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WSL2-Linux-Kernel
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signal/openrisc: Use force_sig_fault where appropriate 

Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.

Simplify this process by using the helper force_sig_fault.  Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.

In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.

Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Stafford Horne <shorne@gmail.com>
Cc: openrisc@lists.librecores.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-04-15 20:14:10 -05:00
Родитель c046e2c693
Коммит 75bfb9a1c8
2 изменённых файлов: 9 добавлений и 43 удалений
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33
arch/openrisc/kernel/traps.c
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@ -250,28 +250,16 @@ void __init trap_init(void)
asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
{
siginfo_t info;
clear_siginfo(&info);
info.si_signo = SIGTRAP;
info.si_code = TRAP_TRACE;
info.si_addr = (void *)address;
force_sig_info(SIGTRAP, &info, current);
force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address, current);
regs->pc += 4;
}
asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
{
siginfo_t info;
if (user_mode(regs)) {
/* Send a SIGBUS */
clear_siginfo(&info);
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRALN;
info.si_addr = (void __user *)address;
force_sig_info(SIGBUS, &info, current);
force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address, current);
} else {
printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
show_registers(regs);
@ -282,16 +270,9 @@ asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
{
siginfo_t info;
if (user_mode(regs)) {
/* Send a SIGBUS */
clear_siginfo(&info);
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;
info.si_addr = (void *)address;
force_sig_info(SIGBUS, &info, current);
force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, current);
} else { /* Kernel mode */
printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
show_registers(regs);
@ -466,7 +447,6 @@ static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
asmlinkage void do_illegal_instruction(struct pt_regs *regs,
unsigned long address)
{
siginfo_t info;
unsigned int op;
unsigned int insn = *((unsigned int *)address);
@ -487,12 +467,7 @@ asmlinkage void do_illegal_instruction(struct pt_regs *regs,
if (user_mode(regs)) {
/* Send a SIGILL */
clear_siginfo(&info);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = (void *)address;
force_sig_info(SIGBUS, &info, current);
force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address, current);
} else { /* Kernel mode */
printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
address);

19
arch/openrisc/mm/fault.c
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@ -52,11 +52,10 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
struct task_struct *tsk;
struct mm_struct *mm;
struct vm_area_struct *vma;
siginfo_t info;
int si_code;
int fault;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
clear_siginfo(&info);
tsk = current;
/*
@ -98,7 +97,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
}
mm = tsk->mm;
info.si_code = SEGV_MAPERR;
si_code = SEGV_MAPERR;
/*
* If we're in an interrupt or have no user
@ -140,7 +139,7 @@ retry:
*/
good_area:
info.si_code = SEGV_ACCERR;
si_code = SEGV_ACCERR;
/* first do some preliminary protection checks */
@ -214,11 +213,7 @@ bad_area_nosemaphore:
/* User mode accesses just cause a SIGSEGV */
if (user_mode(regs)) {
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
info.si_addr = (void *)address;
force_sig_info(SIGSEGV, &info, tsk);
force_sig_fault(SIGSEGV, si_code, (void __user *)address, tsk);
return;
}
@ -283,11 +278,7 @@ do_sigbus:
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;
info.si_addr = (void *)address;
force_sig_info(SIGBUS, &info, tsk);
force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, tsk);
/* Kernel mode? Handle exceptions or die */
if (!user_mode(regs))