpc/include/asm/asm-prototypes.h b/arch/powerpc/include/asm/asm-prototypes.h index 983c008..ab59a490 100644 --- a/arch/powerpc/include/asm/asm-prototypes.h +++ b/arch/powerpc/include/asm/asm-prototypes.h @@ -97,6 +97,8 @@ ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, unsigned long __init early_init(unsigned long dt_ptr); void __init machine_init(u64 dt_ptr); #endif +long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, unsigned long r0, struct pt_regs *regs); +notrace unsigned long syscall_exit_prepare(unsigned long r3, struct pt_regs *regs); long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, u32 len_high, u32 len_low); @@ -104,14 +106,6 @@ long sys_switch_endian(void); notrace unsigned int __check_irq_replay(void); void notrace restore_interrupts(void); -/* ptrace */ -long do_syscall_trace_enter(struct pt_regs *regs); -void do_syscall_trace_leave(struct pt_regs *regs); - -/* process */ -void restore_math(struct pt_regs *regs); -void restore_tm_state(struct pt_regs *regs); - /* prom_init (OpenFirmware) */ unsigned long __init prom_init(unsigned long r3, unsigned long r4, unsigned long pp, @@ -122,9 +116,6 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4, void __init early_setup(unsigned long dt_ptr); void early_setup_secondary(void); -/* time */ -void accumulate_stolen_time(void); - /* misc runtime */ extern u64 __bswapdi2(u64); extern s64 __lshrdi3(s64, int); diff --git a/arch/powerpc/include/asm/book3s/64/kup-radix.h b/arch/powerpc/include/asm/book3s/64/kup-radix.h index 90dd3a3..71081d9 100644 --- a/arch/powerpc/include/asm/book3s/64/kup-radix.h +++ b/arch/powerpc/include/asm/book3s/64/kup-radix.h @@ -3,6 +3,7 @@ #define _ASM_POWERPC_BOOK3S_64_KUP_RADIX_H #include +#include #define AMR_KUAP_BLOCK_READ UL(0x4000000000000000) #define AMR_KUAP_BLOCK_WRITE UL(0x8000000000000000) @@ -56,7 +57,14 @@ #ifdef CONFIG_PPC_KUAP -#include +#include +#include + +static inline void kuap_check_amr(void) +{ + if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG) && mmu_has_feature(MMU_FTR_RADIX_KUAP)) + WARN_ON_ONCE(mfspr(SPRN_AMR) != AMR_KUAP_BLOCKED); +} /* * We support individually allowing read or write, but we don't support nesting @@ -127,6 +135,10 @@ bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) (regs->kuap & (is_write ? AMR_KUAP_BLOCK_WRITE : AMR_KUAP_BLOCK_READ)), "Bug: %s fault blocked by AMR!", is_write ? "Write" : "Read"); } +#else /* CONFIG_PPC_KUAP */ +static inline void kuap_check_amr(void) +{ +} #endif /* CONFIG_PPC_KUAP */ #endif /* __ASSEMBLY__ */ diff --git a/arch/powerpc/include/asm/cputime.h b/arch/powerpc/include/asm/cputime.h index 2431b4a..0fccd5e 100644 --- a/arch/powerpc/include/asm/cputime.h +++ b/arch/powerpc/include/asm/cputime.h @@ -43,9 +43,12 @@ static inline unsigned long cputime_to_usecs(const cputime_t ct) */ #ifdef CONFIG_PPC64 #define get_accounting(tsk) (&get_paca()->accounting) +#define raw_get_accounting(tsk) (&local_paca->accounting) static inline void arch_vtime_task_switch(struct task_struct *tsk) { } + #else #define get_accounting(tsk) (&task_thread_info(tsk)->accounting) +#define raw_get_accounting(tsk) get_accounting(tsk) /* * Called from the context switch with interrupts disabled, to charge all * accumulated times to the current process, and to prepare accounting on @@ -60,6 +63,36 @@ static inline void arch_vtime_task_switch(struct task_struct *prev) } #endif +/* + * account_cpu_user_entry/exit