From: Florian Weimer Date: Thu, 9 Dec 2021 08:49:32 +0000 (+0100) Subject: nptl: Introduce THREAD_GETMEM_VOLATILE X-Git-Tag: glibc-2.35~280 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d1927d8dc5aad0f01c929123086be3a5b799d18;p=thirdparty%2Fglibc.git nptl: Introduce THREAD_GETMEM_VOLATILE This will be needed for rseq TCB access. Reviewed-by: Szabolcs Nagy --- diff --git a/sysdeps/i386/nptl/tcb-access.h b/sysdeps/i386/nptl/tcb-access.h index 6c6d561e394..5ddd83224bc 100644 --- a/sysdeps/i386/nptl/tcb-access.h +++ b/sysdeps/i386/nptl/tcb-access.h @@ -41,6 +41,8 @@ } \ __value; }) +/* THREAD_GETMEM already forces a read. */ +#define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ #define THREAD_GETMEM_NC(descr, member, idx) \ diff --git a/sysdeps/nptl/tcb-access.h b/sysdeps/nptl/tcb-access.h index b4137b8ab80..bbe20b7225b 100644 --- a/sysdeps/nptl/tcb-access.h +++ b/sysdeps/nptl/tcb-access.h @@ -22,6 +22,8 @@ #define THREAD_GETMEM(descr, member) \ descr->member +#define THREAD_GETMEM_VOLATILE(descr, member) \ + (*(volatile __typeof (descr->member) *)&descr->member) #define THREAD_GETMEM_NC(descr, member, idx) \ descr->member[idx] #define THREAD_SETMEM(descr, member, value) \ diff --git a/sysdeps/x86_64/nptl/tcb-access.h b/sysdeps/x86_64/nptl/tcb-access.h index 18848a729d1..e4d2d07a9b2 100644 --- a/sysdeps/x86_64/nptl/tcb-access.h +++ b/sysdeps/x86_64/nptl/tcb-access.h @@ -39,6 +39,8 @@ } \ __value; }) +/* THREAD_GETMEM already forces a read. */ +#define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ # define THREAD_GETMEM_NC(descr, member, idx) \