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ARC updates for 5.3-rc1 

- long due rewrite of do_page_fault
 
  - refactoring of entry/exit code to utilize the double load/store instructions
 
  - hsdk platform updates
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Merge tag 'arc-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC updates from Vineet Gupta:

 - long due rewrite of do_page_fault

 - refactoring of entry/exit code to utilize the double load/store
   instructions

 - hsdk platform updates

* tag 'arc-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: [plat-hsdk]: Enable AXI DW DMAC in defconfig
  ARC: [plat-hsdk]: enable DW SPI controller
  ARC: hide unused function unw_hdr_alloc
  ARC: [haps] Add Virtio support
  ARCv2: entry: simplify return to Delay Slot via interrupt
  ARC: entry: EV_Trap expects r10 (vs. r9) to have exception cause
  ARCv2: entry: rewrite to enable use of double load/stores LDD/STD
  ARCv2: entry: avoid a branch
  ARCv2: entry: push out the Z flag unclobber from common EXCEPTION_PROLOGUE
  ARCv2: entry: comments about hardware auto-save on taken interrupts
  ARC: mm: do_page_fault refactor #8: release mmap_sem sooner
  ARC: mm: do_page_fault refactor #7: fold the various error handling
  ARC: mm: do_page_fault refactor #6: error handlers to use same pattern
  ARC: mm: do_page_fault refactor #5: scoot no_context to end
  ARC: mm: do_page_fault refactor #4: consolidate retry related logic
  ARC: mm: do_page_fault refactor #3: tidyup vma access permission code
  ARC: mm: do_page_fault refactor #2: remove short lived variable
  ARC: mm: do_page_fault refactor #1: remove label @good_area
This commit is contained in:
Linus Torvalds 2019-07-16 15:07:51 -07:00
parent c309b6f242 24a20b0a44
commit 3eb514866f
14 changed files with 386 additions and 349 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
arch/arc/boot/dts/haps_hs.dts
View File

@ -62,5 +62,35 @@
#interrupt-cells = <1>; #interrupt-cells = <1>;
interrupts = <20>; interrupts = <20>;
}; };
virtio0: virtio@f0100000 {
compatible = "virtio,mmio";
reg = <0xf0100000 0x2000>;
interrupts = <31>;
};
virtio1: virtio@f0102000 {
compatible = "virtio,mmio";
reg = <0xf0102000 0x2000>;
interrupts = <32>;
};
virtio2: virtio@f0104000 {
compatible = "virtio,mmio";
reg = <0xf0104000 0x2000>;
interrupts = <33>;
};
virtio3: virtio@f0106000 {
compatible = "virtio,mmio";
reg = <0xf0106000 0x2000>;
interrupts = <34>;
};
virtio4: virtio@f0108000 {
compatible = "virtio,mmio";
reg = <0xf0108000 0x2000>;
interrupts = <35>;
};
}; };
}; };

14
arch/arc/boot/dts/hsdk.dts
View File

@ -8,6 +8,7 @@
*/ */
/dts-v1/; /dts-v1/;
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/reset/snps,hsdk-reset.h> #include <dt-bindings/reset/snps,hsdk-reset.h>
/ { / {
@ -252,6 +253,19 @@
dma-coherent; dma-coherent;
}; };
spi0: spi@20000 {
compatible = "snps,dw-apb-ssi";
reg = <0x20000 0x100>;
#address-cells = <1>;
#size-cells = <0>;
interrupts = <16>;
num-cs = <2>;
reg-io-width = <4>;
clocks = <&input_clk>;
cs-gpios = <&creg_gpio 0 GPIO_ACTIVE_LOW>,
<&creg_gpio 1 GPIO_ACTIVE_LOW>;
};
creg_gpio: gpio@14b0 { creg_gpio: gpio@14b0 {
compatible = "snps,creg-gpio-hsdk"; compatible = "snps,creg-gpio-hsdk";
reg = <0x14b0 0x4>; reg = <0x14b0 0x4>;

5
arch/arc/configs/haps_hs_defconfig
View File

@ -35,10 +35,12 @@ CONFIG_INET=y
# CONFIG_IPV6 is not set # CONFIG_IPV6 is not set
# CONFIG_WIRELESS is not set # CONFIG_WIRELESS is not set
CONFIG_DEVTMPFS=y CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
# CONFIG_STANDALONE is not set # CONFIG_STANDALONE is not set
# CONFIG_PREVENT_FIRMWARE_BUILD is not set # CONFIG_PREVENT_FIRMWARE_BUILD is not set
# CONFIG_BLK_DEV is not set CONFIG_VIRTIO_BLK=y
CONFIG_NETDEVICES=y CONFIG_NETDEVICES=y
CONFIG_VIRTIO_NET=y
# CONFIG_NET_VENDOR_ARC is not set # CONFIG_NET_VENDOR_ARC is not set
# CONFIG_NET_VENDOR_BROADCOM is not set # CONFIG_NET_VENDOR_BROADCOM is not set
# CONFIG_NET_VENDOR_INTEL is not set # CONFIG_NET_VENDOR_INTEL is not set
@ -68,6 +70,7 @@ CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_LOGO=y CONFIG_LOGO=y
# CONFIG_HID is not set # CONFIG_HID is not set
# CONFIG_USB_SUPPORT is not set # CONFIG_USB_SUPPORT is not set
CONFIG_VIRTIO_MMIO=y
# CONFIG_IOMMU_SUPPORT is not set # CONFIG_IOMMU_SUPPORT is not set
CONFIG_EXT2_FS=y CONFIG_EXT2_FS=y
CONFIG_EXT2_FS_XATTR=y CONFIG_EXT2_FS_XATTR=y

