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sh: Initial ELF FDPIC support.

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This adds initial support for ELF FDPIC on MMU-less SH, as per version
0.2 of the ABI definition at:

	http://www.codesourcery.com/public/docs/sh-fdpic/sh-fdpic-abi.txt

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2008-05-19 13:40:12 +09:00
parent 9b14ec35f0
commit 3bc24a1a54
6 changed files with 108 additions and 4 deletions
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25
arch/sh/kernel/signal_32.c
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@@ -33,6 +33,11 @@
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
struct fdpic_func_descriptor {
unsigned long text;
unsigned long GOT;
};
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
@@ -378,7 +383,15 @@ static int setup_frame(int sig, struct k_sigaction *ka,
regs->regs[4] = signal; /* Arg for signal handler */
regs->regs[5] = 0;
regs->regs[6] = (unsigned long) &frame->sc;
regs->pc = (unsigned long) ka->sa.sa_handler;
if (current->personality & FDPIC_FUNCPTRS) {
struct fdpic_func_descriptor __user *funcptr =
(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
__get_user(regs->pc, &funcptr->text);
__get_user(regs->regs[12], &funcptr->GOT);
} else
regs->pc = (unsigned long)ka->sa.sa_handler;
set_fs(USER_DS);
@@ -458,7 +471,15 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->regs[4] = signal; /* Arg for signal handler */
regs->regs[5] = (unsigned long) &frame->info;
regs->regs[6] = (unsigned long) &frame->uc;
regs->pc = (unsigned long) ka->sa.sa_handler;
if (current->personality & FDPIC_FUNCPTRS) {
struct fdpic_func_descriptor __user *funcptr =
(struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
__get_user(regs->pc, &funcptr->text);
__get_user(regs->regs[12], &funcptr->GOT);
} else
regs->pc = (unsigned long)ka->sa.sa_handler;
set_fs(USER_DS);