/* Common target dependent code for GDB on ARM systems.
- Copyright (C) 2002, 2003, 2007, 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2002-2020 Free Software Foundation, Inc.
This file is part of GDB.
#define ARM_TDEP_H
/* Forward declarations. */
-struct gdbarch;
struct regset;
+struct address_space;
+struct get_next_pcs;
+struct arm_get_next_pcs;
+struct gdb_get_next_pcs;
-/* Register numbers of various important registers. */
-
-enum gdb_regnum {
- ARM_A1_REGNUM = 0, /* first integer-like argument */
- ARM_A4_REGNUM = 3, /* last integer-like argument */
- ARM_AP_REGNUM = 11,
- ARM_IP_REGNUM = 12,
- ARM_SP_REGNUM = 13, /* Contains address of top of stack */
- ARM_LR_REGNUM = 14, /* address to return to from a function call */
- ARM_PC_REGNUM = 15, /* Contains program counter */
- ARM_F0_REGNUM = 16, /* first floating point register */
- ARM_F3_REGNUM = 19, /* last floating point argument register */
- ARM_F7_REGNUM = 23, /* last floating point register */
- ARM_FPS_REGNUM = 24, /* floating point status register */
- ARM_PS_REGNUM = 25, /* Contains processor status */
- ARM_WR0_REGNUM, /* WMMX data registers. */
- ARM_WR15_REGNUM = ARM_WR0_REGNUM + 15,
- ARM_WC0_REGNUM, /* WMMX control registers. */
- ARM_WCSSF_REGNUM = ARM_WC0_REGNUM + 2,
- ARM_WCASF_REGNUM = ARM_WC0_REGNUM + 3,
- ARM_WC7_REGNUM = ARM_WC0_REGNUM + 7,
- ARM_WCGR0_REGNUM, /* WMMX general purpose registers. */
- ARM_WCGR3_REGNUM = ARM_WCGR0_REGNUM + 3,
- ARM_WCGR7_REGNUM = ARM_WCGR0_REGNUM + 7,
- ARM_D0_REGNUM, /* VFP double-precision registers. */
- ARM_D31_REGNUM = ARM_D0_REGNUM + 31,
-
- ARM_NUM_REGS,
-
- /* Other useful registers. */
- ARM_FP_REGNUM = 11, /* Frame register in ARM code, if used. */
- THUMB_FP_REGNUM = 7, /* Frame register in Thumb code, if used. */
- ARM_NUM_ARG_REGS = 4,
- ARM_LAST_ARG_REGNUM = ARM_A4_REGNUM,
- ARM_NUM_FP_ARG_REGS = 4,
- ARM_LAST_FP_ARG_REGNUM = ARM_F3_REGNUM
-};
+/* Set to true if the 32-bit mode is in use. */
+
+extern bool arm_apcs_32;
-/* Size of integer registers. */
-#define INT_REGISTER_SIZE 4
+#include "gdbarch.h"
+#include "arch/arm.h"
+#include "infrun.h"
-/* Say how long FP registers are. Used for documentation purposes and
- code readability in this header. IEEE extended doubles are 80
- bits. DWORD aligned they use 96 bits. */
-#define FP_REGISTER_SIZE 12
+#include <vector>
/* Number of machine registers. The only define actually required
is gdbarch_num_regs. The other definitions are used for documentation
#define NUM_GREGS 16 /* Number of general purpose registers. */
-/* Instruction condition field values. */
-#define INST_EQ 0x0
-#define INST_NE 0x1
-#define INST_CS 0x2
-#define INST_CC 0x3
-#define INST_MI 0x4
-#define INST_PL 0x5
-#define INST_VS 0x6
-#define INST_VC 0x7
-#define INST_HI 0x8
-#define INST_LS 0x9
-#define INST_GE 0xa
-#define INST_LT 0xb
-#define INST_GT 0xc
-#define INST_LE 0xd
-#define INST_AL 0xe
-#define INST_NV 0xf
-
-#define FLAG_N 0x80000000
-#define FLAG_Z 0x40000000
-#define FLAG_C 0x20000000
-#define FLAG_V 0x10000000
-
-#define CPSR_T 0x20
/* Type of floating-point code in use by inferior. There are really 3 models
that are traditionally supported (plus the endianness issue), but gcc can
enum arm_float_model fp_model; /* Floating point calling conventions. */
- int have_fpa_registers; /* Does the target report the FPA registers? */
- int have_vfp_registers; /* Does the target report the VFP registers? */
- int have_vfp_pseudos; /* Are we synthesizing the single precision