5
arch/arc/configs/hsdk_defconfig
View File

@ -46,6 +46,9 @@ CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_DW=y CONFIG_SERIAL_8250_DW=y
CONFIG_SERIAL_OF_PLATFORM=y CONFIG_SERIAL_OF_PLATFORM=y
# CONFIG_HW_RANDOM is not set # CONFIG_HW_RANDOM is not set
CONFIG_SPI=y
CONFIG_SPI_DESIGNWARE=y
CONFIG_SPI_DW_MMIO=y
CONFIG_GPIOLIB=y CONFIG_GPIOLIB=y
CONFIG_GPIO_SYSFS=y CONFIG_GPIO_SYSFS=y
CONFIG_GPIO_DWAPB=y CONFIG_GPIO_DWAPB=y
@ -66,6 +69,8 @@ CONFIG_MMC=y
CONFIG_MMC_SDHCI=y CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_PLTFM=y CONFIG_MMC_SDHCI_PLTFM=y
CONFIG_MMC_DW=y CONFIG_MMC_DW=y
CONFIG_DMADEVICES=y
CONFIG_DW_AXI_DMAC=y
CONFIG_EXT3_FS=y CONFIG_EXT3_FS=y
CONFIG_VFAT_FS=y CONFIG_VFAT_FS=y
CONFIG_TMPFS=y CONFIG_TMPFS=y

