From: David S. Miller Date: Thu, 24 Apr 2008 10:15:22 +0000 (-0700) Subject: [SPARC64]: %l6 trap return handling no longer necessary. X-Git-Tag: v2.6.26-rc1~1089^2~2 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=7697daaa894ca2bc5cd652269c316bcdc3ec441b;p=linux-2.6-omap-h63xx.git [SPARC64]: %l6 trap return handling no longer necessary. Now that we indicate the "restart system call" in the trap type field of pt_regs->magic, we don't need to set the %l6 boolean in all of the trap return paths. And we therefore don't need to pass it to do_notify_resume(). Signed-off-by: David S. Miller --- diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S index f54cd2dd55d..fd06e937ae1 100644 --- a/arch/sparc64/kernel/entry.S +++ b/arch/sparc64/kernel/entry.S @@ -47,7 +47,7 @@ do_fpdis: ba,pt %xcc, etrap 109: or %g7, %lo(109b), %g7 add %g0, %g0, %g0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap 1: TRAP_LOAD_THREAD_REG(%g6, %g1) ldub [%g6 + TI_FPSAVED], %g5 @@ -226,7 +226,7 @@ fp_other_bounce: call do_fpother add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop .globl do_fpother_check_fitos .align 32 @@ -489,7 +489,7 @@ utrap_trap: /* %g3=handler,%g4=level */ call bad_trap add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop invoke_utrap: sllx %g3, 3, %g3 @@ -607,7 +607,7 @@ __spitfire_cee_trap_continue: call spitfire_access_error add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop /* This is the trap handler entry point for ECC correctable * errors. They are corrected, but we listen for the trap @@ -686,7 +686,7 @@ __spitfire_data_access_exception_tl1: call spitfire_data_access_exception_tl1 add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop __spitfire_data_access_exception: rdpr %pstate, %g4 @@ -705,7 +705,7 @@ __spitfire_data_access_exception: call spitfire_data_access_exception add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop .globl __spitfire_insn_access_exception .globl __spitfire_insn_access_exception_tl1 @@ -725,7 +725,7 @@ __spitfire_insn_access_exception_tl1: call spitfire_insn_access_exception_tl1 add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop __spitfire_insn_access_exception: rdpr %pstate, %g4 @@ -743,7 +743,7 @@ __spitfire_insn_access_exception: call spitfire_insn_access_exception add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop /* These get patched into the trap table at boot time * once we know we have a cheetah processor. @@ -937,7 +937,7 @@ do_dcpe_tl1_fatal: call cheetah_plus_parity_error add %sp, PTREGS_OFF, %o1 ba,pt %xcc, rtrap - clr %l6 + nop do_icpe_tl1: rdpr %tl, %g1 ! Save original trap level @@ -979,7 +979,7 @@ do_icpe_tl1_fatal: call cheetah_plus_parity_error add %sp, PTREGS_OFF, %o1 ba,pt %xcc, rtrap - clr %l6 + nop dcpe_icpe_tl1_common: /* Flush D-cache, re-enable D/I caches in DCU and finally @@ -1281,7 +1281,7 @@ __do_privact: call do_privact add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop .globl do_mna do_mna: @@ -1308,7 +1308,7 @@ do_mna: call mem_address_unaligned add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop .globl do_lddfmna do_lddfmna: @@ -1326,7 +1326,7 @@ do_lddfmna: call handle_lddfmna add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop .globl do_stdfmna do_stdfmna: @@ -1344,7 +1344,7 @@ do_stdfmna: call handle_stdfmna add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap - clr %l6 + nop .globl breakpoint_trap breakpoint_trap: @@ -1424,13 +1424,13 @@ sys32_rt_sigreturn: 1: ldx [%curptr + TI_FLAGS], %l5 andcc %l5, (_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT), %g0 be,pt %icc, rtrap - clr %l6 + nop add %sp, PTREGS_OFF, %o0 call syscall_trace mov 1, %o1 ba,pt %xcc, rtrap - clr %l6 + nop /* This is how fork() was meant to be done, 8 instruction entry. * @@ -1605,7 +1605,7 @@ ret_sys_call: bne,pn %icc, linux_syscall_trace2 add %l1, 0x4, %l2 ! npc = npc+4 stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC] - ba,pt %xcc, rtrap_clr_l6 + ba,pt %xcc, rtrap stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC] 1: @@ -1616,7 +1616,6 @@ ret_sys_call: sub %g0, %o0, %o0 or %g3, %g2, %g3 stx %o0, [%sp + PTREGS_OFF + PT_V9_I0] - mov 