From 4064f77d2f550762cbf220fec7c26a8ce4219ea4 Mon Sep 17 00:00:00 2001
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From: Alexander Egorenkov <egorenar@linux.ibm.com>
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Date: Sun, 8 Aug 2021 11:19:52 +0200
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Subject: [PATCH] src/rtld/dl-tls.c: Fix TLS offsets computation for s390 arch
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rtld_determine_tlsoffsets() didn't handle s390 arch properly by falling
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back to the default case. If TLS_TCB_AT_TP is 1, then set offset to -1.
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From glibc's sysdeps/s390/nptl/tls.h:
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-------------------------------------
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/* The TCB can have any size and the memory following the address the
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thread pointer points to is unspecified. Allocate the TCB there. */
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define TLS_TCB_AT_TP 1
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define TLS_DTV_AT_TP 0
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This lead to the following error:
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---------------------------------
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prelink-rtld: error while loading shared libraries: /lib64/libc.so.6: cannot handle TLS data
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Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
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---
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src/rtld/dl-tls.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/src/rtld/dl-tls.c b/src/rtld/dl-tls.c
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index 280cee45f950..29422dcfd25e 100644
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--- a/src/rtld/dl-tls.c
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+++ b/src/rtld/dl-tls.c
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@@ -143,6 +143,11 @@ rtld_determine_tlsoffsets (int e_machine, struct r_scope_elem *search_list)
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tls_tcb_size = 0;
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break;
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+ case EM_S390:
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+ tls_tcb_at_tp = 1;
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+ tls_tcb_size = -1;
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+ break;
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+
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default:
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/* Hope there's no TLS! */
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for (i = 0; i < search_list->r_nlist; i++)
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--
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2.31.1
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