373
arch/arc/include/asm/entry-arcv2.h
View File

@ -7,232 +7,251 @@
#include <asm/irqflags-arcv2.h> #include <asm/irqflags-arcv2.h>
#include <asm/thread_info.h> /* For THREAD_SIZE */ #include <asm/thread_info.h> /* For THREAD_SIZE */
/*------------------------------------------------------------------------*/ /*
.macro INTERRUPT_PROLOGUE called_from * Interrupt/Exception stack layout (pt_regs) for ARCv2
* (End of struct aligned to end of page [unless nested])
*
* INTERRUPT EXCEPTION
*
* manual --------------------- manual
* | orig_r0 |
* | event/ECR |
* | bta |
* | user_r25 |
* | gp |
* | fp |
* | sp |
* | r12 |
* | r30 |
* | r58 |
* | r59 |
* hw autosave ---------------------
* optional | r0 |
* | r1 |
* ~ ~
* | r9 |
* | r10 |
* | r11 |
* | blink |
* | lpe |
* | lps |
* | lpc |
* | ei base |
* | ldi base |
* | jli base |
* ---------------------
* hw autosave | pc / eret |
* mandatory | stat32 / erstatus |
* ---------------------
*/
; Before jumping to Interrupt Vector, hardware micro-ops did following: /*------------------------------------------------------------------------*/
.macro INTERRUPT_PROLOGUE
; (A) Before jumping to Interrupt Vector, hardware micro-ops did following:
; 1. SP auto-switched to kernel mode stack ; 1. SP auto-switched to kernel mode stack
; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1, K:0) ; 2. STATUS32.Z flag set if in U mode at time of interrupt (U:1,K:0)
; 3. Auto saved: r0-r11, blink, LPE,LPS,LPC, JLI,LDI,EI, PC, STAT32 ; 3. Auto save: (mandatory) Push PC and STAT32 on stack
; hardware does even if CONFIG_ARC_IRQ_NO_AUTOSAVE
; 4. Auto save: (optional) r0-r11, blink, LPE,LPS,LPC, JLI,LDI,EI
; ;
; Now manually save: r12, sp, fp, gp, r25 ; (B) Manually saved some regs: r12,r25,r30, sp,fp,gp, ACCL pair
#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE #ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE
.ifnc \called_from, exception ; carve pt_regs on stack (case #3), PC/STAT32 already on stack
st.as r9, [sp, -10] ; save r9 in it's final stack slot sub sp, sp, SZ_PT_REGS - 8
sub sp, sp, 12 ; skip JLI, LDI, EI
PUSH lp_count __SAVE_REGFILE_HARD
PUSHAX lp_start #else
PUSHAX lp_end ; carve pt_regs on stack (case #4), which grew partially already
PUSH blink sub sp, sp, PT_r0
PUSH r11
PUSH r10
sub sp, sp, 4 ; skip r9
PUSH r8
PUSH r7
PUSH r6
PUSH r5
PUSH r4
PUSH r3
PUSH r2
PUSH r1
PUSH r0
.endif
#endif #endif
#ifdef CONFIG_ARC_HAS_ACCL_REGS __SAVE_REGFILE_SOFT
PUSH r59 .endm
PUSH r58
#endif
PUSH r30 /*------------------------------------------------------------------------*/
PUSH r12 .macro EXCEPTION_PROLOGUE
; (A) Before jumping to Exception Vector, hardware micro-ops did following:
; 1. SP auto-switched to kernel mode stack
; 2. STATUS32.Z flag set if in U mode at time of exception (U:1,K:0)
;
; (B) Manually save the complete reg file below
sub sp, sp, SZ_PT_REGS ; carve pt_regs
; _HARD saves r10 clobbered by _SOFT as scratch hence comes first
__SAVE_REGFILE_HARD
__SAVE_REGFILE_SOFT
st r0, [sp] ; orig_r0
lr r10, [eret]
lr r11, [erstatus]
ST2 r10, r11, PT_ret
lr r10, [ecr]
lr r11, [erbta]
ST2 r10, r11, PT_event
; OUTPUT: r10 has ECR expected by EV_Trap
.endm
/*------------------------------------------------------------------------
* This macro saves the registers manually which would normally be autosaved
* by hardware on taken interrupts. It is used by
* - exception handlers (which don't have autosave)
* - interrupt autosave disabled due to CONFIG_ARC_IRQ_NO_AUTOSAVE
*/
.macro __SAVE_REGFILE_HARD
ST2 r0, r1, PT_r0
ST2 r2, r3, PT_r2
ST2 r4, r5, PT_r4
ST2 r6, r7, PT_r6
ST2 r8, r9, PT_r8
ST2 r10, r11, PT_r10
st blink, [sp, PT_blink]
lr r10, [lp_end]
lr r11, [lp_start]
ST2 r10, r11, PT_lpe
st lp_count, [sp, PT_lpc]
; skip JLI, LDI, EI for now
.endm
/*------------------------------------------------------------------------
* This macros saves a bunch of other registers which can't be autosaved for
* various reasons:
* - r12: the last caller saved scratch reg since hardware saves in pairs so r0-r11
* - r30: free reg, used by gcc as scratch
* - ACCL/ACCH pair when they exist
*/
.macro __SAVE_REGFILE_SOFT
ST2 gp, fp, PT_r26 ; gp (r26), fp (r27)
st r12, [sp, PT_sp + 4]
st r30, [sp, PT_sp + 8]
; Saving pt_regs->sp correctly requires some extra work due to the way ; Saving pt_regs->sp correctly requires some extra work due to the way
; Auto stack switch works ; Auto stack switch works
; - U mode: retrieve it from AUX_USER_SP ; - U mode: retrieve it from AUX_USER_SP
; - K mode: add the offset from current SP where H/w starts auto push ; - K mode: add the offset from current SP where H/w starts auto push
; ;
; Utilize the fact that Z bit is set if Intr taken in U mode ; 1. Utilize the fact that Z bit is set if Intr taken in U mode
mov.nz r9, sp ; 2. Upon entry SP is always saved (for any inspection, unwinding etc),
add.nz r9, r9, SZ_PT_REGS - PT_sp - 4 ; but on return, restored only if U mode
bnz 1f
lr r9, [AUX_USER_SP] lr r10, [AUX_USER_SP] ; U mode SP
1:
PUSH r9 ; SP
PUSH fp ; ISA requires ADD.nz to have same dest and src reg operands
