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aarch64: Revert the change of the __reserved member of mcontext_t

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The uc_mcontext.__reserved member of ucontext_t is a user visible API,
that should not be changed, because this is the only way to access cpu
states of various extensions of linux asm/sigcontext.h, it does not
violate namespace rules either, so revert this part of the commit

commit 4fa9b3bfe6759c82beb4b043a54a3598ca467289
Commit:     Joseph Myers <joseph@codesourcery.com>

    Fix mcontext_t sigcontext namespace (bug 21457).

(In principle the user can type cast &uc_mcontext to struct sigcontext*
to use the linux sigcontext fields, but that's not the existing practice
since mcontext_t used to be a typedef of struct sigcontext.)

	[BZ #22742]
	* sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h (__glibc_reserved1):
	Rename to __reserved and add comment.
	* sysdeps/unix/sysv/linux/aarch64/ucontext_i.sym (__glibc_reserved1):
	Rename to __reserved.
This commit is contained in:
Szabolcs Nagy 2018-01-22 11:13:31 +00:00
parent 394b5bac88
commit c739e191d0
3 changed files with 14 additions and 2 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2018-01-24 Szabolcs Nagy <szabolcs.nagy@arm.com>
[BZ #22742]
* sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h (__glibc_reserved1):
Rename to __reserved and add comment.
* sysdeps/unix/sysv/linux/aarch64/ucontext_i.sym (__glibc_reserved1):
Rename to __reserved.
2018-01-24 Joseph Myers <joseph@codesourcery.com>
* scripts/build-many-glibcs.py (Context.add_all_configs): Add

6
sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h
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@ -56,7 +56,11 @@ typedef struct
unsigned long long int __ctx(sp);
unsigned long long int __ctx(pc);
unsigned long long int __ctx(pstate);
unsigned char __glibc_reserved1[4096] __attribute__ ((__aligned__ (16)));
/* This field contains extension records for additional processor
state such as the FP/SIMD state. It has to match the definition
of the corresponding field in the sigcontext struct, see the
arch/arm64/include/uapi/asm/sigcontext.h linux header for details. */
unsigned char __reserved[4096] __attribute__ ((__aligned__ (16)));
} mcontext_t;
/* Userlevel context. */

2
sysdeps/unix/sysv/linux/aarch64/ucontext_i.sym
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@ -38,7 +38,7 @@ oX0 mcontext (regs)
oSP mcontext (sp)
oPC mcontext (pc)
oPSTATE mcontext (pstate)
oEXTENSION mcontext (__glibc_reserved1)
oEXTENSION mcontext (__reserved)
#define fpsimd_context(member) offsetof (struct fpsimd_context, member)