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arch/tile: avoid ISO namespace pollution with <asm/sigcontext.h>

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<asm/sigcontext.h> is used by glibc's <bits/sigcontext.h> from <signal.h>,
which means that it can't clutter the namespace with random symbols
or #defines.  However, we use <arch/abi.h> to get a suitable type to
hold a machine register.

This change makes <arch/abi.h> safe to use in this kind of context
if __need_int_reg_t is defined prior to including the file; in that
case, it only defines a few symbols that are safe in the ISO namespace
(prefixed with double underscores).  <asm/sigcontext.h> then uses
the __uint_reg_t type instead of the normal uint_reg_t.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2011-11-02 22:19:25 -04:00
parent c3b92c8787
commit e0b1f39d55
2 changed files with 82 additions and 35 deletions
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18
arch/tile/include/asm/sigcontext.h
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@ -15,6 +15,8 @@
#ifndef _ASM_TILE_SIGCONTEXT_H
#define _ASM_TILE_SIGCONTEXT_H
/* Don't pollute the namespace since <signal.h> includes this file. */
#define __need_int_reg_t
#include <arch/abi.h>
/*
@ -22,14 +24,14 @@
* but is simplified since we know the fault is from userspace.
*/
struct sigcontext {
uint_reg_t gregs[53]; /* General-purpose registers. */
uint_reg_t tp; /* Aliases gregs[TREG_TP]. */
uint_reg_t sp; /* Aliases gregs[TREG_SP]. */
uint_reg_t lr; /* Aliases gregs[TREG_LR]. */
uint_reg_t pc; /* Program counter. */
uint_reg_t ics; /* In Interrupt Critical Section? */
uint_reg_t faultnum; /* Fault number. */
uint_reg_t pad[5];
__uint_reg_t gregs[53]; /* General-purpose registers. */
__uint_reg_t tp; /* Aliases gregs[TREG_TP]. */
__uint_reg_t sp; /* Aliases gregs[TREG_SP]. */
__uint_reg_t lr; /* Aliases gregs[TREG_LR]. */
__uint_reg_t pc; /* Program counter. */
__uint_reg_t ics; /* In Interrupt Critical Section? */
__uint_reg_t faultnum; /* Fault number. */
__uint_reg_t pad[5];
};
#endif /* _ASM_TILE_SIGCONTEXT_H */