PUSH gp mov.nz r10, sp
add.nz r10, r10, SZ_PT_REGS ; K mode SP
st r10, [sp, PT_sp] ; SP (pt_regs->sp)
#ifdef CONFIG_ARC_CURR_IN_REG #ifdef CONFIG_ARC_CURR_IN_REG
PUSH r25 ; user_r25 st r25, [sp, PT_user_r25]
GET_CURR_TASK_ON_CPU r25 GET_CURR_TASK_ON_CPU r25
#else
sub sp, sp, 4
#endif #endif
.ifnc \called_from, exception
sub sp, sp, 12 ; BTA/ECR/orig_r0 placeholder per pt_regs
.endif
.endm
/*------------------------------------------------------------------------*/
.macro INTERRUPT_EPILOGUE called_from
.ifnc \called_from, exception
add sp, sp, 12 ; skip BTA/ECR/orig_r0 placeholderss
.endif
#ifdef CONFIG_ARC_CURR_IN_REG
POP r25
#else
add sp, sp, 4
#endif
POP gp
POP fp
; Don't touch AUX_USER_SP if returning to K mode (Z bit set)
; (Z bit set on K mode is inverse of INTERRUPT_PROLOGUE)
add.z sp, sp, 4
bz 1f
POPAX AUX_USER_SP
1:
POP r12
POP r30
#ifdef CONFIG_ARC_HAS_ACCL_REGS #ifdef CONFIG_ARC_HAS_ACCL_REGS
POP r58 ST2 r58, r59, PT_sp + 12
POP r59
#endif
#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE
.ifnc \called_from, exception
POP r0
POP r1
POP r2
POP r3
POP r4
POP r5
POP r6
POP r7
POP r8
POP r9
POP r10
POP r11
POP blink
POPAX lp_end
POPAX lp_start
POP r9
mov lp_count, r9
add sp, sp, 12 ; skip JLI, LDI, EI
ld.as r9, [sp, -10] ; reload r9 which got clobbered
.endif
#endif #endif
.endm .endm
/*------------------------------------------------------------------------*/ /*------------------------------------------------------------------------*/
.macro EXCEPTION_PROLOGUE .macro __RESTORE_REGFILE_SOFT
; Before jumping to Exception Vector, hardware micro-ops did following: LD2 gp, fp, PT_r26 ; gp (r26), fp (r27)
; 1. SP auto-switched to kernel mode stack
; 2. STATUS32.Z flag set to U mode at time of interrupt (U:1,K:0)
;
; Now manually save the complete reg file
PUSH r9 ; freeup a register: slot of erstatus ld r12, [sp, PT_sp + 4]
ld r30, [sp, PT_sp + 8]
PUSHAX eret ; Restore SP (into AUX_USER_SP) only if returning to U mode
sub sp, sp, 12 ; skip JLI, LDI, EI ; - for K mode, it will be implicitly restored as stack is unwound
PUSH lp_count ; - Z flag set on K is inverse of what hardware does on interrupt entry
PUSHAX lp_start ; but that doesn't really matter
PUSHAX lp_end bz 1f
PUSH blink
PUSH r11 ld r10, [sp, PT_sp] ; SP (pt_regs->sp)
PUSH r10 sr r10, [AUX_USER_SP]
1:
ld.as r9, [sp, 10] ; load stashed r9 (status32 stack slot) #ifdef CONFIG_ARC_CURR_IN_REG
lr r10, [erstatus] ld r25, [sp, PT_user_r25]
st.as r10, [sp, 10] ; save status32 at it's right stack slot #endif
PUSH r9 #ifdef CONFIG_ARC_HAS_ACCL_REGS
PUSH r8 LD2 r58, r59, PT_sp + 12
PUSH r7 #endif
PUSH r6 .endm
PUSH r5
PUSH r4
PUSH r3
PUSH r2
PUSH r1
PUSH r0
; -- for interrupts, regs above are auto-saved by h/w in that order -- /*------------------------------------------------------------------------*/
; Now do what ISR prologue does (manually save r12, sp, fp, gp, r25) .macro __RESTORE_REGFILE_HARD
;
; Set Z flag if this was from U mode (expected by INTERRUPT_PROLOGUE)
; Although H/w exception micro-ops do set Z flag for U mode (just like
; for interrupts), it could get clobbered in case we soft land here from
; a TLB Miss exception handler (tlbex.S)
and r10, r10, STATUS_U_MASK ld blink, [sp, PT_blink]
xor.f 0, r10, STATUS_U_MASK
INTERRUPT_PROLOGUE exception LD2 r10, r11, PT_lpe
sr r10, [lp_end]
sr r11, [lp_start]
PUSHAX erbta ld r10, [sp, PT_lpc] ; lp_count can't be target of LD
PUSHAX ecr ; r9 contains ECR, expected by EV_Trap mov lp_count, r10
LD2 r0, r1, PT_r0
LD2 r2, r3, PT_r2
LD2 r4, r5, PT_r4
LD2 r6, r7, PT_r6
LD2 r8, r9, PT_r8
LD2 r10, r11, PT_r10
.endm
/*------------------------------------------------------------------------*/
.macro INTERRUPT_EPILOGUE
; INPUT: r0 has STAT32 of calling context
; INPUT: Z flag set if returning to K mode
; _SOFT clobbers r10 restored by _HARD hence the order
__RESTORE_REGFILE_SOFT
#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE
__RESTORE_REGFILE_HARD
add sp, sp, SZ_PT_REGS - 8
#else
add sp, sp, PT_r0
#endif
PUSH r0 ; orig_r0
.endm .endm
/*------------------------------------------------------------------------*/ /*------------------------------------------------------------------------*/
.macro EXCEPTION_EPILOGUE .macro EXCEPTION_EPILOGUE
; Assumes r0 has PT_status32 ; INPUT: r0 has STAT32 of calling context
btst r0, STATUS_U_BIT ; Z flag set if K, used in INTERRUPT_EPILOGUE
add sp, sp, 8 ; orig_r0/ECR don't need restoring btst r0, STATUS_U_BIT ; Z flag set if K, used in restoring SP
POPAX erbta
INTERRUPT_EPILOGUE exception ld r10, [sp, PT_event + 4]
sr r10, [erbta]
POP r0 LD2 r10, r11, PT_ret
POP r1 sr r10, [eret]
POP r2 sr r11, [erstatus]
POP r3
POP r4
POP r5
POP r6
POP r7
POP r8
POP r9
POP r10
POP r11
POP blink __RESTORE_REGFILE_SOFT
POPAX lp_end __RESTORE_REGFILE_HARD
POPAX lp_start
POP r9 add sp, sp, SZ_PT_REGS
mov lp_count, r9
add sp, sp, 12 ; skip JLI, LDI, EI
POPAX eret
POPAX erstatus
ld.as r9, [sp, -12] ; reload r9 which got clobbered
.endm .endm
.macro FAKE_RET_FROM_EXCPN .macro FAKE_RET_FROM_EXCPN

