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64 lines
2.2 KiB
Plaintext
64 lines
2.2 KiB
Plaintext
commit f5424cfa7e9337a6cb02a1f83c9feea0995c5350
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Author: John Baldwin <jhb@FreeBSD.org>
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Date: Tue Mar 12 13:39:02 2019 -0700
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Support TLS variables on FreeBSD/amd64.
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Use the fs_base register to fetch the address of a thread's tcb and
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calculate the address of the DTV array. This value is then passed to
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fbsd_get_thread_local_address to compute the final variable address.
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Note that fs_base is currently only available via the native target as
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core dumps on FreeBSD do not store the value of fs_base.
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gdb/ChangeLog:
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* amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New.
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(amd64fbsd_init_abi): Install gdbarch
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"fetch_tls_load_module_address" and "get_thread_local_address"
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methods.
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diff --git gdb/amd64-fbsd-tdep.c gdb/amd64-fbsd-tdep.c
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index 403e65022d..7e2e9edf21 100644
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--- gdb/amd64-fbsd-tdep.c
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+++ gdb/amd64-fbsd-tdep.c
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@@ -204,6 +204,26 @@ amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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&amd64fbsd_xstateregset, "XSAVE extended state", cb_data);
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}
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+/* Implement the get_thread_local_address gdbarch method. */
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+
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+static CORE_ADDR
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+amd64fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
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+ CORE_ADDR lm_addr, CORE_ADDR offset)
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+{
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+ struct regcache *regcache;
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+
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+ regcache = get_thread_arch_regcache (ptid, gdbarch);
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+
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+ target_fetch_registers (regcache, AMD64_FSBASE_REGNUM);
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+
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+ ULONGEST fsbase;
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+ if (regcache->cooked_read (AMD64_FSBASE_REGNUM, &fsbase) != REG_VALID)
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+ error (_("Unable to fetch %%fsbase"));
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+
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+ CORE_ADDR dtv_addr = fsbase + gdbarch_ptr_bit (gdbarch) / 8;
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+ return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
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+}
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+
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static void
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amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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@@ -241,6 +261,11 @@ amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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/* FreeBSD uses SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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+
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+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
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+ svr4_fetch_objfile_link_map);
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+ set_gdbarch_get_thread_local_address (gdbarch,
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+ amd64fbsd_get_thread_local_address);
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}
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void
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