From 451fa05e5dea8d37ec1f0cb40f304e918c30ee62 Mon Sep 17 00:00:00 2001 From: Anthony Green Date: Mon, 13 Jul 2009 04:56:14 +0000 Subject: [PATCH] Add process recording support to the moxie gdb port. --- gdb/ChangeLog | 7 + gdb/moxie-tdep.c | 453 ++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 458 insertions(+), 2 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index a6c816905d..dd8186df15 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,10 @@ +2009-07-13 Anthony Green + + * moxie-tdep.c (moxie_gdbarch_init): Call + set_gdbarch_process_record. + (moxie_process_record): New. + (moxie_process_readu): New. + 2009-07-12 Michael Snyder * i386-tdep.c: Add a frame unwinder for function epilogues. diff --git a/gdb/moxie-tdep.c b/gdb/moxie-tdep.c index 200365792c..3ce9b406ee 100644 --- a/gdb/moxie-tdep.c +++ b/gdb/moxie-tdep.c @@ -36,6 +36,7 @@ #include "regcache.h" #include "trad-frame.h" #include "dis-asm.h" +#include "record.h" #include "gdb_assert.h" @@ -71,7 +72,7 @@ moxie_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) /* Implement the "breakpoint_from_pc" gdbarch method. */ const static unsigned char * -moxie_breakpoint_from_pc (struct gdbarch *gdbarch, +moxie_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr) { static unsigned char breakpoint[] = { 0x35, 0x00 }; @@ -287,7 +288,7 @@ moxie_write_pc (struct regcache *regcache, CORE_ADDR val) regcache_cooked_write_unsigned (regcache, MOXIE_PC_REGNUM, val); } -/* Implement the "unwind_pc" gdbarch method. */ +/* Implement the "unwind_sp" gdbarch method. */ static CORE_ADDR moxie_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) @@ -474,6 +475,450 @@ moxie_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) return frame_id_build (sp, get_frame_pc (this_frame)); } +/* Read an unsigned integer from the inferior, and adjust + endianess. */ +static ULONGEST +moxie_process_readu (CORE_ADDR addr, char *buf, + int length, enum bfd_endian byte_order) +{ + if (target_read_memory (addr, buf, length)) + { + if (record_debug) + printf_unfiltered (_("Process record: error reading memory at " + "addr 0x%s len = %d.\n"), + paddress (target_gdbarch, addr), length); + return -1; + } + + return extract_unsigned_integer (buf, length, byte_order); +} + +/* Parse the current instruction and record the values of the registers and + memory that will be changed in current instruction to "record_arch_list". + Return -1 if something wrong. */ + +int +moxie_process_record (struct gdbarch *gdbarch, struct regcache *regcache, + CORE_ADDR addr) +{ + gdb_byte buf[4]; + uint16_t inst; + uint32_t tmpu32; + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); + + if (record_debug > 1) + fprintf_unfiltered (gdb_stdlog, "Process record: moxie_process_record " + "addr = 0x%s\n", + paddress (target_gdbarch, addr)); + + inst = (uint16_t) moxie_process_readu (addr, buf, 2, byte_order); + + /* Decode instruction. */ + if (inst & (1 << 15)) + { + if (inst & (1 << 14)) + { + /* This is a Form 3 instruction. */ + int opcode = (inst >> 10 & 0xf); + + switch (opcode) + { + case 0x00: /* beq */ + case 0x01: /* bne */ + case 0x02: /* blt */ + case 0x03: /* bgt */ + case 0x04: /* bltu */ + case 0x05: /* bgtu */ + case 0x06: /* bge */ + case 0x07: /* ble */ + case 0x08: /* bgeu */ + case 0x09: /* bleu */ + /* Do nothing. */ + break; + default: + { + /* Do nothing. */ + break; + } + } + } + else + { + /* This is a Form 2 instruction. */ + int opcode = (inst >> 12 & 0x3); + switch (opcode) + { + case 0x00: /* inc */ + case 0x01: /* dec */ + case 0x02: /* gsr */ + { + int reg = (inst >> 8) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x03: /* ssr */ + { + /* Do nothing until GDB learns about moxie's special + registers. */ + } + break; + default: + /* Do nothing. */ + break; + } + } + } + else + { + /* This is a Form 1 instruction. */ + int opcode = inst >> 8; + + switch (opcode) + { + case 0x00: /* nop */ + /* Do nothing. */ + break; + case 0x01: /* ldi.l (immediate) */ + case 0x02: /* mov (register-to-register) */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x03: /* jsra */ + { + regcache_raw_read (regcache, + MOXIE_SP_REGNUM, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + if (record_arch_list_add_reg (regcache, MOXIE_FP_REGNUM) + || (record_arch_list_add_reg (regcache, + MOXIE_SP_REGNUM)) + || record_arch_list_add_mem (tmpu32 - 12, 12)) + return -1; + } + break; + case 0x04: /* ret */ + { + if (record_arch_list_add_reg (regcache, MOXIE_FP_REGNUM) + || (record_arch_list_add_reg (regcache, + MOXIE_SP_REGNUM))) + return -1; + } + break; + case 0x05: /* add.l */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x06: /* push */ + { + int reg = (inst >> 4) & 0xf; + regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + if (record_arch_list_add_reg (regcache, reg) + || record_arch_list_add_mem (tmpu32 - 4, 4)) + return -1; + } + break; + case 0x07: /* pop */ + { + int a = (inst >> 4) & 0xf; + int b = inst & 0xf; + if (record_arch_list_add_reg (regcache, a) + || record_arch_list_add_reg (regcache, b)) + return -1; + } + break; + case 0x08: /* lda.l */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x09: /* sta.l */ + { + tmpu32 = (uint32_t) moxie_process_readu (addr+2, buf, + 4, byte_order); + if (record_arch_list_add_mem (tmpu32, 4)) + return -1; + } + break; + case 0x0a: /* ld.l (register indirect) */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x0b: /* st.l */ + { + int reg = (inst >> 4) & 0xf; + regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + if (record_arch_list_add_mem (tmpu32, 4)) + return -1; + } + break; + case 0x0c: /* ldo.l */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x0d: /* sto.l */ + { + int reg = (inst >> 4) & 0xf; + uint32_t offset = (uint32_t) moxie_process_readu (addr+2, buf, 4, + byte_order); + regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + tmpu32 += offset; + if (record_arch_list_add_mem (tmpu32, 4)) + return -1; + } + break; + case 0x0e: /* cmp */ + { + if (record_arch_list_add_reg (regcache, MOXIE_CC_REGNUM)) + return -1; + } + break; + case 0x0f: + case 0x10: + case 0x11: + case 0x12: + case 0x13: + case 0x14: + case 0x15: + case 0x16: + case 0x17: + case 0x18: + { + /* Do nothing. */ + break; + } + case 0x19: /* jsr */ + { + regcache_raw_read (regcache, + MOXIE_SP_REGNUM, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + if (record_arch_list_add_reg (regcache, MOXIE_FP_REGNUM) + || (record_arch_list_add_reg (regcache, + MOXIE_SP_REGNUM)) + || record_arch_list_add_mem (tmpu32 - 12, 12)) + return -1; + } + break; + case 0x1a: /* jmpa */ + { + /* Do nothing. */ + } + break; + case 0x1b: /* ldi.b (immediate) */ + case 0x1c: /* ld.b (register indirect) */ + case 0x1d: /* lda.b */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x1e: /* st.b */ + { + int reg = (inst >> 4) & 0xf; + regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + if (record_arch_list_add_mem (tmpu32, 1)) + return -1; + } + break; + case 0x1f: /* sta.b */ + { + tmpu32 = moxie_process_readu (addr+2, (char *) buf, + 4, byte_order); + if (record_arch_list_add_mem (tmpu32, 1)) + return -1; + } + break; + case 0x20: /* ldi.s (immediate) */ + case 0x21: /* ld.s (register indirect) */ + case 0x22: /* lda.s */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x23: /* st.s */ + { + int reg = (inst >> 4) & 0xf; + regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + if (record_arch_list_add_mem (tmpu32, 2)) + return -1; + } + break; + case 0x24: /* sta.s */ + { + tmpu32 = moxie_process_readu (addr+2, (char *) buf, + 4, byte_order); + if (record_arch_list_add_mem (tmpu32, 2)) + return -1; + } + break; + case 0x25: /* jmp */ + { + /* Do nothing. */ + } + break; + case 0x26: /* and */ + case 0x27: /* lshr */ + case 0x28: /* ashl */ + case 0x29: /* sub.l */ + case 0x2a: /* neg */ + case 0x2b: /* or */ + case 0x2c: /* not */ + case 0x2d: /* ashr */ + case 0x2e: /* xor */ + case 0x2f: /* mul.l */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x30: /* swi */ + { + /* We currently implement support for libgloss' + system calls. */ + + int inum = moxie_process_readu (addr+2, (char *) buf, + 4, byte_order); + + switch (inum) + { + case 0x1: /* SYS_exit */ + { + /* Do nothing. */ + } + break; + case 0x2: /* SYS_open */ + { + if (record_arch_list_add_reg (regcache, RET1_REGNUM)) + return -1; + } + break; + case 0x4: /* SYS_read */ + { + uint32_t length, ptr; + + /* Read buffer pointer is in $r1. */ + regcache_raw_read (regcache, 3, (gdb_byte *) & ptr); + ptr = extract_unsigned_integer ((gdb_byte *) & ptr, + 4, byte_order); + + /* String length is at 0x12($fp) */ + regcache_raw_read (regcache, + MOXIE_FP_REGNUM, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + length = moxie_process_readu (tmpu32+20, (char *) buf, + 4, byte_order); + + if (record_arch_list_add_mem (ptr, length)) + return -1; + } + break; + case 0x5: /* SYS_write */ + { + if (record_arch_list_add_reg (regcache, RET1_REGNUM)) + return -1; + } + break; + default: + break; + } + } + break; + case 0x31: /* div.l */ + case 0x32: /* udiv.l */ + case 0x33: /* mod.l */ + case 0x34: /* umod.l */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x35: /* brk */ + /* Do nothing. */ + break; + case 0x36: /* ldo.b */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x37: /* sto.b */ + { + int reg = (inst >> 4) & 0xf; + uint32_t offset = (uint32_t) moxie_process_readu (addr+2, buf, 4, + byte_order); + regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + tmpu32 += offset; + if (record_arch_list_add_mem (tmpu32, 1)) + return -1; + } + break; + case 0x38: /* ldo.s */ + { + int reg = (inst >> 4) & 0xf; + if (record_arch_list_add_reg (regcache, reg)) + return -1; + } + break; + case 0x39: /* sto.s */ + { + int reg = (inst >> 4) & 0xf; + uint32_t offset = (uint32_t) moxie_process_readu (addr+2, buf, 4, + byte_order); + regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); + tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, + 4, byte_order); + tmpu32 += offset; + if (record_arch_list_add_mem (tmpu32, 2)) + return -1; + } + break; + default: + /* Do nothing. */ + break; + } + } + + if (record_arch_list_add_reg (regcache, MOXIE_PC_REGNUM)) + return -1; + if (record_arch_list_add_end ()) + return -1; + return 0; +} + /* Allocate and initialize the moxie gdbarch object. */ static struct gdbarch * @@ -497,6 +942,7 @@ moxie_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_num_regs (gdbarch, MOXIE_NUM_REGS); set_gdbarch_sp_regnum (gdbarch, MOXIE_SP_REGNUM); + set_gdbarch_pc_regnum (gdbarch, MOXIE_PC_REGNUM); set_gdbarch_register_name (gdbarch, moxie_register_name); set_gdbarch_register_type (gdbarch, moxie_register_type); @@ -527,6 +973,9 @@ moxie_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) /* Support simple overlay manager. */ set_gdbarch_overlay_update (gdbarch, simple_overlay_update); + /* Support reverse debugging. */ + set_gdbarch_process_record (gdbarch, moxie_process_record); + return gdbarch; }