diff options
author | Arnd Bergmann <arnd@arndb.de> | 2022-02-11 17:19:14 +0100 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2022-02-25 09:36:06 +0100 |
commit | a5ad837843b63d4f0d90b5cd74dc8bc25a291cfd (patch) | |
tree | 47e2d070e3cc549ab8c5cd43961f4630156a85d6 /arch/sparc | |
parent | 5a06fcb15b43d1f7bf740c672950122331cb5655 (diff) |
sparc64: remove CONFIG_SET_FS support
sparc64 uses address space identifiers to differentiate between kernel
and user space, using ASI_P for kernel threads but ASI_AIUS for normal
user space, with the option of changing between them.
As nothing really changes the ASI any more, just hardcode ASI_AIUS
everywhere. Kernel threads are not allowed to access __user pointers
anyway.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/sparc')
-rw-r--r-- | arch/sparc/Kconfig | 2 | ||||
-rw-r--r-- | arch/sparc/include/asm/processor_64.h | 4 | ||||
-rw-r--r-- | arch/sparc/include/asm/switch_to_64.h | 4 | ||||
-rw-r--r-- | arch/sparc/include/asm/thread_info_64.h | 4 | ||||
-rw-r--r-- | arch/sparc/include/asm/uaccess_64.h | 20 | ||||
-rw-r--r-- | arch/sparc/kernel/process_64.c | 12 | ||||
-rw-r--r-- | arch/sparc/kernel/traps_64.c | 2 | ||||
-rw-r--r-- | arch/sparc/lib/NGmemcpy.S | 3 | ||||
-rw-r--r-- | arch/sparc/mm/init_64.c | 7 |
9 files changed, 9 insertions, 49 deletions
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 9f6f9bce5292..602149f3957f 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -46,7 +46,6 @@ config SPARC select LOCKDEP_SMALL if LOCKDEP select NEED_DMA_MAP_STATE select NEED_SG_DMA_LENGTH - select SET_FS select TRACE_IRQFLAGS_SUPPORT config SPARC32 @@ -59,6 +58,7 @@ config SPARC32 select HAVE_UID16 select OLD_SIGACTION select ZONE_DMA + select SET_FS config SPARC64 def_bool 64BIT diff --git a/arch/sparc/include/asm/processor_64.h b/arch/sparc/include/asm/processor_64.h index ae851e8fce4c..89850dff6b03 100644 --- a/arch/sparc/include/asm/processor_64.h +++ b/arch/sparc/include/asm/processor_64.h @@ -47,10 +47,6 @@ #ifndef __ASSEMBLY__ -typedef struct { - unsigned char seg; -} mm_segment_t; - /* The Sparc processor specific thread struct. */ /* XXX This should die, everything can go into thread_info now. */ struct thread_struct { diff --git a/arch/sparc/include/asm/switch_to_64.h b/arch/sparc/include/asm/switch_to_64.h index b1d4e2e3210f..14f3c49bfdbc 100644 --- a/arch/sparc/include/asm/switch_to_64.h +++ b/arch/sparc/include/asm/switch_to_64.h @@ -20,10 +20,8 @@ do { \ */ #define switch_to(prev, next, last) \ do { save_and_clear_fpu(); \ - /* If you are tempted to conditionalize the following */ \ - /* so that ASI is only written if it changes, think again. */ \ __asm__ __volatile__("wr %%g0, %0, %%asi" \ - : : "r" (task_thread_info(next)->current_ds));\ + : : "r" (ASI_AIUS)); \ trap_block[current_thread_info()->cpu].thread = \ task_thread_info(next); \ __asm__ __volatile__( \ diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h index 8047a9caab2f..1a44372e2bc0 100644 --- a/arch/sparc/include/asm/thread_info_64.h +++ b/arch/sparc/include/asm/thread_info_64.h @@ -46,7 +46,7 @@ struct thread_info { struct pt_regs *kregs; int preempt_count; /* 0 => preemptable, <0 => BUG */ __u8 new_child; - __u8 current_ds; + __u8 __pad; __u16 cpu; unsigned long *utraps; @@ -81,7 +81,6 @@ struct thread_info { #define TI_KREGS 0x00000028 #define TI_PRE_COUNT 0x00000030 #define TI_NEW_CHILD 0x00000034 -#define TI_CURRENT_DS 0x00000035 #define TI_CPU 0x00000036 #define TI_UTRAPS 0x00000038 #define TI_REG_WINDOW 0x00000040 @@ -116,7 +115,6 @@ struct thread_info { #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ - .current_ds = ASI_P, \ .preempt_count = INIT_PREEMPT_COUNT, \ .kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \ } diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index 59b9a545df23..94266a5c5b04 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h @@ -12,33 +12,15 @@ #include <asm/spitfire.h> #include <asm/processor.h> +#include <asm-generic/access_ok.h> /* * Sparc64 is segmented, though more like the M68K than the I386. * We use the secondary ASI to address user