4
arch/arc/include/asm/entry-compact.h
View File

@ -195,8 +195,8 @@
PUSHAX CTOP_AUX_EFLAGS PUSHAX CTOP_AUX_EFLAGS
#endif #endif
lr r9, [ecr] lr r10, [ecr]
st r9, [sp, PT_event] /* EV_Trap expects r9 to have ECR */ st r10, [sp, PT_event] /* EV_Trap expects r10 to have ECR */
.endm .endm
/*-------------------------------------------------------------- /*--------------------------------------------------------------

18
arch/arc/include/asm/linkage.h
View File

@ -10,6 +10,24 @@
#ifdef __ASSEMBLY__ #ifdef __ASSEMBLY__
.macro ST2 e, o, off
#ifdef CONFIG_ARC_HAS_LL64
std \e, [sp, \off]
#else
st \e, [sp, \off]
st \o, [sp, \off+4]
#endif
.endm
.macro LD2 e, o, off
#ifdef CONFIG_ARC_HAS_LL64
ldd \e, [sp, \off]
#else
ld \e, [sp, \off]
ld \o, [sp, \off+4]
#endif
.endm
#define ASM_NL ` /* use '`' to mark new line in macro */ #define ASM_NL ` /* use '`' to mark new line in macro */
/* annotation for data we want in DCCM - if enabled in .config */ /* annotation for data we want in DCCM - if enabled in .config */

7
arch/arc/kernel/asm-offsets.c
View File

@ -55,7 +55,14 @@ int main(void)
DEFINE(PT_r5, offsetof(struct pt_regs, r5)); DEFINE(PT_r5, offsetof(struct pt_regs, r5));
DEFINE(PT_r6, offsetof(struct pt_regs, r6)); DEFINE(PT_r6, offsetof(struct pt_regs, r6));
DEFINE(PT_r7, offsetof(struct pt_regs, r7)); DEFINE(PT_r7, offsetof(struct pt_regs, r7));
DEFINE(PT_r8, offsetof(struct pt_regs, r8));
DEFINE(PT_r10, offsetof(struct pt_regs, r10));
DEFINE(PT_r26, offsetof(struct pt_regs, r26));
DEFINE(PT_ret, offsetof(struct pt_regs, ret)); DEFINE(PT_ret, offsetof(struct pt_regs, ret));
DEFINE(PT_blink, offsetof(struct pt_regs, blink));
DEFINE(PT_lpe, offsetof(struct pt_regs, lp_end));
DEFINE(PT_lpc, offsetof(struct pt_regs, lp_count));
DEFINE(PT_user_r25, offsetof(struct pt_regs, user_r25));
DEFINE(SZ_CALLEE_REGS, sizeof(struct callee_regs)); DEFINE(SZ_CALLEE_REGS, sizeof(struct callee_regs));
DEFINE(SZ_PT_REGS, sizeof(struct pt_regs)); DEFINE(SZ_PT_REGS, sizeof(struct pt_regs));

