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commit f1ff8597ef9c37ff1a853411b9e3be1696c36d92
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Author: Philippe Waroquiers <philippe.waroquiers@skynet.be>
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Date: Tue Sep 19 23:17:48 2017 +0200
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Implement static TLS code for more platforms
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gdbserver_tests/hgtls is failing on a number of platforms
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as it looks like static tls handling is now needed.
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So, omplement static tls for a few more platforms.
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The formulas that are platform dependent are somewhat wild guesses
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obtained with trial and errors.
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Note that arm/arm64/ppc32 are not (yet) done
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diff --git a/coregrind/m_gdbserver/target.c b/coregrind/m_gdbserver/target.c
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index 10e52fc..1f03c12 100644
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--- a/coregrind/m_gdbserver/target.c
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+++ b/coregrind/m_gdbserver/target.c
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@@ -712,6 +712,7 @@ Bool valgrind_get_tls_addr (ThreadState *tst,
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// Check we can read the modid
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CHECK_DEREF(lm+lm_modid_offset, sizeof(unsigned long int), "link_map modid");
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modid = *(unsigned long int *)(lm+lm_modid_offset);
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+ dlog (2, "tid %u modid %lu\n", tst->tid, modid);
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// Check we can access the dtv entry for modid
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CHECK_DEREF(dtv + 2 * modid, sizeof(CORE_ADDR), "dtv[2*modid]");
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@@ -719,7 +720,6 @@ Bool valgrind_get_tls_addr (ThreadState *tst,
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// Compute the base address of the tls block.
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*tls_addr = *(dtv + 2 * modid);
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-#if defined(VGA_mips32) || defined(VGA_mips64)
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if (*tls_addr & 1) {
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/* This means that computed address is not valid, most probably
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because given module uses Static TLS.
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@@ -731,17 +731,24 @@ Bool valgrind_get_tls_addr (ThreadState *tst,
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CORE_ADDR tls_offset_addr;
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PtrdiffT tls_offset;
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- dlog(1, "computing tls_addr using static TLS\n");
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+ dlog(2, "tls_addr (%p & 1) => computing tls_addr using static TLS\n",
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+ (void*) *tls_addr);
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/* Assumes that tls_offset is placed right before tls_modid.
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To check the assumption, start a gdb on none/tests/tls and do:
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- p &((struct link_map*)0x0)->l_tls_modid
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- p &((struct link_map*)0x0)->l_tls_offset */
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+ p &((struct link_map*)0x0)->l_tls_modid
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+ p &((struct link_map*)0x0)->l_tls_offset
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+ Instead of assuming this, we could calculate this similarly to
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+ lm_modid_offset, by extending getplatformoffset to support querying
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+ more than one offset.
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+ */
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tls_offset_addr = lm + lm_modid_offset - sizeof(PtrdiffT);
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// Check we can read the tls_offset.
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CHECK_DEREF(tls_offset_addr, sizeof(PtrdiffT), "link_map tls_offset");
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tls_offset = *(PtrdiffT *)(tls_offset_addr);
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+ dlog(2, "tls_offset_addr %p tls_offset %ld\n",
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+ (void*)tls_offset_addr, (long)tls_offset);
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/* Following two values represent platform dependent constants
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NO_TLS_OFFSET and FORCED_DYNAMIC_TLS_OFFSET, respectively. */
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@@ -751,9 +758,18 @@ Bool valgrind_get_tls_addr (ThreadState *tst,
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}
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// This calculation is also platform dependent.
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+#if defined(VGA_mips32) || defined(VGA_mips64)
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*tls_addr = ((CORE_ADDR)dtv_loc + 2 * sizeof(CORE_ADDR) + tls_offset);
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- }
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+#elif defined(VGA_ppc64be) || defined(VGA_ppc64le)
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+ *tls_addr = ((CORE_ADDR)dtv_loc + sizeof(CORE_ADDR) + tls_offset);
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+#elif defined(VGA_x86) || defined(VGA_amd64) || defined(VGA_s390x)
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+ *tls_addr = (CORE_ADDR)dtv_loc - tls_offset - sizeof(CORE_ADDR);
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+#else
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+ // ppc32, arm, arm64
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+ dlog(0, "target.c is missing platform code for static TLS\n");
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+ return False;
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#endif
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+ }
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// Finally, add tls variable offset to tls block base address.
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*tls_addr += offset;
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