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commit 8d1927d8dc5aad0f01c929123086be3a5b799d18
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Dec 9 09:49:32 2021 +0100
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nptl: Introduce THREAD_GETMEM_VOLATILE
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This will be needed for rseq TCB access.
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Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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diff --git a/sysdeps/i386/nptl/tcb-access.h b/sysdeps/i386/nptl/tcb-access.h
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index 6c6d561e394817c7..5ddd83224bc8eb77 100644
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--- a/sysdeps/i386/nptl/tcb-access.h
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+++ b/sysdeps/i386/nptl/tcb-access.h
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@@ -41,6 +41,8 @@
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} \
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__value; })
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+/* THREAD_GETMEM already forces a read. */
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+#define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member)
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/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
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#define THREAD_GETMEM_NC(descr, member, idx) \
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diff --git a/sysdeps/nptl/tcb-access.h b/sysdeps/nptl/tcb-access.h
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index b4137b8ab8067915..bbe20b7225b060fd 100644
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--- a/sysdeps/nptl/tcb-access.h
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+++ b/sysdeps/nptl/tcb-access.h
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@@ -22,6 +22,8 @@
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#define THREAD_GETMEM(descr, member) \
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descr->member
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+#define THREAD_GETMEM_VOLATILE(descr, member) \
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+ (*(volatile __typeof (descr->member) *)&descr->member)
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#define THREAD_GETMEM_NC(descr, member, idx) \
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descr->member[idx]
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#define THREAD_SETMEM(descr, member, value) \
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diff --git a/sysdeps/x86_64/nptl/tcb-access.h b/sysdeps/x86_64/nptl/tcb-access.h
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index 18848a729d16a4f5..e4d2d07a9b218025 100644
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--- a/sysdeps/x86_64/nptl/tcb-access.h
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+++ b/sysdeps/x86_64/nptl/tcb-access.h
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@@ -39,6 +39,8 @@
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} \
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__value; })
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+/* THREAD_GETMEM already forces a read. */
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+#define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member)
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/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
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# define THREAD_GETMEM_NC(descr, member, idx) \
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