62
arch/arc/kernel/entry-arcv2.S
View File

@ -67,7 +67,7 @@ reserved:
ENTRY(handle_interrupt) ENTRY(handle_interrupt)
INTERRUPT_PROLOGUE irq INTERRUPT_PROLOGUE
# irq control APIs local_irq_save/restore/disable/enable fiddle with # irq control APIs local_irq_save/restore/disable/enable fiddle with
# global interrupt enable bits in STATUS32 (.IE for 1 prio, .E[] for 2 prio) # global interrupt enable bits in STATUS32 (.IE for 1 prio, .E[] for 2 prio)
@ -79,7 +79,7 @@ ENTRY(handle_interrupt)
# #
# Note this disable is only for consistent book-keeping as further interrupts # Note this disable is only for consistent book-keeping as further interrupts
# will be disabled anyways even w/o this. Hardware tracks active interrupts # will be disabled anyways even w/o this. Hardware tracks active interrupts
# seperately in AUX_IRQ_ACTIVE.active and will not take new interrupts # seperately in AUX_IRQ_ACT.active and will not take new interrupts
# unless this one returns (or higher prio becomes pending in 2-prio scheme) # unless this one returns (or higher prio becomes pending in 2-prio scheme)
IRQ_DISABLE IRQ_DISABLE
@ -200,17 +200,18 @@ restore_regs:
ld r0, [sp, PT_status32] ; U/K mode at time of entry ld r0, [sp, PT_status32] ; U/K mode at time of entry
lr r10, [AUX_IRQ_ACT] lr r10, [AUX_IRQ_ACT]
bmsk r11, r10, 15 ; AUX_IRQ_ACT.ACTIVE bmsk r11, r10, 15 ; extract AUX_IRQ_ACT.active
breq r11, 0, .Lexcept_ret ; No intr active, ret from Exception breq r11, 0, .Lexcept_ret ; No intr active, ret from Exception
;####### Return from Intr ####### ;####### Return from Intr #######
.Lisr_ret:
debug_marker_l1: debug_marker_l1:
; bbit1.nt r0, STATUS_DE_BIT, .Lintr_ret_to_delay_slot ; bbit1.nt r0, STATUS_DE_BIT, .Lintr_ret_to_delay_slot
btst r0, STATUS_DE_BIT ; Z flag set if bit clear btst r0, STATUS_DE_BIT ; Z flag set if bit clear
bnz .Lintr_ret_to_delay_slot ; branch if STATUS_DE_BIT set bnz .Lintr_ret_to_delay_slot ; branch if STATUS_DE_BIT set
.Lisr_ret_fast_path:
; Handle special case #1: (Entry via Exception, Return via IRQ) ; Handle special case #1: (Entry via Exception, Return via IRQ)
; ;
; Exception in U mode, preempted in kernel, Intr taken (K mode), orig ; Exception in U mode, preempted in kernel, Intr taken (K mode), orig
@ -223,7 +224,7 @@ debug_marker_l1:
bset.nz r11, r11, AUX_IRQ_ACT_BIT_U ; NZ means U bset.nz r11, r11, AUX_IRQ_ACT_BIT_U ; NZ means U
sr r11, [AUX_IRQ_ACT] sr r11, [AUX_IRQ_ACT]
INTERRUPT_EPILOGUE irq INTERRUPT_EPILOGUE
rtie rtie
;####### Return from Exception / pure kernel mode ####### ;####### Return from Exception / pure kernel mode #######
@ -244,8 +245,8 @@ debug_marker_syscall:
; ;
; IRQ RTIE won't reliably restore DE bit and/or BTA, needs workaround ; IRQ RTIE won't reliably restore DE bit and/or BTA, needs workaround
; ;
; Solution is return from Intr w/o any delay slot quirks into a kernel trampoline ; Solution is to drop out of interrupt context into pure kernel mode
; and from pure kernel mode return to delay slot which handles DS bit/BTA correctly ; and return from pure kernel mode which does right things for delay slot
.Lintr_ret_to_delay_slot: .Lintr_ret_to_delay_slot:
debug_marker_ds: debug_marker_ds:
@ -254,48 +255,9 @@ debug_marker_ds:
add r2, r2, 1 add r2, r2, 1
st r2, [@intr_to_DE_cnt] st r2, [@intr_to_DE_cnt]
ld r2, [sp, PT_ret] ; drop out of interrupt context (clear AUX_IRQ_ACT.active)
ld r3, [sp, PT_status32] bmskn r11, r10, 15
sr r11, [AUX_IRQ_ACT]
; STAT32 for Int return created from scratch b .Lexcept_ret
; (No delay dlot, disable Further intr in trampoline)
bic r0, r3, STATUS_U_MASK|STATUS_DE_MASK|STATUS_IE_MASK|STATUS_L_MASK
st r0, [sp, PT_status32]
mov r1, .Lintr_ret_to_delay_slot_2
st r1, [sp, PT_ret]
; Orig exception PC/STAT32 safekept @orig_r0 and @event stack slots
st r2, [sp, 0]
st r3, [sp, 4]
b .Lisr_ret_fast_path
.Lintr_ret_to_delay_slot_2:
; Trampoline to restore orig exception PC/STAT32/BTA/AUX_USER_SP
sub sp, sp, SZ_PT_REGS
st r9, [sp, -4]
ld r9, [sp, 0]
sr r9, [eret]
ld r9, [sp, 4]
sr r9, [erstatus]
; restore AUX_USER_SP if returning to U mode
bbit0 r9, STATUS_U_BIT, 1f
ld r9, [sp, PT_sp]
sr r9, [AUX_USER_SP]
1:
ld r9, [sp, 8]
sr r9, [erbta]
ld r9, [sp, -4]
add sp, sp, SZ_PT_REGS
; return from pure kernel mode to delay slot
rtie
END(ret_from_exception) END(ret_from_exception)

2
arch/arc/kernel/entry-compact.S
View File

@ -256,7 +256,7 @@ ENTRY(EV_TLBProtV)
EXCEPTION_PROLOGUE EXCEPTION_PROLOGUE
mov r2, r9 ; ECR set into r9 already mov r2, r10 ; ECR set into r10 already
lr r0, [efa] ; Faulting Data address (not part of pt_regs saved above) lr r0, [efa] ; Faulting Data address (not part of pt_regs saved above)
; Exception auto-disables further Intr/exceptions. ; Exception auto-disables further Intr/exceptions.

