diff options
Diffstat (limited to 'packages/gdb/10.2/0005-arc-Add-support-for-signal-handlers.patch')
| -rw-r--r-- | packages/gdb/10.2/0005-arc-Add-support-for-signal-handlers.patch | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/packages/gdb/10.2/0005-arc-Add-support-for-signal-handlers.patch b/packages/gdb/10.2/0005-arc-Add-support-for-signal-handlers.patch new file mode 100644 index 00000000..c7f9545d --- /dev/null +++ b/packages/gdb/10.2/0005-arc-Add-support-for-signal-handlers.patch @@ -0,0 +1,226 @@ +From 977e6e7dc30737b2a8be382e604d2b998d446749 Mon Sep 17 00:00:00 2001 +From: Anton Kolesov <Anton.Kolesov@synopsys.com> +Date: Mon, 22 Aug 2016 19:39:46 +0300 +Subject: [PATCH 06/20] arc: Add support for signal handlers + +This patch adds the necessary infrastructure to handle signal frames for +ARC architecture. It is fairly similar to what any other architecture +would have. Linux specific parts will be in a separate patch. + +v2 [1]: +- Make the logic of "arc_sigtramp_frame_sniffer ()" simpler. + +[1] Tom's remark for the first version +https://sourceware.org/pipermail/gdb-patches/2020-November/173221.html + +gdb/ChangeLog: + + * arc-tdep.c (arc_make_sigtramp_frame_cache): New function. + (arc_sigtramp_frame_this_id): Likewise. + (arc_sigtramp_frame_prev_register): Likewise. + (arc_sigtramp_frame_sniffer): Likewise. + (arc_siftramp_frame_unwind): New global variable. + (arc_gdbarch_init): Use sigtramp capabilities. + (arc_dump_tdep): Print sigtramp fields. + * arc-tdep.h (gdbarch_tdep): Add sigtramp fields. + +Will be a part of GDB 11: +https://sourceware.org/git?p=binutils-gdb.git;a=commit;h=b4e3cd0440109d0a5552d3313ccbd35c8103335b +--- + gdb/ChangeLog | 11 +++++ + gdb/arc-tdep.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + gdb/arc-tdep.h | 13 ++++++ + 3 files changed, 147 insertions(+) + +--- a/gdb/ChangeLog ++++ b/gdb/ChangeLog +@@ -1,3 +1,14 @@ ++2020-12-22 Anton Kolesov <anton.kolesov@synopsys.com> ++ ++ * arc-tdep.c (arc_make_sigtramp_frame_cache): New function. ++ (arc_sigtramp_frame_this_id): Likewise. ++ (arc_sigtramp_frame_prev_register): Likewise. ++ (arc_sigtramp_frame_sniffer): Likewise. ++ (arc_siftramp_frame_unwind): New global variable. ++ (arc_gdbarch_init): Use sigtramp capabilities. ++ (arc_dump_tdep): Print sigtramp fields. ++ * arc-tdep.h (gdbarch_tdep): Add sigtramp fields. ++ + 2021-04-25 Joel Brobecker <brobecker@adacore.com> + + * version.in: Set GDB version number to 10.2. +--- a/gdb/arc-tdep.c ++++ b/gdb/arc-tdep.c +@@ -1843,6 +1843,104 @@ + reg->how = DWARF2_FRAME_REG_CFA; + } + ++/* Signal trampoline frame unwinder. Allows frame unwinding to happen ++ from within signal handlers. */ ++ ++static struct arc_frame_cache * ++arc_make_sigtramp_frame_cache (struct frame_info *this_frame) ++{ ++ if (arc_debug) ++ debug_printf ("arc: sigtramp_frame_cache\n"); ++ ++ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (this_frame)); ++ ++ /* Allocate new frame cache instance and space for saved register info. */ ++ struct arc_frame_cache *cache = FRAME_OBSTACK_ZALLOC (struct arc_frame_cache); ++ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); ++ ++ /* Get the stack pointer and use it as the frame base. */ ++ cache->prev_sp = arc_frame_base_address (this_frame, NULL); ++ ++ /* If the ARC-private target-dependent info doesn't have a table of ++ offsets of saved register contents within an OS signal context ++ structure, then there is nothing to analyze. */ ++ if (tdep->sc_reg_offset == NULL) ++ return cache; ++ ++ /* Find the address of the sigcontext structure. */ ++ CORE_ADDR addr = tdep->sigcontext_addr (this_frame); ++ ++ /* For each register, if its contents have been saved within the ++ sigcontext structure, determine the address of those contents. */ ++ gdb_assert (tdep->sc_num_regs <= (ARC_LAST_REGNUM + 1)); ++ for (int i = 0; i < tdep->sc_num_regs; i++) ++ { ++ if (tdep->sc_reg_offset[i] != ARC_OFFSET_NO_REGISTER) ++ cache->saved_regs[i].addr = addr + tdep->sc_reg_offset[i]; ++ } ++ ++ return cache; ++} ++ ++/* Implement the "this_id" frame_unwind method for signal trampoline ++ frames. */ ++ ++static void ++arc_sigtramp_frame_this_id (struct frame_info *this_frame, ++ void **this_cache, struct frame_id *this_id) ++{ ++ if (arc_debug) ++ debug_printf ("arc: sigtramp_frame_this_id\n"); ++ ++ if (*this_cache == NULL) ++ *this_cache = arc_make_sigtramp_frame_cache (this_frame); ++ ++ struct gdbarch *gdbarch = get_frame_arch (this_frame); ++ struct arc_frame_cache *cache = (struct arc_frame_cache *) *this_cache; ++ CORE_ADDR stack_addr = cache->prev_sp; ++ CORE_ADDR code_addr ++ = get_frame_register_unsigned (this_frame, gdbarch_pc_regnum (gdbarch)); ++ *this_id = frame_id_build (stack_addr, code_addr); ++} ++ ++/* Get a register from a signal handler frame. */ ++ ++static struct value * ++arc_sigtramp_frame_prev_register (struct frame_info *this_frame, ++ void **this_cache, int regnum) ++{ ++ if (arc_debug) ++ debug_printf ("arc: sigtramp_frame_prev_register (regnum = %d)\n", regnum); ++ ++ /* Make sure we've initialized the cache. */ ++ if (*this_cache == NULL) ++ *this_cache = arc_make_sigtramp_frame_cache (this_frame); ++ ++ struct arc_frame_cache *cache = (struct arc_frame_cache *) *this_cache; ++ return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); ++} ++ ++/* Frame sniffer for signal handler frame. Only recognize a frame if we ++ have a sigcontext_addr handler in the target dependency. */ ++ ++static int ++arc_sigtramp_frame_sniffer (const struct frame_unwind *self, ++ struct frame_info *this_frame, ++ void **this_cache) ++{ ++ struct gdbarch_tdep *tdep; ++ ++ if (arc_debug) ++ debug_printf ("arc: sigtramp_frame_sniffer\n"); ++ ++ tdep = gdbarch_tdep (get_frame_arch (this_frame)); ++ ++ /* If we have a sigcontext_addr handler, then just return 1 (same as the ++ "default_frame_sniffer ()"). */ ++ return (tdep->sigcontext_addr != NULL && tdep->is_sigtramp != NULL ++ && tdep->is_sigtramp (this_frame)); ++} ++ + /* Structure defining the ARC ordinary frame unwind functions. Since we are + the fallback unwinder, we use the default frame sniffer, which always + accepts the frame. */ +@@ -1858,6 +1956,21 @@ + NULL + }; + ++/* Structure defining the ARC signal frame unwind functions. Custom ++ sniffer is used, because this frame must be accepted only in the right ++ context. */ ++ ++static const struct frame_unwind arc_sigtramp_frame_unwind = { ++ SIGTRAMP_FRAME, ++ default_frame_unwind_stop_reason, ++ arc_sigtramp_frame_this_id, ++ arc_sigtramp_frame_prev_register, ++ NULL, ++ arc_sigtramp_frame_sniffer, ++ NULL, ++ NULL ++}; ++ + + static const struct frame_base arc_normal_base = { + &arc_frame_unwind, +@@ -2272,6 +2385,7 @@ + /* Frame unwinders and sniffers. */ + dwarf2_frame_set_init_reg (gdbarch, arc_dwarf2_frame_init_reg); + dwarf2_append_unwinders (gdbarch); ++ frame_unwind_append_unwinder (gdbarch, &arc_sigtramp_frame_unwind); + frame_unwind_append_unwinder (gdbarch, &arc_frame_unwind); + frame_base_set_default (gdbarch, &arc_normal_base); + +@@ -2350,6 +2464,15 @@ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + fprintf_unfiltered (file, "arc_dump_tdep: jb_pc = %i\n", tdep->jb_pc); ++ ++ fprintf_unfiltered (file, "arc_dump_tdep: is_sigtramp = <%s>\n", ++ host_address_to_string (tdep->is_sigtramp)); ++ fprintf_unfiltered (file, "arc_dump_tdep: sigcontext_addr = <%s>\n", ++ host_address_to_string (tdep->sigcontext_addr)); ++ fprintf_unfiltered (file, "arc_dump_tdep: sc_reg_offset = <%s>\n", ++ host_address_to_string (tdep->sc_reg_offset)); ++ fprintf_unfiltered (file, "arc_dump_tdep: sc_num_regs = %d\n", ++ tdep->sc_num_regs); + } + + /* This command accepts single argument - address of instruction to +--- a/gdb/arc-tdep.h ++++ b/gdb/arc-tdep.h +@@ -124,6 +124,19 @@ + + /* Whether target has hardware (aka zero-delay) loops. */ + bool has_hw_loops; ++ ++ /* Detect sigtramp. */ ++ bool (*is_sigtramp) (struct frame_info *); ++ ++ /* Get address of sigcontext for sigtramp. */ ++ CORE_ADDR (*sigcontext_addr) (struct frame_info *); ++ ++ /* Offset of registers in `struct sigcontext'. */ ++ const int *sc_reg_offset; ++ ++ /* Number of registers in sc_reg_offsets. Most likely a ARC_LAST_REGNUM, ++ but in theory it could be less, so it is kept separate. */ ++ int sc_num_regs; + }; + + /* Utility functions used by other ARC-specific modules. */ |