diff options
Diffstat (limited to 'gdb/arc-linux-tdep.c')
| -rw-r--r-- | gdb/arc-linux-tdep.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/gdb/arc-linux-tdep.c b/gdb/arc-linux-tdep.c index 36f3245..9ff5f12 100644 --- a/gdb/arc-linux-tdep.c +++ b/gdb/arc-linux-tdep.c @@ -27,7 +27,65 @@ /* ARC header files. */ #include "opcodes/arc-dis.h" +#include "arc-linux-tdep.h" #include "arc-tdep.h" +#include "arch/arc.h" + +#define REGOFF(offset) (offset * ARC_REGISTER_SIZE) + +/* arc_linux_core_reg_offsets[i] is the offset in the .reg section of GDB + regnum i. Array index is an internal GDB register number, as defined in + arc-tdep.h:arc_regnum. + + From include/uapi/asm/ptrace.h in the ARC Linux sources. */ + +/* The layout of this struct is tightly bound to "arc_regnum" enum + in arc-tdep.h. Any change of order in there, must be reflected + here as well. */ +static const int arc_linux_core_reg_offsets[] = { + /* R0 - R12. */ + REGOFF (22), REGOFF (21), REGOFF (20), REGOFF (19), + REGOFF (18), REGOFF (17), REGOFF (16), REGOFF (15), + REGOFF (14), REGOFF (13), REGOFF (12), REGOFF (11), + REGOFF (10), + + /* R13 - R25. */ + REGOFF (37), REGOFF (36), REGOFF (35), REGOFF (34), + REGOFF (33), REGOFF (32), REGOFF (31), REGOFF (30), + REGOFF (29), REGOFF (28), REGOFF (27), REGOFF (26), + REGOFF (25), + + REGOFF (9), /* R26 (GP) */ + REGOFF (8), /* FP */ + REGOFF (23), /* SP */ + ARC_OFFSET_NO_REGISTER, /* ILINK */ + ARC_OFFSET_NO_REGISTER, /* R30 */ + REGOFF (7), /* BLINK */ + + /* R32 - R59. */ + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, ARC_OFFSET_NO_REGISTER, + ARC_OFFSET_NO_REGISTER, + + REGOFF (4), /* LP_COUNT */ + ARC_OFFSET_NO_REGISTER, /* RESERVED */ + ARC_OFFSET_NO_REGISTER, /* LIMM */ + ARC_OFFSET_NO_REGISTER, /* PCL */ + + REGOFF (39), /* PC */ + REGOFF (5), /* STATUS32 */ + REGOFF (2), /* LP_START */ + REGOFF (3), /* LP_END */ + REGOFF (1), /* BTA */ + REGOFF (6) /* ERET */ +}; /* Implement the "cannot_fetch_register" gdbarch method. */ @@ -227,6 +285,136 @@ arc_linux_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) } } +void +arc_linux_supply_gregset (const struct regset *regset, + struct regcache *regcache, + int regnum, const void *gregs, size_t size) +{ + gdb_static_assert (ARC_LAST_REGNUM + < ARRAY_SIZE (arc_linux_core_reg_offsets)); + + const bfd_byte *buf = (const bfd_byte *) gregs; + + for (int reg = 0; reg <= ARC_LAST_REGNUM; reg++) + if (arc_linux_core_reg_offsets[reg] != ARC_OFFSET_NO_REGISTER) + regcache->raw_supply (reg, buf + arc_linux_core_reg_offsets[reg]); +} + +void +arc_linux_supply_v2_regset (const struct regset *regset, + struct regcache *regcache, int regnum, + const void *v2_regs, size_t size) +{ + const bfd_byte *buf = (const bfd_byte *) v2_regs; + + /* user_regs_arcv2 is defined in linux arch/arc/include/uapi/asm/ptrace.h. */ + regcache->raw_supply (ARC_R30_REGNUM, buf); + regcache->raw_supply (ARC_R58_REGNUM, buf + REGOFF (1)); + regcache->raw_supply (ARC_R59_REGNUM, buf + REGOFF (2)); +} + +/* Populate BUF with register REGNUM from the REGCACHE. */ + +static void +collect_register (const struct regcache *regcache, struct gdbarch *gdbarch, + int regnum, gdb_byte *buf) +{ + /* Skip non-existing registers. */ + if ((arc_linux_core_reg_offsets[regnum] == ARC_OFFSET_NO_REGISTER)) + return; + + /* The address where the execution has stopped is in pseudo-register + STOP_PC. However, when kernel code is returning from the exception, + it uses the value from ERET