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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ia64/mm/extable.c | |
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/ia64/mm/extable.c')
-rw-r--r-- | arch/ia64/mm/extable.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/arch/ia64/mm/extable.c b/arch/ia64/mm/extable.c new file mode 100644 index 000000000000..6d259e34f359 --- /dev/null +++ b/arch/ia64/mm/extable.c @@ -0,0 +1,90 @@ +/* + * Kernel exception handling table support. Derived from arch/alpha/mm/extable.c. + * + * Copyright (C) 1998, 1999, 2001-2002, 2004 Hewlett-Packard Co + * David Mosberger-Tang <davidm@hpl.hp.com> + */ + +#include <linux/config.h> +#include <linux/sort.h> + +#include <asm/uaccess.h> +#include <asm/module.h> + +static int cmp_ex(const void *a, const void *b) +{ + const struct exception_table_entry *l = a, *r = b; + u64 lip = (u64) &l->addr + l->addr; + u64 rip = (u64) &r->addr + r->addr; + + /* avoid overflow */ + if (lip > rip) + return 1; + if (lip < rip) + return -1; + return 0; +} + +static void swap_ex(void *a, void *b, int size) +{ + struct exception_table_entry *l = a, *r = b, tmp; + u64 delta = (u64) r - (u64) l; + + tmp = *l; + l->addr = r->addr + delta; + l->cont = r->cont + delta; + r->addr = tmp.addr - delta; + r->cont = tmp.cont - delta; +} + +/* + * Sort the exception table. It's usually already sorted, but there + * may be unordered entries due to multiple text sections (such as the + * .init text section). Note that the exception-table-entries contain + * location-relative addresses, which requires a bit of care during + * sorting to avoid overflows in the offset members (e.g., it would + * not be safe to make a temporary copy of an exception-table entry on + * the stack, because the stack may be more than 2GB away from the + * exception-table). + */ +void sort_extable (struct exception_table_entry *start, + struct exception_table_entry *finish) +{ + sort(start, finish - start, sizeof(struct exception_table_entry), + cmp_ex, swap_ex); +} + +const struct exception_table_entry * +search_extable (const struct exception_table_entry *first, + const struct exception_table_entry *last, + unsigned long ip) +{ + const struct exception_table_entry *mid; + unsigned long mid_ip; + long diff; + + while (first <= last) { + mid = &first[(last - first)/2]; + mid_ip = (u64) &mid->addr + mid->addr; + diff = mid_ip - ip; + if (diff == 0) + return mid; + else if (diff < 0) + first = mid + 1; + else + last = mid - 1; + } + return NULL; +} + +void +ia64_handle_exception (struct pt_regs *regs, const struct exception_table_entry *e) +{ + long fix = (u64) &e->cont + e->cont; + + regs->r8 = -EFAULT; + if (fix & 4) + regs->r9 = 0; + regs->cr_iip = fix & ~0xf; + ia64_psr(regs)->ri = fix & 0x3; /* set continuation slot number */ +} |