i386: prepare to convert exceptions to interrupts

There is some macro magic in traps_32.c to construct standard
exception dispatch functions. This patch renames the DO_ERROR-
like macros to DO_TRAP, and introduces new DO_ERROR ones that
conditionally reenable interrupts explicitly, like x86_64.

No code changes.

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 65 insertions, 11 deletions

diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index 203b863ac2a8..fe6dd972068d 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -528,6 +528,56 @@ vm86_trap:
         return;
 }
 
+#define DO_TRAP(trapnr, signr, str, name)                               \
+void do_##name(struct pt_regs *regs, long error_code)                   \
+{                                                                       \
+        trace_hardirqs_fixup();                                         \
+        if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
+                                                        == NOTIFY_STOP) \
+                return;                                                 \
+        do_trap(trapnr, signr, str, 0, regs, error_code, NULL);         \
+}
+
+#define DO_TRAP_INFO(trapnr, signr, str, name, sicode, siaddr, irq)     \
+void do_##name(struct pt_regs *regs, long error_code)                   \
+{                                                                       \
+        siginfo_t info;                                                 \
+        if (irq)                                                        \
+                local_irq_enable();                                     \
+        info.si_signo = signr;                                          \
+        info.si_errno = 0;                                              \
+        info.si_code = sicode;                                          \
+        info.si_addr = (void __user *)siaddr;                           \
+        if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
+                                                        == NOTIFY_STOP) \
+                return;                                                 \
+        do_trap(trapnr, signr, str, 0, regs, error_code, &info);        \
+}
+
+#define DO_VM86_TRAP(trapnr, signr, str, name)                          \
+void do_##name(struct pt_regs *regs, long error_code)                   \
+{                                                                       \
+        if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
+                                                        == NOTIFY_STOP) \
+                return;                                                 \
+        do_trap(trapnr, signr, str, 1, regs, error_code, NULL);         \
+}
+
+#define DO_VM86_TRAP_INFO(trapnr, signr, str, name, sicode, siaddr)     \
+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;                           \
+        trace_hardirqs_fixup();                                         \
+        if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
+                                                        == NOTIFY_STOP) \
+                return;                                                 \
+        do_trap(trapnr, signr, str, 1, regs, error_code, &info);        \
+}
+
 #define DO_ERROR(trapnr, signr, str, name)                              \
 void do_##name(struct pt_regs *regs, long error_code)                   \
 {                                                                       \
@@ -535,6 +585,7 @@ void do_##name(struct pt_regs *regs, long error_code)			\
         if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
                                                         == NOTIFY_STOP) \
                 return;                                                 \
+        conditional_sti(regs);                                          \
         do_trap(trapnr, signr, str, 0, regs, error_code, NULL);         \
 }
 
@@ -551,6 +602,7 @@ void do_##name(struct pt_regs *regs, long error_code)			\
         if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
                                                         == NOTIFY_STOP) \
                 return;                                                 \
+        conditional_sti(regs);                                          \
         do_trap(trapnr, signr, str, 0, regs, error_code, &info);        \
 }
 
@@ -560,6 +612,7 @@ void do_##name(struct pt_regs *regs, long error_code)			\
         if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
                                                         == NOTIFY_STOP) \
                 return;                                                 \
+        conditional_sti(regs);                                          \
         do_trap(trapnr, signr, str, 1, regs, error_code, NULL);         \
 }
 
@@ -575,22 +628,23 @@ void do_##name(struct pt_regs *regs, long error_code)			\
         if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)  \
                                                         == NOTIFY_STOP) \
                 return;                                                 \
+        conditional_sti(regs);                                          \
         do_trap(trapnr, signr, str, 1, regs, error_code, &info);        \
 }
 
-DO_VM86_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
+DO_VM86_TRAP_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
 #ifndef CONFIG_KPROBES
-DO_VM86_ERROR(3, SIGTRAP, "int3", int3)
+DO_VM86_TRAP(3, SIGTRAP, "int3", int3)
 #endif
-DO_VM86_ERROR(4, SIGSEGV, "overflow", overflow)
-DO_VM86_ERROR(5, SIGSEGV, "bounds", bounds)
-DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0)
-DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
-DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
-DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
-DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
-DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0)
-DO_ERROR_INFO(32, SIGILL, "iret exception", iret_error, ILL_BADSTK, 0, 1)
+DO_VM86_TRAP(4, SIGSEGV, "overflow", overflow)
+DO_VM86_TRAP(5, SIGSEGV, "bounds", bounds)
+DO_TRAP_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0)
+DO_TRAP(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
+DO_TRAP(10, SIGSEGV, "invalid TSS", invalid_TSS)
+DO_TRAP(11, SIGBUS, "segment not present", segment_not_present)
+DO_TRAP(12, SIGBUS, "stack segment", stack_segment)
+DO_TRAP_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0)
+DO_TRAP_INFO(32, SIGILL, "iret exception", iret_error, ILL_BADSTK, 0, 1)
 
 void __kprobes
 do_general_protection(struct pt_regs *regs, long error_code)