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arch/tile: avoid ISO namespace pollution with <asm/sigcontext.h>
<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
parent
c3b92c8787
commit
e0b1f39d55
2 changed files with 82 additions and 35 deletions
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@ -15,13 +15,78 @@
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/**
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* @file
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*
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* ABI-related register definitions helpful when writing assembly code.
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* ABI-related register definitions.
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*/
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#ifndef __ARCH_ABI_H__
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#define __ARCH_ABI_H__
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#include <arch/chip.h>
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#if !defined __need_int_reg_t && !defined __DOXYGEN__
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# define __ARCH_ABI_H__
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# include <arch/chip.h>
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#endif
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/* Provide the basic machine types. */
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#ifndef __INT_REG_BITS
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/** Number of bits in a register. */
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#if defined __tilegx__
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# define __INT_REG_BITS 64
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#elif defined __tilepro__
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# define __INT_REG_BITS 32
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#elif !defined __need_int_reg_t
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# include <arch/chip.h>
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# define __INT_REG_BITS CHIP_WORD_SIZE()
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#else
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# error Unrecognized architecture with __need_int_reg_t
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#endif
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#if __INT_REG_BITS == 64
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#ifndef __ASSEMBLER__
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/** Unsigned type that can hold a register. */
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typedef unsigned long long __uint_reg_t;
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/** Signed type that can hold a register. */
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typedef long long __int_reg_t;
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#endif
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/** String prefix to use for printf(). */
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#define __INT_REG_FMT "ll"
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#else
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#ifndef __ASSEMBLER__
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/** Unsigned type that can hold a register. */
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typedef unsigned long __uint_reg_t;
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/** Signed type that can hold a register. */
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typedef long __int_reg_t;
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#endif
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/** String prefix to use for printf(). */
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#define __INT_REG_FMT "l"
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#endif
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#endif /* __INT_REG_BITS */
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#ifndef __need_int_reg_t
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#ifndef __ASSEMBLER__
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/** Unsigned type that can hold a register. */
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typedef __uint_reg_t uint_reg_t;
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/** Signed type that can hold a register. */
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typedef __int_reg_t int_reg_t;
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#endif
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/** String prefix to use for printf(). */
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#define INT_REG_FMT __INT_REG_FMT
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/** Number of bits in a register. */
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#define INT_REG_BITS __INT_REG_BITS
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/* Registers 0 - 55 are "normal", but some perform special roles. */
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@ -59,7 +124,7 @@
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* The ABI requires callers to allocate a caller state save area of
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* this many bytes at the bottom of each stack frame.
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*/
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#define C_ABI_SAVE_AREA_SIZE (2 * (CHIP_WORD_SIZE() / 8))
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#define C_ABI_SAVE_AREA_SIZE (2 * (INT_REG_BITS / 8))
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/**
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* The operand to an 'info' opcode directing the backtracer to not
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@ -67,30 +132,10 @@
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*/
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#define INFO_OP_CANNOT_BACKTRACE 2
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#ifndef __ASSEMBLER__
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#if CHIP_WORD_SIZE() > 32
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/** Unsigned type that can hold a register. */
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typedef unsigned long long uint_reg_t;
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#endif /* !__need_int_reg_t */
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/** Signed type that can hold a register. */
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typedef long long int_reg_t;
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/** String prefix to use for printf(). */
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#define INT_REG_FMT "ll"
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#elif !defined(__LP64__) /* avoid confusion with LP64 cross-build tools */
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/** Unsigned type that can hold a register. */
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typedef unsigned long uint_reg_t;
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/** Signed type that can hold a register. */
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typedef long int_reg_t;
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/** String prefix to use for printf(). */
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#define INT_REG_FMT "l"
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#endif
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#endif /* __ASSEMBLER__ */
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/* Make sure we later can get all the definitions and declarations. */
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#undef __need_int_reg_t
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#endif /* !__ARCH_ABI_H__ */
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@ -15,6 +15,8 @@
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#ifndef _ASM_TILE_SIGCONTEXT_H
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#define _ASM_TILE_SIGCONTEXT_H
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/* Don't pollute the namespace since <signal.h> includes this file. */
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#define __need_int_reg_t
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#include <arch/abi.h>
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/*
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@ -22,14 +24,14 @@
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* but is simplified since we know the fault is from userspace.
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*/
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struct sigcontext {
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uint_reg_t gregs[53]; /* General-purpose registers. */
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uint_reg_t tp; /* Aliases gregs[TREG_TP]. */
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uint_reg_t sp; /* Aliases gregs[TREG_SP]. */
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uint_reg_t lr; /* Aliases gregs[TREG_LR]. */
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uint_reg_t pc; /* Program counter. */
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uint_reg_t ics; /* In Interrupt Critical Section? */
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uint_reg_t faultnum; /* Fault number. */
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uint_reg_t pad[5];
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__uint_reg_t gregs[53]; /* General-purpose registers. */
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__uint_reg_t tp; /* Aliases gregs[TREG_TP]. */
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__uint_reg_t sp; /* Aliases gregs[TREG_SP]. */
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__uint_reg_t lr; /* Aliases gregs[TREG_LR]. */
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__uint_reg_t pc; /* Program counter. */
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__uint_reg_t ics; /* In Interrupt Critical Section? */
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__uint_reg_t faultnum; /* Fault number. */
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__uint_reg_t pad[5];
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};
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#endif /* _ASM_TILE_SIGCONTEXT_H */
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