4
arch/arc/kernel/entry.S
View File

@ -232,8 +232,8 @@ ENTRY(EV_Trap)
EXCEPTION_PROLOGUE EXCEPTION_PROLOGUE
;============ TRAP 1 :breakpoints ;============ TRAP 1 :breakpoints
; Check ECR for trap with arg (PROLOGUE ensures r9 has ECR) ; Check ECR for trap with arg (PROLOGUE ensures r10 has ECR)
bmsk.f 0, r9, 7 bmsk.f 0, r10, 7
bnz trap_with_param bnz trap_with_param
;============ TRAP (no param): syscall top level ;============ TRAP (no param): syscall top level

9
arch/arc/kernel/unwind.c
View File

@ -181,11 +181,6 @@ static void *__init unw_hdr_alloc_early(unsigned long sz)
return memblock_alloc_from(sz, sizeof(unsigned int), MAX_DMA_ADDRESS); return memblock_alloc_from(sz, sizeof(unsigned int), MAX_DMA_ADDRESS);
} }
static void *unw_hdr_alloc(unsigned long sz)
{
return kmalloc(sz, GFP_KERNEL);
}
static void init_unwind_table(struct unwind_table *table, const char *name, static void init_unwind_table(struct unwind_table *table, const char *name,
const void *core_start, unsigned long core_size, const void *core_start, unsigned long core_size,
const void *init_start, unsigned long init_size, const void *init_start, unsigned long init_size,
@ -366,6 +361,10 @@ ret_err:
} }
#ifdef CONFIG_MODULES #ifdef CONFIG_MODULES
static void *unw_hdr_alloc(unsigned long sz)
{
return kmalloc(sz, GFP_KERNEL);
}
static struct unwind_table *last_table; static struct unwind_table *last_table;