runs "unreconciled", so can't trace, + * can't use use get_paca() + */ +static notrace inline void account_cpu_user_entry(void) +{ + unsigned long tb = mftb(); + struct cpu_accounting_data *acct = raw_get_accounting(current); + + acct->utime += (tb - acct->starttime_user); + acct->starttime = tb; +} + +static notrace inline void account_cpu_user_exit(void) +{ + unsigned long tb = mftb(); + struct cpu_accounting_data *acct = raw_get_accounting(current); + + acct->stime += (tb - acct->starttime); + acct->starttime_user = tb; +} + + #endif /* __KERNEL__ */ +#else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ +static inline void account_cpu_user_entry(void) +{ +} +static inline void account_cpu_user_exit(void) +{ +} #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ #endif /* __POWERPC_CPUTIME_H */ diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h index e3a905e..310583e 100644 --- a/arch/powerpc/include/asm/hw_irq.h +++ b/arch/powerpc/include/asm/hw_irq.h @@ -228,9 +228,13 @@ static inline bool arch_irqs_disabled(void) #ifdef CONFIG_PPC_BOOK3E #define __hard_irq_enable() wrtee(MSR_EE) #define __hard_irq_disable() wrtee(0) +#define __hard_EE_RI_disable() wrtee(0) +#define __hard_RI_enable() do { } while (0) #else #define __hard_irq_enable() __mtmsrd(MSR_EE|MSR_RI, 1) #define __hard_irq_disable() __mtmsrd(MSR_RI, 1) +#define __hard_EE_RI_disable() __mtmsrd(0, 1) +#define __hard_RI_enable() __mtmsrd(MSR_RI, 1) #endif #define hard_irq_disable() do { \ diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h index ee3ada6..082a401 100644 --- a/arch/powerpc/include/asm/ptrace.h +++ b/arch/powerpc/include/asm/ptrace.h @@ -138,6 +138,9 @@ extern unsigned long profile_pc(struct pt_regs *regs); #define profile_pc(regs) instruction_pointer(regs) #endif +long do_syscall_trace_enter(struct pt_regs *regs); +void do_syscall_trace_leave(struct pt_regs *regs); + #define kernel_stack_pointer(regs) ((regs)->gpr[1]) static inline int is_syscall_success(struct pt_regs *regs) { diff --git a/arch/powerpc/include/asm/signal.h b/arch/powerpc/include/asm/signal.h index 0803ca8b..99e1c6d 100644 --- a/arch/powerpc/include/asm/signal.h +++ b/arch/powerpc/include/asm/signal.h @@ -6,4 +6,7 @@ #include #include +struct pt_regs; +void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags); + #endif /* _ASM_POWERPC_SIGNAL_H */ diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h index 5b03d8a..476008b 100644 --- a/arch/powerpc/include/asm/switch_to.h +++ b/arch/powerpc/include/asm/switch_to.h @@ -5,6 +5,7 @@ #ifndef _ASM_POWERPC_SWITCH_TO_H #define _ASM_POWERPC_SWITCH_TO_H +#include #include struct thread_struct; @@ -22,6 +23,10 @@ extern void switch_booke_debug_regs(struct debug_reg *new_debug); extern int emulate_altivec(struct pt_regs *); +void restore_math(struct pt_regs *regs); + +void restore_tm_state(struct pt_regs *regs); + extern void flush_all_to_thread(struct task_struct *); extern void giveup_all(struct task_struct *); diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h index e010749..39ce950 100644 --- a/arch/powerpc/include/asm/time.h +++ b/arch/powerpc/include/asm/time.h @@ -194,5 +194,8 @@ DECLARE_PER_CPU(u64, decrementers_next_tb); /* Convert timebase ticks to nanoseconds */ unsigned long long tb_to_ns(unsigned long long tb_ticks); +/* SPLPAR */ +void accumulate_stolen_time(void); + #endif /* __KERNEL__ */ #endif /* __POWERPC_TIME_H */ diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 78a1b22..5700231 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -50,7 +50,8 @@ obj-y := cputable.o ptrace.o syscalls.o \ of_platform.o prom_parse.o obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \ signal_64.o ptrace32.o \ - paca.o nvram_64.o firmware.o note.o + paca.o nvram_64.o firmware.o note.o \ + syscall_64.o obj-$(CONFIG_VDSO32) += vdso32/ obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 14afe12..5f70830 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -69,6 +69,7 @@ BEGIN_FTR_SECTION bne .Ltabort_syscall END_FTR_SECTION_IFSET(CPU_FTR_TM) #endif +_ASM_NOKPROBE_SYMBOL(system_call_common) mr r10,r1 ld r1,PACAKSAVE(r13) std r10,0(r1) @@ -76,341 +77,98 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM) std r12,_MSR(r1) std r0,GPR0(r1) std r10,GPR1(r1) + std r2,GPR2(r1) #ifdef CONFIG_PPC_FSL_BOOK3E START_BTB_FLUSH_SECTION BTB_FLUSH(r10) END_BTB_FLUSH_SECTION #endif - ACCOUNT_CPU_USER_ENTRY(r13, r10, r11) - std r2,GPR2(r1) + ld r2,PACATOC(r13) + mfcr r12 + li r11,0 + /* Can we avoid saving r3-r8 in common case? */ std r3,GPR3(r1) - mfcr r2 std r4,GPR4(r1) std r5,GPR5(r1) std r6,GPR6(r1) std r7,GPR7(r1) std r8,GPR8(r1) - li r11,0 + /* Zero r9-r12, this should only be required when restoring all GPRs */ std r11,GPR9(r1) std r11,GPR10(r1) std r11,GPR11(r1) std r11,GPR12(r1) - std r11,_XER(r1) - std r11,_CTR(r1) std r9,GPR13(r1) SAVE_NVGPRS(r1) + std r11,_XER(r1) + std r11,_CTR(r1) mflr r10 + /* * This clears CR0.SO (bit 28), which is the error indication on * return from this system call. */ - rldimi r2,r11,28,(63-28) + rldimi r12,r11,28,(63-28) li r11,0xc00 std r10,_LINK(r1) std r11,_TRAP(r1) + std r12,_CCR(r1) std r3,ORIG_GPR3(r1) - std r2,_CCR(r1) - ld r2,PACATOC(r13) - addi r9,r1,STACK_FRAME_OVERHEAD + addi r10,r1,STACK_FRAME_OVERHEAD ld r11,exception_marker@toc(r2) - std r11,-16(r9) /* "regshere" marker */ - - kuap_check_amr r10, r11 - -#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC_SPLPAR) -BEGIN_FW_FTR_SECTION - /* see if there are any DTL entries to process */ - ld r10,PACALPPACAPTR(r13) /* get ptr to VPA */ - ld r11,PACA_DTL_RIDX(r13) /* get log read index */ - addi r10,r10,LPPACA_DTLIDX - LDX_BE r10,0,r10 /* get log write index */ - cmpd r11,r10 - beq+ 33f - bl accumulate_stolen_time - REST_GPR(0,r1) - REST_4GPRS(3,r1) - REST_2GPRS(7,r1) - addi r9,r1,STACK_FRAME_OVERHEAD -33: -END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR) -#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE && CONFIG_PPC_SPLPAR */ - - /* - * A syscall should always be called with interrupts enabled - * so we just unconditionally hard-enable here. When some kind - * of irq tracing is used, we additionally check that condition - * is correct - */ -#if defined(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG) && defined(CONFIG_BUG) - lbz r10,PACAIRQSOFTMASK(r13) -1: tdnei r10,IRQS_ENABLED - EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING -#endif - -#ifdef CONFIG_PPC_BOOK3E - wrteei 1 -#else - li r11,MSR_RI - ori r11,r11,MSR_EE - mtmsrd r11,1 -#endif /* CONFIG_PPC_BOOK3E */ - -system_call: /* label this so stack traces look sane */ - /* We do need to set SOFTE in the stack frame or the return - * from interrupt will be painful - */ - li r10,IRQS_ENABLED - std r10,SOFTE(r1) - - ld r11, PACA_THREAD_INFO(r13) - ld r10,TI_FLAGS(r11) - andi. r11,r10,_TIF_SYSCALL_DOTRACE - bne .Lsyscall_dotrace /* does not return */ - cmpldi 0,r0,NR_syscalls - bge- .Lsyscall_enosys + std r11,-16(r10) /* "regshere" marker */ -.Lsyscall: -/* - * Need to vector to 32 Bit or default sys_call_table here, - * based on caller's run-mode / personality. - */ - ld r11,SYS_CALL_TABLE@toc(2) - andis. r10,r10,_TIF_32BIT@h - beq 15f - ld r11,COMPAT_SYS_CALL_TABLE@toc(2) - clrldi r3,r3,32 - clrldi r4,r4,32 - clrldi r5,r5,32 - clrldi r6,r6,32 - clrldi r7,r7,32 - clrldi r8,r8,32 -15: - slwi r0,r0,3 - - barrier_nospec_asm - /* - * Prevent the load of the handler below (based on the user-passed - * system call number) being speculatively executed until the test - * against NR_syscalls and branch to .Lsyscall_enosys above has - * committed. - */ - - ldx r12,r11,r0 /* Fetch system call handler [ptr] */ - mtctr r12 - bctrl /* Call handler */ + /* Calling convention has r9 = orig r0, r10 = regs */ + mr r9,r0 + bl system_call_exception - /* syscall_exit can exit to kernel mode, via ret_from_kernel_thread */ .Lsyscall_exit: - std r3,RESULT(r1) - -#ifdef CONFIG_DEBUG_RSEQ - /* Check whether the syscall is issued inside a restartable sequence */ - addi r3,r1,STACK_FRAME_OVERHEAD - bl rseq_syscall - ld r3,RESULT(r1) -#endif - - ld r12, PACA_THREAD_INFO(r13) - - ld r8,_MSR(r1) - -/* - * This is a few instructions into the actual syscall exit path (which actually - * starts at .Lsyscall_exit) to cater to kprobe blacklisting and to reduce the - * number of visible symbols for profiling purposes. - * - * We can probe from system_call until this point as MSR_RI is set. But once it - * is cleared below, we won't be able to take a trap. - * - * This is blacklisted from kprobes further below with _ASM_NOKPROBE_SYMBOL(). - */ -system_call_exit: - /* - * Disable interrupts so current_thread_info()->flags can't change, - * and so that we don't get interrupted after loading SRR0/1. - * - * Leave MSR_RI enabled for now, because with THREAD_INFO_IN_TASK we - * could fault on the load of the TI_FLAGS below. - */ -#ifdef CONFIG_PPC_BOOK3E - wrteei 0 -#else - li r11,MSR_RI - mtmsrd r11,1 -#endif /* CONFIG_PPC_BOOK3E */ + addi r4,r1,STACK_FRAME_OVERHEAD + bl syscall_exit_prepare - ld r9,TI_FLAGS(r12) - li r11,-MAX_ERRNO - andi. r0,r9,(_TIF_SYSCALL_DOTRACE|_TIF_SINGLESTEP|_TIF_USER_WORK_MASK|_TIF_PERSYSCALL_MASK) - bne- .Lsyscall_exit_work + ld r2,_CCR(r1) + ld r4,_NIP(r1) + ld r5,_MSR(r1) + ld r6,_LINK(r1) - andi. r0,r8,MSR_FP - beq 2f -#ifdef CONFIG_ALTIVEC - andis. r0,r8,MSR_VEC@h - bne 3f -#endif -2: addi r3,r1,STACK_FRAME_OVERHEAD - bl restore_math - ld r8,_MSR(r1) - ld r3,RESULT(r1) - li r11,-MAX_ERRNO - -3: cmpld r3,r11 - ld r5,_CCR(r1) - bge- .Lsyscall_error -.Lsyscall_error_cont: - ld r7,_NIP(r1) BEGIN_FTR_SECTION stdcx. r0,0,r1 /* to clear the reservation */ END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) - andi. r6,r8,MSR_PR - ld r4,_LINK(r1) - kuap_check_amr r10, r11 + mtspr SPRN_SRR0,r4 + mtspr SPRN_SRR1,r5 + mtlr r6 -#ifdef CONFIG_PPC_BOOK3S - /* - * Clear MSR_RI, MSR_EE is already and remains disabled. We could do - * this later, but testing shows that doing it here causes less slow - * down than doing it closer to the rfid. - */ - li r11,0 - mtmsrd r11,1 -#endif - - beq- 1f - ACCOUNT_CPU_USER_EXIT(r13, r11, r12) + cmpdi r3,0 + bne .Lsyscall_restore_regs +.Lsyscall_restore_regs_cont: BEGIN_FTR_SECTION HMT_MEDIUM_LOW END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) -#ifdef