From 8cf14af0a740fb7e9f94a203b5a989beb875d58f Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 28 Sep 2005 20:21:11 -0700 Subject: [SPARC64]: Convert to use generic exception table support. The funny "range" exception table entries we had were only used by the compat layer socketcall assembly, and it wasn't even needed there. For free we now get proper exception table sorting and fast binary searching. Signed-off-by: David S. Miller --- arch/sparc64/mm/fault.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) (limited to 'arch/sparc64/mm/fault.c') diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c index db1e3310e907..59dc9a2ece5a 100644 --- a/arch/sparc64/mm/fault.c +++ b/arch/sparc64/mm/fault.c @@ -242,7 +242,6 @@ static unsigned int get_fault_insn(struct pt_regs *regs, unsigned int insn) static void do_kernel_fault(struct pt_regs *regs, int si_code, int fault_code, unsigned int insn, unsigned long address) { - unsigned long g2; unsigned char asi = ASI_P; if ((!insn) && (regs->tstate & TSTATE_PRIV)) @@ -273,11 +272,9 @@ static void do_kernel_fault(struct pt_regs *regs, int si_code, int fault_code, } } - g2 = regs->u_regs[UREG_G2]; - /* Is this in ex_table? */ if (regs->tstate & TSTATE_PRIV) { - unsigned long fixup; + const struct exception_table_entry *entry; if (asi == ASI_P && (insn & 0xc0800000) == 0xc0800000) { if (insn & 0x2000) @@ -288,10 +285,9 @@ static void do_kernel_fault(struct pt_regs *regs, int si_code, int fault_code, /* Look in asi.h: All _S asis have LS bit set */ if ((asi & 0x1) && - (fixup = search_extables_range(regs->tpc, &g2))) { - regs->tpc = fixup; + (entry = search_exception_tables(regs->tpc))) { + regs->tpc = entry->fixup; regs->tnpc = regs->tpc + 4; - regs->u_regs[UREG_G2] = g2; return; } } else { -- cgit v1.2.2 From efdc1e2083e04cc70721d55803889b346c1a3de2 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 28 Sep 2005 21:06:47 -0700 Subject: [SPARC64]: Simplify user fault fixup handling. Instead of doing byte-at-a-time user accesses to figure out where the fault occurred, read the saved fault_address from the current thread structure. For the sake of defensive programming, if the fault_address does not fall into the user buffer range, simply assume the whole area faulted. This will cause the fixup for copy_from_user() to clear the entire kernel side buffer. Signed-off-by: David S. Miller --- arch/sparc64/mm/fault.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) (limited to 'arch/sparc64/mm/fault.c') diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c index 59dc9a2ece5a..4a52e79d515f 100644 --- a/arch/sparc64/mm/fault.c +++ b/arch/sparc64/mm/fault.c @@ -457,7 +457,7 @@ good_area: } up_read(&mm->mmap_sem); - goto fault_done; + return; /* * Something tried to access memory that isn't in our memory map.. @@ -469,8 +469,7 @@ bad_area: handle_kernel_fault: do_kernel_fault(regs, si_code, fault_code, insn, address); - - goto fault_done; + return; /* * We ran out of memory, or some other thing happened to us that made @@ -501,9 +500,4 @@ do_sigbus: /* Kernel mode? Handle exceptions or die */ if (regs->tstate & TSTATE_PRIV) goto handle_kernel_fault; - -fault_done: - /* These values are no longer needed, clear them. */ - set_thread_fault_code(0); - current_thread_info()->fault_address = 0; } -- cgit v1.2.2 From 0836a0eb4073c3e0a09c5965833b9dec19f5abc7 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 28 Sep 2005 21:38:08 -0700 Subject: [SPARC64]: Move phys_base, kern_{base,size}, and sp_banks[] init to paging_init Also, move prom_probe_memory() into arch/sparc64/mm/init.c Signed-off-by: David S. Miller --- arch/sparc64/mm/fault.c | 47 ----------------------------------------------- 1 file changed, 47 deletions(-) (limited to 'arch/sparc64/mm/fault.c') diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c index 4a52e79d515f..80793d61f311 100644 --- a/arch/sparc64/mm/fault.c +++ b/arch/sparc64/mm/fault.c @@ -71,53 +71,6 @@ void set_brkpt(unsigned long addr, unsigned char mask, int flags, int mode) : "memory"); } -/* Nice, simple, prom library does all the sweating for us. ;) */ -unsigned long __init prom_probe_memory (void) -{ - register struct linux_mlist_p1275 *mlist; - register unsigned long bytes, base_paddr, tally; - register int i; - - i = 0; - mlist = *prom_meminfo()->p1275_available; - bytes = tally = mlist->num_bytes; - base_paddr = mlist->start_adr; - - sp_banks[0].base_addr = base_paddr; - sp_banks[0].num_bytes = bytes; - - while (mlist->theres_more != (void *) 0) { - i++; - mlist = mlist->theres_more; - bytes = mlist->num_bytes; - tally += bytes; - if (i >= SPARC_PHYS_BANKS-1) { - printk ("The machine has more banks than " - "this kernel can support\n" - "Increase the SPARC_PHYS_BANKS " - "setting (currently %d)\n", - SPARC_PHYS_BANKS); - i = SPARC_PHYS_BANKS-1; - break; - } - - sp_banks[i].base_addr = mlist->start_adr; - sp_banks[i].num_bytes = mlist->num_bytes; - } - - i++; - sp_banks[i].base_addr = 0xdeadbeefbeefdeadUL; - sp_banks[i].num_bytes = 0; - - /* Now mask all bank sizes on a page boundary, it is all we can - * use anyways. - */ - for (i = 0; sp_banks[i].num_bytes != 0; i++) - sp_banks[i].num_bytes &= PAGE_MASK; - - return tally; -} - static void __kprobes unhandled_fault(unsigned long address, struct task_struct *tsk, struct pt_regs *regs) -- cgit v1.2.2 From 10147570f9eaff3920f0c67bad7244c2eb958d4f Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 28 Sep 2005 21:46:43 -0700 Subject: [SPARC64]: Kill all external references to sp_banks[] Thus, we can mark sp_banks[] static in arch/sparc64/mm/init.c Signed-off-by: David S. Miller --- arch/sparc64/mm/fault.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/sparc64/mm/fault.c') diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c index 80793d61f311..31fbc67719a1 100644 --- a/arch/sparc64/mm/fault.c +++ b/arch/sparc64/mm/fault.c @@ -32,8 +32,6 @@ #define ELEMENTS(arr) (sizeof (arr)/sizeof (arr[0])) -extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS]; - /* * To debug kernel to catch accesses to certain virtual/physical addresses. * Mode = 0 selects physical watchpoints, mode = 1 selects virtual watchpoints. -- cgit v1.2.2