+ bool have_fpa_registers; /* Does the target report the FPA registers? */
+ bool have_wmmx_registers; /* Does the target report the WMMX registers? */
+ /* The number of VFP registers reported by the target. It is zero
+ if VFP registers are not supported. */
+ int vfp_register_count;
+ bool have_vfp_pseudos; /* Are we synthesizing the single precision
VFP registers? */
- int have_neon_pseudos; /* Are we synthesizing the quad precision
+ bool have_neon_pseudos; /* Are we synthesizing the quad precision
NEON registers? Requires
have_vfp_pseudos. */
- int have_neon; /* Do we have a NEON unit? */
+ bool have_neon; /* Do we have a NEON unit? */
+ bool is_m; /* Does the target follow the "M" profile. */
CORE_ADDR lowest_pc; /* Lowest address at which instructions
will appear. */
- const char *arm_breakpoint; /* Breakpoint pattern for an ARM insn. */
+ const gdb_byte *arm_breakpoint; /* Breakpoint pattern for an ARM insn. */
int arm_breakpoint_size; /* And its size. */
- const char *thumb_breakpoint; /* Breakpoint pattern for an ARM insn. */
+ const gdb_byte *thumb_breakpoint; /* Breakpoint pattern for a Thumb insn. */
int thumb_breakpoint_size; /* And its size. */
- int jb_pc; /* Offset to PC value in jump buffer.
+ /* If the Thumb breakpoint is an undefined instruction (which is
+ affected by IT blocks) rather than a BKPT instruction (which is
+ not), then we need a 32-bit Thumb breakpoint to preserve the
+ instruction count in IT blocks. */
+ const gdb_byte *thumb2_breakpoint;
+ int thumb2_breakpoint_size;
+
+ int jb_pc; /* Offset to PC value in jump buffer.
If this is negative, longjmp support
will be disabled. */
size_t jb_elt_size; /* And the size of each entry in the buf. */
/* Convention for returning structures. */
enum struct_return struct_return;
- /* Cached core file helpers. */
- struct regset *gregset, *fpregset;
-
/* ISA-specific data types. */
struct type *arm_ext_type;
struct type *neon_double_type;
struct type *neon_quad_type;
+
+ /* syscall record. */
+ int (*arm_syscall_record) (struct regcache *regcache, unsigned long svc_number);
+};
+
+/* Structures used for displaced stepping. */
+
+/* The maximum number of temporaries available for displaced instructions. */
+#define DISPLACED_TEMPS 16
+/* The maximum number of modified instructions generated for one single-stepped
+ instruction, including the breakpoint (usually at the end of the instruction
+ sequence) and any scratch words, etc. */
+#define ARM_DISPLACED_MODIFIED_INSNS 8
+
+struct arm_displaced_step_copy_insn_closure : public displaced_step_copy_insn_closure
+{
+ ULONGEST tmp[DISPLACED_TEMPS];
+ int rd;
+ int wrote_to_pc;
+ union
+ {
+ struct
+ {
+ int xfersize;
+ int rn; /* Writeback register. */
+ unsigned int immed : 1; /* Offset is immediate. */
+ unsigned int writeback : 1; /* Perform base-register writeback. */
+ unsigned int restore_r4 : 1; /* Used r4 as scratch. */
+ } ldst;
+
+ struct
+ {
+ unsigned long dest;
+ unsigned int link : 1;
+ unsigned int exchange : 1;
+ unsigned int cond : 4;
+ } branch;
+
+ struct
+ {
+ unsigned int regmask;
+ int rn;
+ CORE_ADDR xfer_addr;
+ unsigned int load : 1;
+ unsigned int user : 1;
+ unsigned int increment : 1;
+ unsigned int before : 1;
+ unsigned int writeback : 1;
+ unsigned int cond : 4;
+ } block;
+
+ struct
+ {
+ unsigned int immed : 1;
+ } preload;
+
+ struct
+ {
+ /* If non-NULL, override generic SVC handling (e.g. for a particular
+ OS). */
+ int (*copy_svc_os) (struct gdbarch *gdbarch, struct regcache *regs,
