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authorJonas Bonn <jonas@southpole.se>2013-02-14 16:16:49 +0100
committerJonas Bonn <jonas@southpole.se>2013-02-14 16:39:26 +0100
commita81252d75e14cc2cf0ee45078ef143562a0bc279 (patch)
tree7b8bb82ebd471c129788dade8667f4e4fae285dc /arch/openrisc/kernel
parent7f81ea7e28c3e4e5b762111dc676b24152f85a3a (diff)
downloadlinux-a81252d75e14cc2cf0ee45078ef143562a0bc279.tar.gz
openrisc: fix up vmalloc page table loading
vmalloc'ed pages are faulted into a process' page tables on demand. In order to facilitate this, do_page_fault needs to know whether it was called via a page fault exception or a TLB-miss exception. This patch adds a wrapper around the _x_page_fault_handler entry points that the TLB-miss exceptions can call into in order to have the relevant parameter set to satisfy do_page_fault. This fixes a bug and is "good enough" for now. That said, this whole handling of vmalloc needs to be audited for correctness at some point. Signed-off-by: Jonas Bonn <jonas@southpole.se>
Diffstat (limited to 'arch/openrisc/kernel')
-rw-r--r--arch/openrisc/kernel/entry.S14
-rw-r--r--arch/openrisc/kernel/head.S6
2 files changed, 14 insertions, 6 deletions
diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S
index 5e5b30601bb..3de971224cf 100644
--- a/arch/openrisc/kernel/entry.S
+++ b/arch/openrisc/kernel/entry.S
@@ -201,12 +201,17 @@ EXCEPTION_ENTRY(_bus_fault_handler)
l.nop
/* ---[ 0x300: Data Page Fault exception ]------------------------------- */
+EXCEPTION_ENTRY(_dtlb_miss_page_fault_handler)
+ l.and r5,r5,r0
+ l.j 1f
+ l.nop
EXCEPTION_ENTRY(_data_page_fault_handler)
/* set up parameters for do_page_fault */
+ l.ori r5,r0,0x300 // exception vector
+1:
l.addi r3,r1,0 // pt_regs
/* r4 set be EXCEPTION_HANDLE */ // effective address of fault
- l.ori r5,r0,0x300 // exception vector
/*
* __PHX__: TODO
@@ -276,12 +281,17 @@ EXCEPTION_ENTRY(_data_page_fault_handler)
l.nop
/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */
+EXCEPTION_ENTRY(_itlb_miss_page_fault_handler)
+ l.and r5,r5,r0
+ l.j 1f
+ l.nop
EXCEPTION_ENTRY(_insn_page_fault_handler)
/* set up parameters for do_page_fault */
+ l.ori r5,r0,0x400 // exception vector
+1:
l.addi r3,r1,0 // pt_regs
/* r4 set be EXCEPTION_HANDLE */ // effective address of fault
- l.ori r5,r0,0x400 // exception vector
l.ori r6,r0,0x0 // !write access
/* call fault.c handler in or32/mm/fault.c */
diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S
index 46aa940ebd2..b357e7f79ac 100644
--- a/arch/openrisc/kernel/head.S
+++ b/arch/openrisc/kernel/head.S
@@ -1069,8 +1069,7 @@ d_pte_not_present:
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
- l.j _dispatch_do_dpage_fault
- l.nop
+ EXCEPTION_HANDLE(_dtlb_miss_page_fault_handler)
/* ==============================================[ ITLB miss handler ]=== */
ENTRY(itlb_miss_handler)
@@ -1192,8 +1191,7 @@ i_pte_not_present:
EXCEPTION_LOAD_GPR4
EXCEPTION_LOAD_GPR5
EXCEPTION_LOAD_GPR6
- l.j _dispatch_do_ipage_fault
- l.nop
+ EXCEPTION_HANDLE(_itlb_miss_page_fault_handler)
/* ==============================================[ boot tlb handlers ]=== */