183
arch/arc/mm/fault.c
View File

@ -63,24 +63,19 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
struct vm_area_struct *vma = NULL; struct vm_area_struct *vma = NULL;
struct task_struct *tsk = current; struct task_struct *tsk = current;
struct mm_struct *mm = tsk->mm; struct mm_struct *mm = tsk->mm;
int si_code = SEGV_MAPERR; int sig, si_code = SEGV_MAPERR;
int ret; unsigned int write = 0, exec = 0, mask;
vm_fault_t fault; vm_fault_t fault = VM_FAULT_SIGSEGV; /* handle_mm_fault() output */
int write = regs->ecr_cause & ECR_C_PROTV_STORE; /* ST/EX */ unsigned int flags; /* handle_mm_fault() input */
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
/* /*
* We fault-in kernel-space virtual memory on-demand. The
* 'reference' page table is init_mm.pgd.
*
* NOTE! We MUST NOT take any locks for this case. We may * NOTE! We MUST NOT take any locks for this case. We may
* be in an interrupt or a critical region, and should * be in an interrupt or a critical region, and should
* only copy the information from the master page table, * only copy the information from the master page table,
* nothing more. * nothing more.
*/ */
if (address >= VMALLOC_START && !user_mode(regs)) { if (address >= VMALLOC_START && !user_mode(regs)) {
ret = handle_kernel_vaddr_fault(address); if (unlikely(handle_kernel_vaddr_fault(address)))
if (unlikely(ret))
goto no_context; goto no_context;
else else
return; return;
@ -93,67 +88,80 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
if (faulthandler_disabled() || !mm) if (faulthandler_disabled() || !mm)
goto no_context; goto no_context;
if (regs->ecr_cause & ECR_C_PROTV_STORE) /* ST/EX */
write = 1;
else if ((regs->ecr_vec == ECR_V_PROTV) &&
(regs->ecr_cause == ECR_C_PROTV_INST_FETCH))
exec = 1;
flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
if (user_mode(regs)) if (user_mode(regs))
flags |= FAULT_FLAG_USER; flags |= FAULT_FLAG_USER;
if (write)
flags |= FAULT_FLAG_WRITE;
retry: retry:
down_read(&mm->mmap_sem); down_read(&mm->mmap_sem);
vma = find_vma(mm, address); vma = find_vma(mm, address);
if (!vma) if (!vma)
goto bad_area; goto bad_area;
if (vma->vm_start <= address) if (unlikely(address < vma->vm_start)) {
goto good_area; if (!(vma->vm_flags & VM_GROWSDOWN) || expand_stack(vma, address))
if (!(vma->vm_flags & VM_GROWSDOWN))
goto bad_area;
if (expand_stack(vma, address))
goto bad_area;
/*
* Ok, we have a good vm_area for this memory access, so
* we can handle it..
*/
good_area:
si_code = SEGV_ACCERR;
/* Handle protection violation, execute on heap or stack */
if ((regs->ecr_vec == ECR_V_PROTV) &&
(regs->ecr_cause == ECR_C_PROTV_INST_FETCH))
goto bad_area;
if (write) {
if (!(vma->vm_flags & VM_WRITE))
goto bad_area;
flags |= FAULT_FLAG_WRITE;
} else {
if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
goto bad_area; goto bad_area;
} }
/* /*
* If for any reason at all we couldn't handle the fault, * vm_area is good, now check permissions for this memory access
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/ */
mask = VM_READ;
if (write)
mask = VM_WRITE;
if (exec)
mask = VM_EXEC;
if (!(vma->vm_flags & mask)) {
si_code = SEGV_ACCERR;
goto bad_area;
}
fault = handle_mm_fault(vma, address, flags); fault = handle_mm_fault(vma, address, flags);
if (fatal_signal_pending(current)) { /*
* Fault retry nuances
*/
if (unlikely(fault & VM_FAULT_RETRY)) {
/* /*
* if fault retry, mmap_sem already relinquished by core mm * If fault needs to be retried, handle any pending signals
* so OK to return to user mode (with signal handled first) * first (by returning to user mode).
* mmap_sem already relinquished by core mm for RETRY case
*/ */
if (fault & VM_FAULT_RETRY) { if (fatal_signal_pending(current)) {
if (!user_mode(regs)) if (!user_mode(regs))
goto no_context; goto no_context;
return; return;
} }
/*
* retry state machine
*/
if (flags & FAULT_FLAG_ALLOW_RETRY) {
flags &= ~FAULT_FLAG_ALLOW_RETRY;
flags |= FAULT_FLAG_TRIED;
goto retry;
}
} }
bad_area:
up_read(&mm->mmap_sem);
/*
* Major/minor page fault accounting
* (in case of retry we only land here once)
*/
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
if (likely(!(fault & VM_FAULT_ERROR))) { if (likely(!(fault & VM_FAULT_ERROR))) {
if (flags & FAULT_FLAG_ALLOW_RETRY) {
/* To avoid updating stats twice for retry case */
if (fault & VM_FAULT_MAJOR) { if (fault & VM_FAULT_MAJOR) {
tsk->maj_flt++; tsk->maj_flt++;
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
@ -164,72 +172,33 @@ good_area:
regs, address); regs, address);
} }
if (fault & VM_FAULT_RETRY) { /* Normal return path: fault Handled Gracefully */
flags &= ~FAULT_FLAG_ALLOW_RETRY;
flags |= FAULT_FLAG_TRIED;
goto retry;
}
}
/* Fault Handled Gracefully */
up_read(&mm->mmap_sem);
return; return;
} }
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGSEGV)
goto bad_area;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
/* no man's land */
BUG();
/*
* Something tried to access memory that isn't in our memory map..
* Fix it, but check if it's kernel or user first..
*/
bad_area:
up_read(&mm->mmap_sem);
/* User mode accesses just cause a SIGSEGV */
if (user_mode(regs)) {
tsk->thread.fault_address = address;
force_sig_fault(SIGSEGV, si_code, (void __user *)address);
return;
}
no_context:
/* Are we prepared to handle this kernel fault?
*
* (The kernel has valid exception-points in the source
* when it accesses user-memory. When it fails in one
* of those points, we find it in a table and do a jump
* to some fixup code that loads an appropriate error
* code)
*/
if (fixup_exception(regs))
return;
die("Oops", regs, address);
out_of_memory:
up_read(&mm->mmap_sem);
if (user_mode(regs)) {
pagefault_out_of_memory();
return;
}
goto no_context;
do_sigbus:
up_read(&mm->mmap_sem);
if (!user_mode(regs)) if (!user_mode(regs))
goto no_context; goto no_context;
tsk->thread.fault_address = address; if (fault & VM_FAULT_OOM) {
force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address); pagefault_out_of_memory();
return;
}
if (fault & VM_FAULT_SIGBUS) {
sig = SIGBUS;
si_code = BUS_ADRERR;
}
else {
sig = SIGSEGV;
}
tsk->thread.fault_address = address;
force_sig_fault(sig, si_code, (void __user *)address);
return;
no_context:
if (fixup_exception(regs))
return;
die("Oops", regs, address);
} }

11
arch/arc/mm/tlbex.S
View File

@ -393,6 +393,17 @@ EV_TLBMissD_fast_ret: ; additional label for VDK OS-kit instrumentation
;-------- Common routine to call Linux Page Fault Handler ----------- ;-------- Common routine to call Linux Page Fault Handler -----------
do_slow_path_pf: do_slow_path_pf:
#ifdef CONFIG_ISA_ARCV2
; Set Z flag if exception in U mode. Hardware micro-ops do this on any
; taken interrupt/exception, and thus is already the case at the entry
; above, but ensuing code would have already clobbered.
; EXCEPTION_PROLOGUE called in slow path, relies on correct Z flag set
lr r2, [erstatus]
and r2, r2, STATUS_U_MASK
bxor.f 0, r2, STATUS_U_BIT
#endif
; Restore the 4-scratch regs saved by fast path miss handler ; Restore the 4-scratch regs saved by fast path miss handler
TLBMISS_RESTORE_REGS TLBMISS_RESTORE_REGS