register. Since, TRAP_S (the breakpoint + instruction) commits, the ERET points to the next instruction. In + other words: ERET != STOP_PC. To jump back from the kernel code to + the correct address, ERET must be overwritten by GDB's STOP_PC. Else, + the program will continue at the address after the current instruction. + */ + if (regnum == gdbarch_pc_regnum (gdbarch)) + regnum = ARC_ERET_REGNUM; + regcache->raw_collect (regnum, buf + arc_linux_core_reg_offsets[regnum]); +} + +void +arc_linux_collect_gregset (const struct regset *regset, + const struct regcache *regcache, + int regnum, void *gregs, size_t size) +{ + gdb_static_assert (ARC_LAST_REGNUM + < ARRAY_SIZE (arc_linux_core_reg_offsets)); + + gdb_byte *buf = (gdb_byte *) gregs; + struct gdbarch *gdbarch = regcache->arch (); + + /* regnum == -1 means writing all the registers. */ + if (regnum == -1) + for (int reg = 0; reg <= ARC_LAST_REGNUM; reg++) + collect_register (regcache, gdbarch, reg, buf); + else if (regnum <= ARC_LAST_REGNUM) + collect_register (regcache, gdbarch, regnum, buf); + else + gdb_assert_not_reached ("Invalid regnum in arc_linux_collect_gregset."); +} + +void +arc_linux_collect_v2_regset (const struct regset *regset, + const struct regcache *regcache, int regnum, + void *v2_regs, size_t size) +{ + bfd_byte *buf = (bfd_byte *) v2_regs; + + regcache->raw_collect (ARC_R30_REGNUM, buf); + regcache->raw_collect (ARC_R58_REGNUM, buf + REGOFF (1)); + regcache->raw_collect (ARC_R59_REGNUM, buf + REGOFF (2)); +} + +/* Linux regset definitions. */ + +static const struct regset arc_linux_gregset = { + arc_linux_core_reg_offsets, + arc_linux_supply_gregset, + arc_linux_collect_gregset, +}; + +static const struct regset arc_linux_v2_regset = { + NULL, + arc_linux_supply_v2_regset, + arc_linux_collect_v2_regset, +}; + +/* Implement the `iterate_over_regset_sections` gdbarch method. */ + +static void +arc_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, + iterate_over_regset_sections_cb *cb, + void *cb_data, + const struct regcache *regcache) +{ + /* There are 40 registers in Linux user_regs_struct, although some of + them are now just a mere paddings, kept to maintain binary + compatibility with older tools. */ + const int sizeof_gregset = 40 * ARC_REGISTER_SIZE; + + cb (".reg", sizeof_gregset, sizeof_gregset, &arc_linux_gregset, NULL, + cb_data); + cb (".reg-arc-v2", ARC_LINUX_SIZEOF_V2_REGSET, ARC_LINUX_SIZEOF_V2_REGSET, + &arc_linux_v2_regset, NULL, cb_data); +} + +/* Implement the `core_read_description` gdbarch method. */ + +static const struct target_desc * +arc_linux_core_read_description (struct gdbarch *gdbarch, + struct target_ops *target, + bfd *abfd) +{ + arc_arch_features features + = arc_arch_features_create (abfd, + gdbarch_bfd_arch_info (gdbarch)->mach); + return arc_lookup_target_description (features); +} + /* Initialization specific to Linux environment. */ static void @@ -260,6 +448,9 @@ arc_linux_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch) set_gdbarch_software_single_step (gdbarch, arc_linux_software_single_step); set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); set_gdbarch_skip_solib_resolver (gdbarch, arc_linux_skip_solib_resolver); + set_gdbarch_iterate_over_regset_sections + (gdbarch, arc_linux_iterate_over_regset_sections); + set_gdbarch_core_read_description (gdbarch, arc_linux_core_read_description); /* GNU/Linux uses SVR4-style shared libraries, with 32-bit ints, longs and pointers (ILP32). */ |