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65 lines
2.1 KiB
Plaintext
65 lines
2.1 KiB
Plaintext
commit ce25aa57a3cdd028be5868423e6e55506ccd1053
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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/i386.
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Derive the pointer to the DTV array from the gs_base register. As
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with FreeBSD/amd64, gs_base is currently only available via the native
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target.
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gdb/ChangeLog:
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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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diff --git gdb/i386-fbsd-tdep.c gdb/i386-fbsd-tdep.c
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index ac57e7383d..f274847174 100644
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--- gdb/i386-fbsd-tdep.c
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+++ gdb/i386-fbsd-tdep.c
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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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}
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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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+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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+
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+ if (tdep->fsbase_regnum == -1)
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+ error (_("Unable to fetch %%gsbase"));
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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, tdep->fsbase_regnum + 1);
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+
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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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+
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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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+
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static void
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i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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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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i386fbsd_core_read_description);
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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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+ i386fbsd_get_thread_local_address);
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}
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void
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