Support TLS variables on FreeBSD/i386.
Derive the pointer to the DTV array from the gs_base register. As with FreeBSD/amd64, gs_base is currently only available via the native target. gdb/ChangeLog: * i386-fbsd-tdep.c (i386fbsd_get_thread_local_address): New. (i386fbsd_init_abi): Install gdbarch "fetch_tls_load_module_address" and "get_thread_local_address" methods.
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@ -1,3 +1,10 @@
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2019-03-12 John Baldwin <jhb@FreeBSD.org>
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* i386-fbsd-tdep.c (i386fbsd_get_thread_local_address): New.
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(i386fbsd_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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2019-03-12 John Baldwin <jhb@FreeBSD.org>
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2019-03-12 John Baldwin <jhb@FreeBSD.org>
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* amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New.
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* amd64-fbsd-tdep.c (amd64fbsd_get_thread_local_address): New.
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@ -320,6 +320,30 @@ i386fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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"XSAVE extended state", cb_data);
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"XSAVE extended state", cb_data);
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}
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}
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/* Implement the get_thread_local_address gdbarch method. */
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static CORE_ADDR
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i386fbsd_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 gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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struct regcache *regcache;
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if (tdep->fsbase_regnum == -1)
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error (_("Unable to fetch %%gsbase"));
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regcache = get_thread_arch_regcache (ptid, gdbarch);
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target_fetch_registers (regcache, tdep->fsbase_regnum + 1);
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ULONGEST gsbase;
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if (regcache->cooked_read (tdep->fsbase_regnum + 1, &gsbase) != REG_VALID)
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error (_("Unable to fetch %%gsbase"));
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CORE_ADDR dtv_addr = gsbase + 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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static void
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static void
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i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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{
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@ -418,6 +442,11 @@ i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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set_gdbarch_core_read_description (gdbarch,
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set_gdbarch_core_read_description (gdbarch,
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i386fbsd_core_read_description);
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i386fbsd_core_read_description);
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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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i386fbsd_get_thread_local_address);
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}
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}
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void
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void
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