CONFIG_PPC_TRANSACTIONAL_MEM - std r8, PACATMSCRATCH(r13) -#endif - /* * We don't need to restore AMR on the way back to userspace for KUAP. * The value of AMR only matters while we're in the kernel. */ - ld r13,GPR13(r1) /* only restore r13 if returning to usermode */ + mtcr r2 ld r2,GPR2(r1) + ld r3,GPR3(r1) + ld r13,GPR13(r1) ld r1,GPR1(r1) - mtlr r4 - mtcr r5 - mtspr SPRN_SRR0,r7 - mtspr SPRN_SRR1,r8 RFI_TO_USER b . /* prevent speculative execution */ -1: /* exit to kernel */ - kuap_restore_amr r2 - - ld r2,GPR2(r1) - ld r1,GPR1(r1) - mtlr r4 - mtcr r5 - mtspr SPRN_SRR0,r7 - mtspr SPRN_SRR1,r8 - RFI_TO_KERNEL - b . /* prevent speculative execution */ - -.Lsyscall_error: - oris r5,r5,0x1000 /* Set SO bit in CR */ - neg r3,r3 - std r5,_CCR(r1) - b .Lsyscall_error_cont - -/* Traced system call support */ -.Lsyscall_dotrace: - addi r3,r1,STACK_FRAME_OVERHEAD - bl do_syscall_trace_enter - - /* - * We use the return value of do_syscall_trace_enter() as the syscall - * number. If the syscall was rejected for any reason do_syscall_trace_enter() - * returns an invalid syscall number and the test below against - * NR_syscalls will fail. - */ - mr r0,r3 - - /* Restore argument registers just clobbered and/or possibly changed. */ - ld r3,GPR3(r1) - ld r4,GPR4(r1) - ld r5,GPR5(r1) - ld r6,GPR6(r1) - ld r7,GPR7(r1) - ld r8,GPR8(r1) - - /* Repopulate r9 and r10 for the syscall path */ - addi r9,r1,STACK_FRAME_OVERHEAD - ld r10, PACA_THREAD_INFO(r13) - ld r10,TI_FLAGS(r10) - - cmpldi r0,NR_syscalls - blt+ .Lsyscall - - /* Return code is already in r3 thanks to do_syscall_trace_enter() */ - b .Lsyscall_exit - - -.Lsyscall_enosys: - li r3,-ENOSYS - b .Lsyscall_exit - -.Lsyscall_exit_work: - /* If TIF_RESTOREALL is set, don't scribble on either r3 or ccr. - If TIF_NOERROR is set, just save r3 as it is. */ - - andi. r0,r9,_TIF_RESTOREALL - beq+ 0f +.Lsyscall_restore_regs: + ld r3,_CTR(r1) + ld r4,_XER(r1) REST_NVGPRS(r1) - b 2f -0: cmpld r3,r11 /* r11 is -MAX_ERRNO */ - blt+ 1f - andi. r0,r9,_TIF_NOERROR - bne- 1f - ld r5,_CCR(r1) - neg r3,r3 - oris r5,r5,0x1000 /* Set SO bit in CR */ - std r5,_CCR(r1) -1: std r3,GPR3(r1) -2: andi. r0,r9,(_TIF_PERSYSCALL_MASK) - beq 4f - - /* Clear per-syscall TIF flags if any are set. */ - - li r11,_TIF_PERSYSCALL_MASK - addi r12,r12,TI_FLAGS -3: ldarx r10,0,r12 - andc r10,r10,r11 - stdcx. r10,0,r12 - bne- 3b - subi r12,r12,TI_FLAGS - -4: /* Anything else left to do? */ -BEGIN_FTR_SECTION - lis r3,DEFAULT_PPR@highest /* Set default PPR */ - sldi r3,r3,32 /* bits 11-13 are used for ppr */ - std r3,_PPR(r1) -END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) - - andi. r0,r9,(_TIF_SYSCALL_DOTRACE|_TIF_SINGLESTEP) - beq ret_from_except_lite - - /* Re-enable interrupts */ -#ifdef CONFIG_PPC_BOOK3E - wrteei 1 -#else - li r10,MSR_RI - ori r10,r10,MSR_EE - mtmsrd r10,1 -#endif /* CONFIG_PPC_BOOK3E */ - - addi r3,r1,STACK_FRAME_OVERHEAD - bl do_syscall_trace_leave - b ret_from_except + mtctr r3 + mtspr SPRN_XER,r4 + ld r0,GPR0(r1) + REST_8GPRS(4, r1) + ld r12,GPR12(r1) + b .Lsyscall_restore_regs_cont #ifdef CONFIG_PPC_TRANSACTIONAL_MEM .Ltabort_syscall: @@ -438,8 +196,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) RFI_TO_USER b . /* prevent speculative execution */ #endif -_ASM_NOKPROBE_SYMBOL(system_call_common); -_ASM_NOKPROBE_SYMBOL(system_call_exit); _GLOBAL(ret_from_fork) bl schedule_tail diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h