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author | Paul Mundt <lethal@linux-sh.org> | 2009-08-04 17:14:39 +0900 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2009-08-04 17:14:39 +0900 |
commit | c7914834ef3b8a396b7e82ea34ac07cdcfe6f868 (patch) | |
tree | 59f6f76dfca96cd7ad330ae3c281cfa57e98f44e | |
parent | c0fe478dbb14fd32e71d1383dbe302b54ce94134 (diff) | |
download | linux-c7914834ef3b8a396b7e82ea34ac07cdcfe6f868.tar.gz linux-c7914834ef3b8a396b7e82ea34ac07cdcfe6f868.tar.bz2 linux-c7914834ef3b8a396b7e82ea34ac07cdcfe6f868.zip |
sh: Tidy up NEFF-based sign extension for SH-5.
This consolidates all of the NEFF-based sign extension for SH-5.
In the future the other SH code will need to make use of this as well,
so make it generic in preparation for more 32/64 consolidation.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
-rw-r--r-- | arch/sh/include/asm/pgtable.h | 6 | ||||
-rw-r--r-- | arch/sh/kernel/process_64.c | 24 | ||||
-rw-r--r-- | arch/sh/kernel/signal_64.c | 38 | ||||
-rw-r--r-- | arch/sh/mm/fault_64.c | 11 | ||||
-rw-r--r-- | arch/sh/mm/tlb-sh5.c | 21 | ||||
-rw-r--r-- | arch/sh/mm/tlbflush_64.c | 2 |
6 files changed, 36 insertions, 66 deletions
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h index 43ef3e99fdd1..3cd7127af957 100644 --- a/arch/sh/include/asm/pgtable.h +++ b/arch/sh/include/asm/pgtable.h @@ -36,6 +36,12 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #define NEFF_SIGN (1LL << (NEFF - 1)) #define NEFF_MASK (-1LL << NEFF) +static inline unsigned long long neff_sign_extend(unsigned long val) +{ + unsigned long long extended = val; + return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended; +} + #ifdef CONFIG_29BIT #define NPHYS 29 #else diff --git a/arch/sh/kernel/process_64.c b/arch/sh/kernel/process_64.c index 24de74214940..1192398ef582 100644 --- a/arch/sh/kernel/process_64.c +++ b/arch/sh/kernel/process_64.c @@ -425,7 +425,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, struct task_struct *p, struct pt_regs *regs) { struct pt_regs *childregs; - unsigned long long se; /* Sign extension */ #ifdef CONFIG_SH_FPU if(last_task_used_math == current) { @@ -441,11 +440,19 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, *childregs = *regs; + /* + * Sign extend the edited stack. + * Note that thread.pc and thread.pc will stay + * 32-bit wide and context switch must take care + * of NEFF sign extension. + */ if (user_mode(regs)) { - childregs->regs[15] = usp; + childregs->regs[15] = neff_sign_extend(usp); p->thread.uregs = childregs; } else { - childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE; + childregs->regs[15] = + neff_sign_extend((unsigned long)task_stack_page(p) + + THREAD_SIZE); } childregs->regs[9] = 0; /* Set return value for child */ @@ -454,17 +461,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->thread.sp = (unsigned long) childregs; p->thread.pc = (unsigned long) ret_from_fork; - /* - * Sign extend the edited stack. - * Note that thread.pc and thread.pc will stay - * 32-bit wide and context switch must take care - * of NEFF sign extension. - */ - - se = childregs->regs[15]; - se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se; - childregs->regs[15] = se; - return 0; } diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c index 0663a0ee6021..026fd1cfe17d 100644 --- a/arch/sh/kernel/signal_64.c +++ b/arch/sh/kernel/signal_64.c @@ -561,13 +561,11 @@ static int setup_frame(int sig, struct k_sigaction *ka, /* Set up to return from userspace. If provided, use a stub already in userspace. */ if (ka->sa.sa_flags & SA_RESTORER) { - DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; - /* * On SH5 all edited pointers are subject to NEFF */ - DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? - (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; + DEREF_REG_PR = neff_sign_extend((unsigned long) + ka->sa.sa_restorer | 0x1); } else { /* * Different approach on SH5. @@ -580,9 +578,8 @@ static int setup_frame(int sig, struct k_sigaction *ka, * . being code, linker turns ShMedia bit on, always * dereference index -1. */ - DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; - DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? - (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; + DEREF_REG_PR = neff_sign_extend((unsigned long) + frame->retcode | 0x01); if (__copy_to_user(frame->retcode, (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0) @@ -596,9 +593,7 @@ static int setup_frame(int sig, struct k_sigaction *ka, * Set up registers for signal handler. * All edited pointers are subject to NEFF. */ - regs->regs[REG_SP] = (unsigned long) frame; - regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? - (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; + regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame); regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ /* FIXME: @@ -613,8 +608,7 @@ static int setup_frame(int sig, struct k_sigaction *ka, regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc; regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc; - regs->pc = (unsigned long) ka->sa.sa_handler; - regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; + regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler); set_fs(USER_DS); @@ -676,13 +670,11 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, /* Set up to return from userspace. If provided, use a stub already in userspace. */ if (ka->sa.sa_flags & SA_RESTORER) { - DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; - /* * On SH5 all edited pointers are subject to NEFF */ - DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? - (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; + DEREF_REG_PR = neff_sign_extend((unsigned long) + ka->sa.sa_restorer | 0x1); } else { /* * Different approach on SH5. @@ -695,15 +687,14 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, * . being code, linker turns ShMedia bit on, always * dereference index -1. */ - - DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; - DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? - (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; + DEREF_REG_PR = neff_sign_extend((unsigned long) + frame->retcode | 0x01); if (__copy_to_user(frame->retcode, (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0) goto give_sigsegv; + /* Cohere the trampoline with the I-cache. */ flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15); } @@ -711,14 +702,11 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, * Set up registers for signal handler. * All edited pointers are subject to NEFF. */ - regs->regs[REG_SP] = (unsigned long) frame; - regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? - (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; + regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame); regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info; regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext; - regs->pc = (unsigned long) ka->sa.sa_handler; - regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; + regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler); set_fs(USER_DS); diff --git a/arch/sh/mm/fault_64.c b/arch/sh/mm/fault_64.c index bd63b961b2a9..2b356cec2489 100644 --- a/arch/sh/mm/fault_64.c +++ b/arch/sh/mm/fault_64.c @@ -56,16 +56,7 @@ inline void __do_tlb_refill(unsigned long address, /* * Set PTEH register */ - pteh = address & MMU_VPN_MASK; - - /* Sign extend based on neff. */ -#if (NEFF == 32) - /* Faster sign extension */ - pteh = (unsigned long long)(signed long long)(signed long)pteh; -#else - /* General case */ - pteh = (pteh & NEFF_SIGN) ? (pteh | NEFF_MASK) : pteh; -#endif + pteh = neff_sign_extend(address & MMU_VPN_MASK); /* Set the ASID. */ pteh |= get_asid() << PTEH_ASID_SHIFT; diff --git a/arch/sh/mm/tlb-sh5.c b/arch/sh/mm/tlb-sh5.c index dae131243bcc..fdb64e41ec50 100644 --- a/arch/sh/mm/tlb-sh5.c +++ b/arch/sh/mm/tlb-sh5.c @@ -117,26 +117,15 @@ int sh64_put_wired_dtlb_entry(unsigned long long entry) * Load up a virtual<->physical translation for @eaddr<->@paddr in the * pre-allocated TLB slot @config_addr (see sh64_get_wired_dtlb_entry). */ -inline void sh64_setup_tlb_slot(unsigned long long config_addr, - unsigned long eaddr, - unsigned long asid, - unsigned long paddr) +void sh64_setup_tlb_slot(unsigned long long config_addr, unsigned long eaddr, + unsigned long asid, unsigned long paddr) { unsigned long long pteh, ptel; - /* Sign extension */ -#if (NEFF == 32) - pteh = (unsigned long long)(signed long long)(signed long) eaddr; -#else -#error "Can't sign extend more than 32 bits yet" -#endif + pteh = neff_sign_extend(eaddr); pteh &= PAGE_MASK; pteh |= (asid << PTEH_ASID_SHIFT) | PTEH_VALID; -#if (NEFF == 32) - ptel = (unsigned long long)(signed long long)(signed long) paddr; -#else -#error "Can't sign extend more than 32 bits yet" -#endif + ptel = neff_sign_extend(paddr); ptel &= PAGE_MASK; ptel |= (_PAGE_CACHABLE | _PAGE_READ | _PAGE_WRITE); @@ -152,5 +141,5 @@ inline void sh64_setup_tlb_slot(unsigned long long config_addr, * * Teardown any existing mapping in the TLB slot @config_addr. */ -inline void sh64_teardown_tlb_slot(unsigned long long config_addr) +void sh64_teardown_tlb_slot(unsigned long long config_addr) __attribute__ ((alias("__flush_tlb_slot"))); diff --git a/arch/sh/mm/tlbflush_64.c b/arch/sh/mm/tlbflush_64.c index f2e44e9ffb75..fa5a95a062d0 100644 --- a/arch/sh/mm/tlbflush_64.c +++ b/arch/sh/mm/tlbflush_64.c @@ -337,7 +337,7 @@ void local_flush_tlb_one(unsigned long asid, unsigned long page) /* * Sign-extend based on neff. */ - lpage = (page & NEFF_SIGN) ? (page | NEFF_MASK) : page; + lpage = neff_sign_extend(page); match = (asid << PTEH_ASID_SHIFT) | PTEH_VALID; match |= lpage; |