+ arm_displaced_step_copy_insn_closure *dsc);
+ } svc;
+ } u;
+
+ /* The size of original instruction, 2 or 4. */
+ unsigned int insn_size;
+ /* True if the original insn (and thus all replacement insns) are Thumb
+ instead of ARM. */
+ unsigned int is_thumb;
+
+ /* The slots in the array is used in this way below,
+ - ARM instruction occupies one slot,
+ - Thumb 16 bit instruction occupies one slot,
+ - Thumb 32-bit instruction occupies *two* slots, one part for each. */
+ unsigned long modinsn[ARM_DISPLACED_MODIFIED_INSNS];
+ int numinsns;
+ CORE_ADDR insn_addr;
+ CORE_ADDR scratch_base;
+ void (*cleanup) (struct gdbarch *, struct regcache *,
+ arm_displaced_step_copy_insn_closure *);
};
+/* Values for the WRITE_PC argument to displaced_write_reg. If the register
+ write may write to the PC, specifies the way the CPSR T bit, etc. is
+ modified by the instruction. */
+
+enum pc_write_style
+{
+ BRANCH_WRITE_PC,
+ BX_WRITE_PC,
+ LOAD_WRITE_PC,
+ ALU_WRITE_PC,
+ CANNOT_WRITE_PC
+};
+
+extern void
+ arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
+ CORE_ADDR to, struct regcache *regs,
+ arm_displaced_step_copy_insn_closure *dsc);
+extern void
+ arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from,
+ CORE_ADDR to, arm_displaced_step_copy_insn_closure *dsc);
+extern ULONGEST
+ displaced_read_reg (struct regcache *regs, arm_displaced_step_copy_insn_closure *dsc,
+ int regno);
+extern void
+ displaced_write_reg (struct regcache *regs,
+ arm_displaced_step_copy_insn_closure *dsc, int regno,
+ ULONGEST val, enum pc_write_style write_pc);
CORE_ADDR arm_skip_stub (struct frame_info *, CORE_ADDR);
-CORE_ADDR arm_get_next_pc (struct frame_info *, CORE_ADDR);
-int arm_software_single_step (struct frame_info *);
-/* Functions exported from armbsd-tdep.h. */
+ULONGEST arm_get_next_pcs_read_memory_unsigned_integer (CORE_ADDR memaddr,
+ int len,
+ int byte_order);
+
+CORE_ADDR arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs *self,
+ CORE_ADDR val);
+
+int arm_get_next_pcs_is_thumb (struct arm_get_next_pcs *self);
+
+std::vector<CORE_ADDR> arm_software_single_step (struct regcache *);
+int arm_is_thumb (struct regcache *regcache);
+int arm_frame_is_thumb (struct frame_info *frame);
+
+extern void arm_displaced_step_fixup (struct gdbarch *,
+ struct displaced_step_copy_insn_closure *,
+ CORE_ADDR, CORE_ADDR, struct regcache *);
+
+/* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode. */
+extern int arm_psr_thumb_bit (struct gdbarch *);
+
+/* Is the instruction at the given memory address a Thumb or ARM
+ instruction? */
+extern int arm_pc_is_thumb (struct gdbarch *, CORE_ADDR);
+
+extern int arm_process_record (struct gdbarch *gdbarch,
+ struct regcache *regcache, CORE_ADDR addr);
+/* Functions exported from arm-bsd-tdep.h. */
/* Return the appropriate register set for the core section identified
by SECT_NAME and SECT_SIZE. */
-extern const struct regset *
- armbsd_regset_from_core_section (struct gdbarch *gdbarch,
- const char *sect_name, size_t sect_size);
+extern void
+ armbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache);
+
+/* Get the correct Arm target description with given FP hardware type. */
+const target_desc *arm_read_description (arm_fp_type fp_type);
+
+/* Get the correct Arm M-Profile target description with given hardware
+ type. */
+const target_desc *arm_read_mprofile_description (arm_m_profile_type m_type);
#endif /* arm-tdep.h */
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