index 8004336..d396efc 100644 --- a/arch/powerpc/kernel/signal.h +++ b/arch/powerpc/kernel/signal.h @@ -10,8 +10,6 @@ #ifndef _POWERPC_ARCH_SIGNAL_H #define _POWERPC_ARCH_SIGNAL_H -extern void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags); - extern void __user *get_sigframe(struct ksignal *ksig, unsigned long sp, size_t frame_size, int is_32); diff --git a/arch/powerpc/kernel/syscall_64.c b/arch/powerpc/kernel/syscall_64.c new file mode 100644 index 0000000..75be20f --- /dev/null +++ b/arch/powerpc/kernel/syscall_64.c @@ -0,0 +1,214 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +typedef long (*syscall_fn)(long, long, long, long, long, long); + +/* Has to run notrace because it is entered "unreconciled" */ +notrace long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, + unsigned long r0, struct pt_regs *regs) +{ + unsigned long ti_flags; + syscall_fn f; + + BUG_ON(!(regs->msr & MSR_PR)); + + account_cpu_user_entry(); + +#ifdef CONFIG_PPC_SPLPAR + if (IS_ENABLED(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && + firmware_has_feature(FW_FEATURE_SPLPAR)) { + struct lppaca *lp = local_paca->lppaca_ptr; + + if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx))) + accumulate_stolen_time(); + } +#endif + + kuap_check_amr(); + + /* + * A syscall should always be called with interrupts enabled + * so we just unconditionally hard-enable here. When some kind + * of irq tracing is used, we additionally check that condition + * is correct + */ + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) { + WARN_ON(irq_soft_mask_return() != IRQS_ENABLED); + WARN_ON(local_paca->irq_happened); + } + /* + * This is not required for the syscall exit path, but makes the + * stack frame look nicer. If this was initialised in the first stack + * frame, or if the unwinder was taught the first stack frame always + * returns to user with IRQS_ENABLED, this store could be avoided! + */ + regs->softe = IRQS_ENABLED; + + __hard_irq_enable(); + + ti_flags = current_thread_info()->flags; + if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) { + /* + * We use the return value of do_syscall_trace_enter() as the + * syscall number. If the syscall was rejected for any reason + * do_syscall_trace_enter() returns an invalid syscall number + * and the test against NR_syscalls will fail and the return + * value to be used is in regs->gpr[3]. + */ + r0 = do_syscall_trace_enter(regs); + if (unlikely(r0 >= NR_syscalls)) + return regs->gpr[3]; + r3 = regs->gpr[3]; + r4 = regs->gpr[4]; + r5 = regs->gpr[5]; + r6 = regs->gpr[6]; + r7 = regs->gpr[7]; + r8 = regs->gpr[8]; + + } else if (unlikely(r0 >= NR_syscalls)) { + return -ENOSYS; + } + + /* May be faster to do array_index_nospec? */ + barrier_nospec(); + + if (unlikely(ti_flags & _TIF_32BIT)) { + f = (void *)compat_sys_call_table[r0]; + + r3 &= 0x00000000ffffffffULL; + r4 &= 0x00000000ffffffffULL; + r5 &= 0x00000000ffffffffULL; + r6 &= 0x00000000ffffffffULL; + r7 &= 0x00000000ffffffffULL; + r8 &= 0x00000000ffffffffULL; + + } else { + f = (void *)sys_call_table[r0]; + } + + return f(r3, r4, r5, r6, r7, r8); +} + +/* + * This should be called after a syscall returns, with r3 the return value + * from the syscall. If this function returns non-zero, the system call + * exit assembly should additionally load all GPR registers and CTR and XER + * from the interrupt frame. + * + * The function graph