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x86/traps: Introduce fill_trap_info(), simplify DO_ERROR_INFO() 

Extract the fill-siginfo code from DO_ERROR_INFO() into the new helper,
fill_trap_info().

It can calculate si_code and si_addr looking at trapnr, so we can remove
these arguments from DO_ERROR_INFO() and simplify the source code. The
generated code is the same, __builtin_constant_p(trapnr) == T.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
Oleg Nesterov 2014-05-07 17:59:39 +02:00
parent dff0796e53
commit 958d3d7298
1 changed files with 38 additions and 15 deletions
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41
arch/x86/kernel/traps.c
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@ -136,6 +136,33 @@ do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str,
return -1;
}
static void fill_trap_info(struct pt_regs *regs, int signr, int trapnr,
siginfo_t *info)
{
unsigned long siaddr;
int sicode;
switch (trapnr) {
case X86_TRAP_DE:
sicode = FPE_INTDIV;
siaddr = regs->ip;
break;
case X86_TRAP_UD:
sicode = ILL_ILLOPN;
siaddr = regs->ip;
break;
case X86_TRAP_AC:
sicode = BUS_ADRALN;
siaddr = 0;
break;
}
info->si_signo = signr;
info->si_errno = 0;
info->si_code = sicode;
info->si_addr = (void __user *)siaddr;
}
static void __kprobes
do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
long error_code, siginfo_t *info)
@ -191,30 +218,26 @@ dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
do_error_trap(regs, error_code, str, trapnr, signr, NULL); \
}
#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
#define DO_ERROR_INFO(trapnr, signr, str, name) \
dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
{ \
siginfo_t info; \
\
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
info.si_addr = (void __user *)siaddr; \
\
fill_trap_info(regs, signr, trapnr, &info); \
do_error_trap(regs, error_code, str, trapnr, signr, &info); \
}
DO_ERROR_INFO(X86_TRAP_DE, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip )
DO_ERROR_INFO(X86_TRAP_DE, SIGFPE, "divide error", divide_error)
DO_ERROR (X86_TRAP_OF, SIGSEGV, "overflow", overflow)
DO_ERROR (X86_TRAP_BR, SIGSEGV, "bounds", bounds)
DO_ERROR_INFO(X86_TRAP_UD, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip )
DO_ERROR_INFO(X86_TRAP_UD, SIGILL, "invalid opcode", invalid_op)
DO_ERROR (X86_TRAP_OLD_MF, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
DO_ERROR (X86_TRAP_TS, SIGSEGV, "invalid TSS", invalid_TSS)
DO_ERROR (X86_TRAP_NP, SIGBUS, "segment not present", segment_not_present)
#ifdef CONFIG_X86_32
DO_ERROR (X86_TRAP_SS, SIGBUS, "stack segment", stack_segment)
#endif
DO_ERROR_INFO(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0 )
DO_ERROR_INFO(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check)
#ifdef CONFIG_X86_64
/* Runs on IST stack */