diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/hexagon/kernel/vm_entry.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/hexagon/kernel/vm_entry.S | 269 |
1 files changed, 0 insertions, 269 deletions
diff --git a/ANDROID_3.4.5/arch/hexagon/kernel/vm_entry.S b/ANDROID_3.4.5/arch/hexagon/kernel/vm_entry.S deleted file mode 100644 index 5b99066c..00000000 --- a/ANDROID_3.4.5/arch/hexagon/kernel/vm_entry.S +++ /dev/null @@ -1,269 +0,0 @@ -/* - * Event entry/exit for Hexagon - * - * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -#include <asm/asm-offsets.h> /* assembly-safer versions of C defines */ -#include <asm/mem-layout.h> /* sigh, except for page_offset */ -#include <asm/hexagon_vm.h> -#include <asm/thread_info.h> - -/* - * Entry into guest-mode Linux under Hexagon Virtual Machine. - * Stack pointer points to event record - build pt_regs on top of it, - * set up a plausible C stack frame, and dispatch to the C handler. - * On return, do vmrte virtual instruction with SP where we started. - * - * VM Spec 0.5 uses a trap to fetch HVM record now. - */ - -/* - * Save full register state, while setting up thread_info struct - * pointer derived from kernel stack pointer in THREADINFO_REG - * register, putting prior thread_info.regs pointer in a callee-save - * register (R24, which had better not ever be assigned to THREADINFO_REG), - * and updating thread_info.regs to point to current stack frame, - * so as to support nested events in kernel mode. - * - * As this is common code, we set the pt_regs system call number - * to -1 for all events. It will be replaced with the system call - * number in the case where we decode a system call (trap0(#1)). - */ - -#define save_pt_regs()\ - memd(R0 + #_PT_R3130) = R31:30; \ - { memw(R0 + #_PT_R2928) = R28; \ - R31 = memw(R0 + #_PT_ER_VMPSP); }\ - { memw(R0 + #(_PT_R2928 + 4)) = R31; \ - R31 = ugp; } \ - { memd(R0 + #_PT_R2726) = R27:26; \ - R30 = gp ; } \ - memd(R0 + #_PT_R2524) = R25:24; \ - memd(R0 + #_PT_R2322) = R23:22; \ - memd(R0 + #_PT_R2120) = R21:20; \ - memd(R0 + #_PT_R1918) = R19:18; \ - memd(R0 + #_PT_R1716) = R17:16; \ - memd(R0 + #_PT_R1514) = R15:14; \ - memd(R0 + #_PT_R1312) = R13:12; \ - { memd(R0 + #_PT_R1110) = R11:10; \ - R15 = lc0; } \ - { memd(R0 + #_PT_R0908) = R9:8; \ - R14 = sa0; } \ - { memd(R0 + #_PT_R0706) = R7:6; \ - R13 = lc1; } \ - { memd(R0 + #_PT_R0504) = R5:4; \ - R12 = sa1; } \ - { memd(R0 + #_PT_UGPGP) = R31:30; \ - R11 = m1; \ - R2.H = #HI(_THREAD_SIZE); } \ - { memd(R0 + #_PT_LC0SA0) = R15:14; \ - R10 = m0; \ - R2.L = #LO(_THREAD_SIZE); } \ - { memd(R0 + #_PT_LC1SA1) = R13:12; \ - R15 = p3:0; \ - R2 = neg(R2); } \ - { memd(R0 + #_PT_M1M0) = R11:10; \ - R14 = usr; \ - R2 = and(R0,R2); } \ - { memd(R0 + #_PT_PREDSUSR) = R15:14; \ - THREADINFO_REG = R2; } \ - { r24 = memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS); \ - memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS) = R0; \ - R2 = #-1; } \ - { memw(R0 + #_PT_SYSCALL_NR) = R2; \ - R30 = #0; } - -/* - * Restore registers and thread_info.regs state. THREADINFO_REG - * is assumed to still be sane, and R24 to have been correctly - * preserved. Don't restore R29 (SP) until later. - */ - -#define restore_pt_regs() \ - { memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS) = R24; \ - R15:14 = memd(R0 + #_PT_PREDSUSR); } \ - { R11:10 = memd(R0 + #_PT_M1M0); \ - p3:0 = R15; } \ - { R13:12 = memd(R0 + #_PT_LC1SA1); \ - usr = R14; } \ - { R15:14 = memd(R0 + #_PT_LC0SA0); \ - m1 = R11; } \ - { R3:2 = memd(R0 + #_PT_R0302); \ - m0 = R10; } \ - { R5:4 = memd(R0 + #_PT_R0504); \ - lc1 = R13; } \ - { R7:6 = memd(R0 + #_PT_R0706); \ - sa1 = R12; } \ - { R9:8 = memd(R0 + #_PT_R0908); \ - lc0 = R15; } \ - { R11:10 = memd(R0 + #_PT_R1110); \ - sa0 = R14; } \ - { R13:12 = memd(R0 + #_PT_R1312); \ - R15:14 = memd(R0 + #_PT_R1514); } \ - { R17:16 = memd(R0 + #_PT_R1716); \ - R19:18 = memd(R0 + #_PT_R1918); } \ - { R21:20 = memd(R0 + #_PT_R2120); \ - R23:22 = memd(R0 + #_PT_R2322); } \ - { R25:24 = memd(R0 + #_PT_R2524); \ - R27:26 = memd(R0 + #_PT_R2726); } \ - R31:30 = memd(R0 + #_PT_UGPGP); \ - { R28 = memw(R0 + #_PT_R2928); \ - ugp = R31; } \ - { R31:30 = memd(R0 + #_PT_R3130); \ - gp = R30; } - - /* - * Clears off enough space for the rest of pt_regs; evrec is a part - * of pt_regs in HVM mode. Save R0/R1, set handler's address in R1. - * R0 is the address of pt_regs and is the parameter to save_pt_regs. - */ - -/* - * Since the HVM isn't automagically pushing the EVREC onto the stack anymore, - * we'll subract the entire size out and then fill it in ourselves. - * Need to save off R0, R1, R2, R3 immediately. - */ - -#define vm_event_entry(CHandler) \ - { \ - R29 = add(R29, #-(_PT_REGS_SIZE)); \ - memd(R29 + #(_PT_R0100 + -_PT_REGS_SIZE)) = R1:0; \ - } \ - { \ - memd(R29 +#_PT_R0302) = R3:2; \ - } \ - trap1(#HVM_TRAP1_VMGETREGS); \ - { \ - memd(R29 + #_PT_ER_VMEL) = R1:0; \ - R0 = R29; \ - R1.L = #LO(CHandler); \ - } \ - { \ - memd(R29 + #_PT_ER_VMPSP) = R3:2; \ - R1.H = #HI(CHandler); \ - jump event_dispatch; \ - } - -.text - /* - * Do bulk save/restore in one place. - * Adds a jump to dispatch latency, but - * saves hundreds of bytes. - */ - -event_dispatch: - save_pt_regs() - callr r1 - - /* - * If we were in kernel mode, we don't need to check scheduler - * or signals if CONFIG_PREEMPT is not set. If set, then it has - * to jump to a need_resched kind of block. - * BTW, CONFIG_PREEMPT is not supported yet. - */ - -#ifdef CONFIG_PREEMPT - R0 = #VM_INT_DISABLE - trap1(#HVM_TRAP1_VMSETIE) -#endif - - /* "Nested control path" -- if the previous mode was kernel */ - R0 = memw(R29 + #_PT_ER_VMEST); - P0 = tstbit(R0, #HVM_VMEST_UM_SFT); - if !P0 jump restore_all; - /* - * Returning from system call, normally coming back from user mode - */ -return_from_syscall: - /* Disable interrupts while checking TIF */ - R0 = #VM_INT_DISABLE - trap1(#HVM_TRAP1_VMSETIE) - - /* - * Coming back from the C-world, our thread info pointer - * should be in the designated register (usually R19) - */ - R1.L = #LO(_TIF_ALLWORK_MASK) - { - R1.H = #HI(_TIF_ALLWORK_MASK); - R0 = memw(THREADINFO_REG + #_THREAD_INFO_FLAGS); - } - - /* - * Compare against the "return to userspace" _TIF_WORK_MASK - */ - R1 = and(R1,R0); - { P0 = cmp.eq(R1,#0); if (!P0.new) jump:t work_pending;} - jump restore_all; /* we're outta here! */ - -work_pending: - { - P0 = tstbit(R1, #TIF_NEED_RESCHED); - if (!P0.new) jump:nt work_notifysig; - } - call schedule - jump return_from_syscall; /* check for more work */ - -work_notifysig: - /* this is the part that's kind of fuzzy. */ - R1 = and(R0, #(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME)); - P0 = cmp.eq(R1, #0); - if P0 jump restore_all - R1 = R0; /* unsigned long thread_info_flags */ - R0 = R29; /* regs should still be at top of stack */ - call do_notify_resume - -restore_all: - /* Disable interrupts, if they weren't already, before reg restore. */ - R0 = #VM_INT_DISABLE - trap1(#HVM_TRAP1_VMSETIE) - - /* do the setregs here for VM 0.5 */ - /* R29 here should already be pointing at pt_regs */ - R1:0 = memd(R29 + #_PT_ER_VMEL); - R3:2 = memd(R29 + #_PT_ER_VMPSP); - trap1(#HVM_TRAP1_VMSETREGS); - - R0 = R29 - restore_pt_regs() - R1:0 = memd(R29 + #_PT_R0100); - R29 = add(R29, #_PT_REGS_SIZE); - trap1(#HVM_TRAP1_VMRTE) - /* Notreached */ - - .globl _K_enter_genex -_K_enter_genex: - vm_event_entry(do_genex) - - .globl _K_enter_interrupt -_K_enter_interrupt: - vm_event_entry(arch_do_IRQ) - - .globl _K_enter_trap0 -_K_enter_trap0: - vm_event_entry(do_trap0) - - .globl _K_enter_machcheck -_K_enter_machcheck: - vm_event_entry(do_machcheck) - - - .globl ret_from_fork -ret_from_fork: - call schedule_tail - jump return_from_syscall |