memory, which references a * completely different VM map, thus there is zero chance of the user * doing something queer and tricking us into poking kernel memory. - * - * What is left here is basically what is needed for the other parts of - * the kernel that expect to be able to manipulate, erum, "segments". - * Or perhaps more properly, permissions. - * - * "For historical reasons, these macros are grossly misnamed." -Linus */ -#define KERNEL_DS ((mm_segment_t) { ASI_P }) -#define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */ - -#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)}) - -#include <asm-generic/access_ok.h> - -#define set_fs(val) \ -do { \ - current_thread_info()->current_ds = (val).seg; \ - __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \ -} while(0) - /* * Test whether a block of memory is a valid user space address. * Returns 0 if the range is valid, nonzero otherwise. diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index f5b2cac8669f..9a2ceb080ac9 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -106,18 +106,13 @@ static void show_regwindow32(struct pt_regs *regs) { struct reg_window32 __user *rw; struct reg_window32 r_w; - mm_segment_t old_fs; __asm__ __volatile__ ("flushw"); rw = compat_ptr((unsigned int)regs->u_regs[14]); - old_fs = get_fs(); - set_fs (USER_DS); if (copy_from_user (&r_w, rw, sizeof(r_w))) { - set_fs (old_fs); return; } - set_fs (old_fs); printk("l0: %08x l1: %08x l2: %08x l3: %08x " "l4: %08x l5: %08x l6: %08x l7: %08x\n", r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], @@ -136,7 +131,6 @@ static void show_regwindow(struct pt_regs *regs) struct reg_window __user *rw; struct reg_window *rwk; struct reg_window r_w; - mm_segment_t old_fs; if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { __asm__ __volatile__ ("flushw"); @@ -145,14 +139,10 @@ static void show_regwindow(struct pt_regs *regs) rwk = (struct reg_window *) (regs->u_regs[14] + STACK_BIAS); if (!(regs->tstate & TSTATE_PRIV)) { - old_fs = get_fs(); - set_fs (USER_DS); if (copy_from_user (&r_w, rw, sizeof(r_w))) { - set_fs (old_fs); return; } rwk = &r_w; - set_fs (old_fs); } } else { show_regwindow32(regs); @@ -598,7 +588,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg, memset(child_trap_frame, 0, child_stack_sz); __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = (current_pt_regs()->tstate + 1) & TSTATE_CWP; - t->current_ds = ASI_P; t->kregs->u_regs[UREG_G1] = sp; /* function */ t->kregs->u_regs[UREG_G2] = arg; return 0; @@ -613,7 +602,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg, t->kregs->u_regs[UREG_FP] = sp; __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = (regs->tstate + 1) & TSTATE_CWP; - t->current_ds = ASI_AIUS; if (sp != regs->u_regs[UREG_FP]) { unsigned long csp; diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c index 21077821f427..5b4de4a89dec 100644 --- a/arch/sparc/kernel/traps_64.c +++ b/arch/sparc/kernel/traps_64.c @@ -2857,8 +2857,6 @@ void __init trap_init(void) TI_PRE_COUNT != offsetof(struct thread_info, preempt_count) || TI_NEW_CHILD != offsetof(struct thread_info, new_child) || - TI_CURRENT_DS != offsetof(struct thread_info, - current_ds) || TI_KUNA_REGS != offsetof(struct thread_info, kern_una_regs) || TI_KUNA_INSN != offsetof(struct thread_info, diff --git a/arch/sparc/lib/NGmemcpy.S b/arch/sparc/lib/NGmemcpy.S index 8e4d22a6ba0b..ee51c1230689 100644 --- a/arch/sparc/lib/NGmemcpy.S +++ b/arch/sparc/lib/NGmemcpy.S @@ -10,8 +10,7 @@ #include <asm/thread_info.h> #define GLOBAL_SPARE %g7 #define RESTORE_ASI(TMP) \ - ldub [%g6 + TI_CURRENT_DS], TMP; \ - wr TMP, 0x0, %asi; + wr %g0, ASI_AIUS, %asi #else #define GLOBAL_SPARE %g5 #define RESTORE_ASI(TMP) \ diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 1b23639e2fcd..8b1911591581 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -709,9 +709,10 @@ static void __init inherit_prom_mappings(void) void prom_world(int enter) { - if (!enter) - set_fs(get_fs()); - + /* + * No need to change the address space any more, just flush + * the register windows + */ __asm__ __volatile__("flushw"); } |