1, %l6 stx %g3, [%sp + PTREGS_OFF + PT_V9_TSTATE] bne,pn %icc, linux_syscall_trace2 add %l1, 0x4, %l2 ! npc = npc+4 diff --git a/arch/sparc64/kernel/entry.h b/arch/sparc64/kernel/entry.h index 4a91e9c6d31..32fbab62085 100644 --- a/arch/sparc64/kernel/entry.h +++ b/arch/sparc64/kernel/entry.h @@ -20,7 +20,6 @@ extern void timer_interrupt(int irq, struct pt_regs *regs); extern void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, - int restart_syscall, unsigned long thread_info_flags); extern asmlinkage void syscall_trace(struct pt_regs *regs, diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S index 079d18a11d2..ecf6753b204 100644 --- a/arch/sparc64/kernel/rtrap.S +++ b/arch/sparc64/kernel/rtrap.S @@ -18,12 +18,6 @@ #define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV) #define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG) - /* Register %l6 keeps track of whether we are returning - * from a system call or not. It is cleared if we call - * do_notify_resume, and it must not be otherwise modified - * until we fully commit to returning to userspace. - */ - .text .align 32 __handle_softirq: @@ -56,14 +50,12 @@ __handle_user_windows: be,pt %xcc, __handle_user_windows_continue nop mov %l5, %o1 - mov %l6, %o2 add %sp, PTREGS_OFF, %o0 - mov %l0, %o3 + mov %l0, %o2 call do_notify_resume wrpr %g0, RTRAP_PSTATE, %pstate wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate - clr %l6 /* Signal delivery can modify pt_regs tstate, so we must * reload it. */ @@ -99,14 +91,12 @@ __handle_perfctrs: be,pt %xcc, __handle_perfctrs_continue sethi %hi(TSTATE_PEF), %o0 mov %l5, %o1 - mov %l6, %o2 add %sp, PTREGS_OFF, %o0 - mov %l0, %o3 + mov %l0, %o2 call do_notify_resume wrpr %g0, RTRAP_PSTATE, %pstate wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate - clr %l6 /* Signal delivery can modify pt_regs tstate, so we must * reload it. */ @@ -127,13 +117,11 @@ __handle_userfpu: __handle_signal: mov %l5, %o1 - mov %l6, %o2 add %sp, PTREGS_OFF, %o0 - mov %l0, %o3 + mov %l0, %o2 call do_notify_resume wrpr %g0, RTRAP_PSTATE, %pstate wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate - clr %l6 /* Signal delivery can modify pt_regs tstate, so we must * reload it. @@ -145,9 +133,8 @@ __handle_signal: andn %l1, %l4, %l1 .align 64 - .globl rtrap_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall + .globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall rtrap_irq: -rtrap_clr_l6: clr %l6 rtrap: #ifndef CONFIG_SMP sethi %hi(per_cpu____cpu_data), %l0 diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c index b959597201e..77a3e8592cb 100644 --- a/arch/sparc64/kernel/signal.c +++ b/arch/sparc64/kernel/signal.c @@ -580,8 +580,7 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0) } } -void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall, - unsigned long thread_info_flags) +void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) { if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) do_signal(regs, orig_i0); diff --git a/arch/sparc64/kernel/sun4v_tlb_miss.S b/arch/sparc64/kernel/sun4v_tlb_miss.S index fd9430562e0..e1fbf8c7578 100644 --- a/arch/sparc64/kernel/sun4v_tlb_miss.S +++ b/arch/sparc64/kernel/sun4v_tlb_miss.S @@ -262,7 +262,7 @@ sun4v_iacc: mov %l5, %o2 call sun4v_insn_access_exception add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap /* Instruction Access Exception, tl1. */ sun4v_iacc_tl1: @@ -278,7 +278,7 @@ sun4v_iacc_tl1: mov %l5, %o2 call sun4v_insn_access_exception_tl1 add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap /* Data Access Exception, tl0. */ sun4v_dacc: @@ -294,7 +294,7 @@ sun4v_dacc: mov %l5, %o2 call sun4v_data_access_exception add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap /* Data Access Exception, tl1. */ sun4v_dacc_tl1: @@ -310,7 +310,7 @@ sun4v_dacc_tl1: mov %l5, %o2 call sun4v_data_access_exception_tl1 add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap /* Memory Address Unaligned. */ sun4v_mna: @@ -344,7 +344,7 @@ sun4v_mna: mov %l5, %o2 call sun4v_do_mna add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap /* Privileged Action. */ sun4v_privact: @@ -352,7 +352,7 @@ sun4v_privact: rd %pc, %g7 call do_privact add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap /* Unaligned ldd float, tl0. */ sun4v_lddfmna: @@ -368,7 +368,7 @@ sun4v_lddfmna: mov %l5, %o2 call handle_lddfmna add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap /* Unaligned std float, tl0. */ sun4v_stdfmna: @@ -384,7 +384,7 @@ sun4v_stdfmna: mov %l5, %o2 call handle_stdfmna add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap #define BRANCH_ALWAYS 0x10680000 #define NOP 0x01000000 diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S index 10adb2fb8ff..c499214b501 100644 --- a/arch/sparc64/kernel/tsb.S +++ b/arch/sparc64/kernel/tsb.S @@ -275,7 +275,7 @@ sparc64_realfault_common: stx %l5, [%g6 + TI_FAULT_ADDR] ! Save fault address call do_sparc64_fault ! Call fault handler add %sp, PTREGS_OFF, %o0 ! Compute pt_regs arg - ba,pt %xcc, rtrap_clr_l6 ! Restore cpu state + ba,pt %xcc, rtrap ! Restore cpu state nop ! Delay slot (fill me) winfix_trampoline: diff --git a/arch/sparc64/kernel/winfixup.S b/arch/sparc64/kernel/winfixup.S index c4aa110a10e..a6b0863c27d 100644 --- a/arch/sparc64/kernel/winfixup.S +++ b/arch/sparc64/kernel/winfixup.S @@ -32,7 +32,7 @@ fill_fixup: rd %pc, %g7 call do_sparc64_fault add %sp, PTREGS_OFF, %o0 - ba,pt %xcc, rtrap_clr_l6 + ba,pt %xcc, rtrap nop /* Be very careful about usage of the trap globals here. @@ -100,7 +100,7 @@ spill_fixup_dax: rd %pc, %g7 call do_sparc64_fault add %sp, PTREGS_OFF, %o0 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap winfix_mna: andn %g3, 0x7f, %g3 @@ -122,12 +122,12 @@ fill_fixup_mna: mov %l4, %o2 call sun4v_do_mna mov %l5, %o1 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap 1: mov %l4, %o1 mov %l5, %o2 call mem_address_unaligned nop - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap winfix_dax: andn %g3, 0x7f, %g3 @@ -150,7 +150,7 @@ fill_fixup_dax: add %sp, PTREGS_OFF, %o0 call sun4v_data_access_exception nop - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap 1: call spitfire_data_access_exception nop - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S index 2865c105b6a..e686a67561a 100644 --- a/arch/sparc64/mm/ultra.S +++ b/arch/sparc64/mm/ultra.S @@ -476,7 +476,6 @@ xcall_sync_tick: #endif call smp_synchronize_tick_client nop - clr %l6 b rtrap_xcall ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 @@ -511,7 +510,6 @@ xcall_report_regs: #endif call __show_regs add %sp, PTREGS_OFF, %o0 - clr %l6 /* Has to be a non-v9 branch due to the large distance. */ b rtrap_xcall ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 @@ -576,7 +574,7 @@ __hypervisor_tlb_xcall_error: mov %l4, %o0 call hypervisor_tlbop_error_xcall mov %l5, %o1 - ba,a,pt %xcc, rtrap_clr_l6 + ba,a,pt %xcc, rtrap .globl __hypervisor_xcall_flush_tlb_mm __hypervisor_xcall_flush_tlb_mm: /* 21 insns */ diff --git a/include/asm-sparc64/ttable.h b/include/asm-sparc64/ttable.h index 7208a777750..d3cc4eff39a 100644 --- a/include/asm-sparc64/ttable.h +++ b/include/asm-sparc64/ttable.h @@ -28,7 +28,7 @@ call routine; \ add %sp, PTREGS_OFF, %o0; \ ba,pt %xcc, rtrap; \ - clr %l6; \ + nop; \ nop; #define TRAP_7INSNS(routine) \ @@ -38,7 +38,7 @@ call routine; \ add %sp, PTREGS_OFF, %o0; \ ba,pt %xcc, rtrap; \ - clr %l6; + nop; #define TRAP_SAVEFPU(routine) \ sethi %hi(109f), %g7; \ @@ -47,7 +47,7 @@ call routine; \ add %sp, PTREGS_OFF, %o0; \ ba,pt %xcc, rtrap; \ - clr %l6; \ + nop; \ nop; #define TRAP_NOSAVE(routine) \ @@ -67,7 +67,7 @@ call routine; \ add %sp, PTREGS_OFF, %o0; \ ba,pt %xcc, rtrap; \ - clr %l6; \ + nop; \ nop; #define TRAP_ARG(routine, arg) \ @@ -78,7 +78,7 @@ call routine; \ mov arg, %o1; \ ba,pt %xcc, rtrap; \ - clr %l6; + nop; #define TRAPTL1_ARG(routine, arg) \ sethi %hi(109f), %g7; \ @@ -88,7 +88,7 @@ call routine; \ mov arg, %o1; \ ba,pt %xcc, rtrap; \ - clr %l6; + nop; #define SYSCALL_TRAP(routine, systbl) \ sethi %hi(109f), %g7; \ @@ -166,7 +166,7 @@ ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %l1; \ add %l1, 4, %l2; \ stx %l1, [%sp + PTREGS_OFF + PT_V9_TPC]; \ - ba,pt %xcc, rtrap_clr_l6; \ + ba,pt %xcc, rtrap; \ stx %l2, [%sp + PTREGS_OFF + PT_V9_TNPC]; #ifdef CONFIG_KPROBES