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61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
commit b0f87ed032bb68a9965de81cbf9fd676a83b9174
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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/riscv.
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Derive the pointer to the DTV array from the tp register.
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gdb/ChangeLog:
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* riscv-fbsd-tdep.c (riscv_fbsd_get_thread_local_address): New.
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(riscv_fbsd_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/riscv-fbsd-tdep.c gdb/riscv-fbsd-tdep.c
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index 97ad28f59a..3125a2285e 100644
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--- gdb/riscv-fbsd-tdep.c
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+++ gdb/riscv-fbsd-tdep.c
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@@ -174,6 +174,28 @@ static const struct tramp_frame riscv_fbsd_sigframe =
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riscv_fbsd_sigframe_init
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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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+riscv_fbsd_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, RISCV_TP_REGNUM);
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+
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+ ULONGEST tp;
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+ if (regcache->cooked_read (RISCV_TP_REGNUM, &tp) != REG_VALID)
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+ error (_("Unable to fetch %%tp"));
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+
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+ /* %tp points to the end of the TCB which contains two pointers.
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+ The first pointer in the TCB points to the DTV array. */
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+ CORE_ADDR dtv_addr = tp - (gdbarch_ptr_bit (gdbarch) / 8) * 2;
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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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/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
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static void
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@@ -193,6 +215,11 @@ riscv_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, riscv_fbsd_iterate_over_regset_sections);
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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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+ riscv_fbsd_get_thread_local_address);
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}
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void
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