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sigcontext/mcontext cleanup for arch-specific bits

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with these changes, the members/types of mcontext_t and related stuff
should closely match the glibc definitions. unlike glibc, however, the
definitions here avoid using typedefs as much as possible and work
directly with the underlying types, to minimize namespace pollution
from signal.h in the default (_BSD_SOURCE) profile.

this is a first step in improving compatibility with applications
which poke at context/register information -- mainly debuggers, trace
utilities, etc. additional definitions in ucontext.h and other headers
may be needed later.

if feature test macros are used to request a conforming namespace,
mcontext_t is replaced with an opaque structure of the equivalent size
and alignment; conforming programs cannot examine its contents anyway.
This commit is contained in:
Rich Felker 2012-11-23 14:35:25 -05:00
commit c72fc23843
5 changed files with 94 additions and 81 deletions
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30
arch/microblaze/bits/signal.h
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@ -1,9 +1,24 @@
#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
typedef struct sigcontext
{
struct {
unsigned long r0, r1, r2, r3, r4, r5, r6, r7;
unsigned long r8, r9, r10, r11, r12, r13, r14, r15;
unsigned long r16, r17, r18, r19, r20, r21, r22, r23;
unsigned long r24, r25, r26, r27, r28, r29, r30, r31;
unsigned long pc, msr, ear, esr, fsr;
int pt_mode;
} regs;
unsigned long oldmask;
} mcontext_t;
#else
typedef struct {
unsigned long __regs[39];
} mcontext_t;
#endif
typedef struct __ucontext {
unsigned long uc_flags;
@ -22,21 +37,6 @@ typedef struct __ucontext {
#define SA_RESETHAND 0x80000000
#define SA_RESTORER 0x04000000
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
struct sigcontext
{
struct {
unsigned long r0, r1, r2, r3, r4, r5, r6, r7;
unsigned long r8, r9, r10, r11, r12, r13, r14, r15;
unsigned long r16, r17, r18, r19, r20, r21, r22, r23;
unsigned long r24, r25, r26, r27, r28, r29, r30, r31;
unsigned long pc, msr, ear, esr, fsr;
int pt_mode;
} regs;
unsigned long oldmask;
};
#endif
#endif
#define SIGHUP 1