tracer can not trace the return side of this function, + * because RI=0 and soft mask state is "unreconciled", so it is marked notrace. + */ +notrace unsigned long syscall_exit_prepare(unsigned long r3, + struct pt_regs *regs) +{ + unsigned long *ti_flagsp = ¤t_thread_info()->flags; + unsigned long ti_flags; + unsigned long ret = 0; + + regs->result = r3; + + /* Check whether the syscall is issued inside a restartable sequence */ + rseq_syscall(regs); + + ti_flags = *ti_flagsp; + + if (unlikely(r3 >= (unsigned long)-MAX_ERRNO)) { + if (likely(!(ti_flags & (_TIF_NOERROR | _TIF_RESTOREALL)))) { + r3 = -r3; + regs->ccr |= 0x10000000; /* Set SO bit in CR */ + } + } + + if (unlikely(ti_flags & _TIF_PERSYSCALL_MASK)) { + if (ti_flags & _TIF_RESTOREALL) + ret = _TIF_RESTOREALL; + else + regs->gpr[3] = r3; + clear_bits(_TIF_PERSYSCALL_MASK, ti_flagsp); + } else { + regs->gpr[3] = r3; + } + + if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) { + do_syscall_trace_leave(regs); + ret |= _TIF_RESTOREALL; + } + +again: + local_irq_disable(); + ti_flags = READ_ONCE(*ti_flagsp); + while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) { + local_irq_enable(); + if (ti_flags & _TIF_NEED_RESCHED) { + schedule(); + } else { + /* + * SIGPENDING must restore signal handler function + * argument GPRs, and some non-volatiles (e.g., r1). + * Restore all for now. This could be made lighter. + */ + if (ti_flags & _TIF_SIGPENDING) + ret |= _TIF_RESTOREALL; + do_notify_resume(regs, ti_flags); + } + local_irq_disable(); + ti_flags = READ_ONCE(*ti_flagsp); + } + + if (IS_ENABLED(CONFIG_PPC_BOOK3S) && IS_ENABLED(CONFIG_PPC_FPU)) { + if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) && + unlikely((ti_flags & _TIF_RESTORE_TM))) { + restore_tm_state(regs); + } else { + unsigned long mathflags = MSR_FP; + + if (cpu_has_feature(CPU_FTR_VSX)) + mathflags |= MSR_VEC | MSR_VSX; + else if (cpu_has_feature(CPU_FTR_ALTIVEC)) + mathflags |= MSR_VEC; + + if ((regs->msr & mathflags) != mathflags) + restore_math(regs); + } + } + + /* This must be done with RI=1 because tracing may touch vmaps */ + trace_hardirqs_on(); + + /* This pattern matches prep_irq_for_idle */ + __hard_EE_RI_disable(); + if (unlikely(lazy_irq_pending())) { + __hard_RI_enable(); + trace_hardirqs_off(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + local_irq_enable(); + /* Took an interrupt which may have more exit work to do. */ + goto again; + } + local_paca->irq_happened = 0; + irq_soft_mask_set(IRQS_ENABLED); + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + local_paca->tm_scratch = regs->msr; +#endif + + kuap_check_amr(); + + account_cpu_user_exit(); + + return ret; +} diff --git a/arch/powerpc/kernel/systbl.S b/arch/powerpc/kernel/systbl.S index 5b905a2..d34276f 100644 --- a/arch/powerpc/kernel/systbl.S +++ b/arch/powerpc/kernel/systbl.S @@ -16,25 +16,22 @@ #ifdef CONFIG_PPC64 .p2align 3 +#define __SYSCALL(nr, entry) .8byte entry +#else +#define __SYSCALL(nr, entry) .long entry #endif .globl sys_call_table sys_call_table: #ifdef CONFIG_PPC64 -#define __SYSCALL(nr, entry) .8byte DOTSYM(entry) #include -#undef __SYSCALL #else -#define __SYSCALL(nr, entry) .long entry #include -#undef __SYSCALL #endif #ifdef CONFIG_COMPAT .globl compat_sys_call_table compat_sys_call_table: #define compat_sys_sigsuspend sys_sigsuspend -#define __SYSCALL(nr, entry) .8byte DOTSYM(entry) #include -#undef __SYSCALL #endif