From 78f9d7654ada5b567f031f3f3463fac834b9259f Mon Sep 17 00:00:00 2001 From: Jason Thorpe Date: Sun, 26 May 2002 20:31:06 +0000 Subject: [PATCH] * ns32k-tdep.c (ns32k_breakpoint_from_pc, ns32k_frame_chain, ns32k_frame_saved_pc, ns32k_frame_args_address, ns32k_frame_locals_address, ns32k_frame_init_saved_regs, ns32k_push_dummy_frame, ns32k_pop_frame): New functions. * config/ns32k/tm-nbsd.h (FRAME_SAVED_PC): Remove. * config/ns32k/tm-umax.h (INNER_THAN): Define as core_addr_lessthan. (BREAKPOINT_FROM_PC): Define as ns32k_breakpoint_from_pc. (BREAKPOINT): Remove.. (FRAME_CHAIN): Define as ns32k_frame_chain. (FRAME_SAVED_PC): Define as ns32k_frame_saved_pc. (FRAME_ARGS_ADDRESS): Define as ns32k_frame_args_address. (FRAME_LOCALS_ADDRESS): Define as ns32k_frame_locals_address. (FRAME_FIND_SAVED_REGS): Remove. (FRAME_INIT_SAVED_REGS): Define as ns32k_frame_init_saved_regs. (PUSH_DUMMY_FRAME): Define as ns32k_push_dummy_frame. (POP_FRAME): Define as ns32k_pop_frame. --- gdb/ChangeLog | 19 +++++ gdb/config/ns32k/tm-nbsd.h | 8 -- gdb/config/ns32k/tm-umax.h | 114 +++++----------------------- gdb/ns32k-tdep.c | 149 +++++++++++++++++++++++++++++++++---- 4 files changed, 173 insertions(+), 117 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index af11644b6da..dba149fa395 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,22 @@ +2002-05-26 Jason Thorpe + + * ns32k-tdep.c (ns32k_breakpoint_from_pc, ns32k_frame_chain, + ns32k_frame_saved_pc, ns32k_frame_args_address, + ns32k_frame_locals_address, ns32k_frame_init_saved_regs, + ns32k_push_dummy_frame, ns32k_pop_frame): New functions. + * config/ns32k/tm-nbsd.h (FRAME_SAVED_PC): Remove. + * config/ns32k/tm-umax.h (INNER_THAN): Define as core_addr_lessthan. + (BREAKPOINT_FROM_PC): Define as ns32k_breakpoint_from_pc. + (BREAKPOINT): Remove.. + (FRAME_CHAIN): Define as ns32k_frame_chain. + (FRAME_SAVED_PC): Define as ns32k_frame_saved_pc. + (FRAME_ARGS_ADDRESS): Define as ns32k_frame_args_address. + (FRAME_LOCALS_ADDRESS): Define as ns32k_frame_locals_address. + (FRAME_FIND_SAVED_REGS): Remove. + (FRAME_INIT_SAVED_REGS): Define as ns32k_frame_init_saved_regs. + (PUSH_DUMMY_FRAME): Define as ns32k_push_dummy_frame. + (POP_FRAME): Define as ns32k_pop_frame. + 2002-05-26 Jason Thorpe * ns32k-tdep.c (ns32k_register_byte_32082, diff --git a/gdb/config/ns32k/tm-nbsd.h b/gdb/config/ns32k/tm-nbsd.h index ae29bcfbfb0..5081c3587aa 100644 --- a/gdb/config/ns32k/tm-nbsd.h +++ b/gdb/config/ns32k/tm-nbsd.h @@ -38,14 +38,6 @@ /* Offset to saved PC in sigcontext, from . */ #define SIGCONTEXT_PC_OFFSET 20 -#undef FRAME_SAVED_PC(FRAME) -#define FRAME_SAVED_PC(FRAME) \ - (((FRAME)->signal_handler_caller \ - ? sigtramp_saved_pc (FRAME) \ - : read_memory_integer ((FRAME)->frame + 4, 4)) \ - ) - - /* tm-umax.h assumes a 32082 fpu. We have a 32382 fpu. */ #undef REGISTER_NAME diff --git a/gdb/config/ns32k/tm-umax.h b/gdb/config/ns32k/tm-umax.h index 85838668613..8496307d509 100644 --- a/gdb/config/ns32k/tm-umax.h +++ b/gdb/config/ns32k/tm-umax.h @@ -52,11 +52,10 @@ extern CORE_ADDR umax_skip_prologue (CORE_ADDR); /* Stack grows downward. */ -#define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) +#define INNER_THAN(lhs,rhs) core_addr_lessthan ((lhs), (rhs)) -/* Sequence of bytes for breakpoint instruction. */ - -#define BREAKPOINT {0xf2} +extern const unsigned char *ns32k_breakpoint_from_pc (CORE_ADDR *, int *); +#define BREAKPOINT_FROM_PC(PCP, LENP) ns32k_breakpoint_from_pc ((PCP), (LENP)) /* Amount PC must be decremented by after a breakpoint. This is often the number of bytes in BREAKPOINT @@ -157,116 +156,41 @@ struct type *ns32k_register_virtual_type (int); /* Describe the pointer in each stack frame to the previous stack frame (its caller). */ -/* FRAME_CHAIN takes a frame's nominal address - and produces the frame's chain-pointer. */ - -/* In the case of the ns32000 series, the frame's nominal address is the FP - value, and at that address is saved previous FP value as a 4-byte word. */ - -#define FRAME_CHAIN(thisframe) \ - (!inside_entry_file ((thisframe)->pc) ? \ - read_memory_integer ((thisframe)->frame, 4) :\ - 0) - -/* Define other aspects of the stack frame. */ - -#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) - -/* Compute base of arguments. */ +CORE_ADDR ns32k_frame_chain (struct frame_info *); +#define FRAME_CHAIN(thisframe) ns32k_frame_chain ((thisframe)) -#define FRAME_ARGS_ADDRESS(fi) \ - ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \ - ((fi)->frame) : (read_register (SP_REGNUM) - 4)) +CORE_ADDR ns32k_frame_saved_pc (struct frame_info *); +#define FRAME_SAVED_PC(FRAME) ns32k_frame_saved_pc ((FRAME)) -#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) +CORE_ADDR ns32k_frame_args_address (struct frame_info *); +#define FRAME_ARGS_ADDRESS(fi) ns32k_frame_args_address ((fi)) -/* Get the address of the enter opcode for this function, if it is active. - Returns positive address > 1 if pc is between enter/exit, - 1 if pc before enter or after exit, 0 otherwise. */ - -extern CORE_ADDR ns32k_get_enter_addr (CORE_ADDR); +CORE_ADDR ns32k_frame_locals_address (struct frame_info *); +#define FRAME_LOCALS_ADDRESS(fi) ns32k_frame_locals_address ((fi)) /* Return number of args passed to a frame. Can return -1, meaning no way to tell. */ -extern int umax_frame_num_args (struct frame_info *fi); +extern int umax_frame_num_args (struct frame_info *); #define FRAME_NUM_ARGS(fi) (umax_frame_num_args ((fi))) /* Return number of bytes at start of arglist that are not really args. */ #define FRAME_ARGS_SKIP 8 -/* Put here the code to store, into a struct frame_saved_regs, - the addresses of the saved registers of frame described by FRAME_INFO. - This includes special registers such as pc and fp saved in special - ways in the stack frame. sp is even more special: - the address we return for it IS the sp for the next frame. */ - -extern int ns32k_localcount (CORE_ADDR enter_pc); - -#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ -{ \ - register int regmask, regnum; \ - int localcount; \ - register CORE_ADDR enter_addr; \ - register CORE_ADDR next_addr; \ - \ - memset (&(frame_saved_regs), '\0', sizeof (frame_saved_regs)); \ - enter_addr = ns32k_get_enter_addr ((frame_info)->pc); \ - if (enter_addr > 1) \ - { \ - regmask = read_memory_integer (enter_addr+1, 1) & 0xff; \ - localcount = ns32k_localcount (enter_addr); \ - next_addr = (frame_info)->frame + localcount; \ - for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \ - (frame_saved_regs).regs[regnum] = (regmask & 1) ? \ - (next_addr -= 4) : 0; \ - (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\ - (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\ - (frame_saved_regs).regs[FP_REGNUM] = \ - (read_memory_integer ((frame_info)->frame, 4));\ - } \ - else if (enter_addr == 1) \ - { \ - CORE_ADDR sp = read_register (SP_REGNUM); \ - (frame_saved_regs).regs[PC_REGNUM] = sp; \ - (frame_saved_regs).regs[SP_REGNUM] = sp + 4; \ - } \ -} +void ns32k_frame_init_saved_regs (struct frame_info *); +#define FRAME_INIT_SAVED_REGS(FI) ns32k_frame_init_saved_regs ((FI)) + /* Things needed for making the inferior call functions. */ -/* Push an empty stack frame, to record the current PC, etc. */ - -#define PUSH_DUMMY_FRAME \ -{ register CORE_ADDR sp = read_register (SP_REGNUM);\ - register int regnum; \ - sp = push_word (sp, read_register (PC_REGNUM)); \ - sp = push_word (sp, read_register (FP_REGNUM)); \ - write_register (FP_REGNUM, sp); \ - for (regnum = 0; regnum < 8; regnum++) \ - sp = push_word (sp, read_register (regnum)); \ - write_register (SP_REGNUM, sp); \ -} +extern void ns32k_push_dummy_frame (void); +#define PUSH_DUMMY_FRAME ns32k_push_dummy_frame () /* Discard from the stack the innermost frame, restoring all registers. */ -#define POP_FRAME \ -{ register struct frame_info *frame = get_current_frame (); \ - register CORE_ADDR fp; \ - register int regnum; \ - struct frame_saved_regs fsr; \ - struct frame_info *fi; \ - fp = frame->frame; \ - get_frame_saved_regs (frame, &fsr); \ - for (regnum = 0; regnum < 8; regnum++) \ - if (fsr.regs[regnum]) \ - write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \ - write_register (FP_REGNUM, read_memory_integer (fp, 4)); \ - write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \ - write_register (SP_REGNUM, fp + 8); \ - flush_cached_frames (); \ -} +extern void ns32k_pop_frame (void); +#define POP_FRAME ns32k_pop_frame () /* This sequence of words is the instructions enter 0xff,0 82 ff 00 diff --git a/gdb/ns32k-tdep.c b/gdb/ns32k-tdep.c index f6fb85fad2f..42c6456fabb 100644 --- a/gdb/ns32k-tdep.c +++ b/gdb/ns32k-tdep.c @@ -24,6 +24,8 @@ #include "gdbcore.h" static int sign_extend (int value, int bits); +static CORE_ADDR ns32k_get_enter_addr (CORE_ADDR); +static int ns32k_localcount (CORE_ADDR enter_pc); char * ns32k_register_name_32082 (int regno) @@ -136,6 +138,15 @@ umax_skip_prologue (CORE_ADDR pc) } return pc; } + +const unsigned char * +ns32k_breakpoint_from_pc (CORE_ADDR *pcp, int *lenp) +{ + static const unsigned char breakpoint_insn[] = { 0xf2 }; + + *lenp = sizeof (breakpoint_insn); + return breakpoint_insn; +} /* Return number of args passed to a frame. Can return -1, meaning no way to tell. @@ -208,11 +219,11 @@ flip_bytes (void *p, int count) } } -/* Return the number of locals in the current frame given a pc - pointing to the enter instruction. This is used in the macro - FRAME_FIND_SAVED_REGS. */ +/* Return the number of locals in the current frame given a + pc pointing to the enter instruction. This is used by + ns32k_frame_init_saved_regs. */ -int +static int ns32k_localcount (CORE_ADDR enter_pc) { unsigned char localtype; @@ -241,16 +252,10 @@ ns32k_about_to_return (CORE_ADDR pc) return (read_memory_integer (pc, 1) == 0x12); } - -/* - * Get the address of the enter opcode for the function - * containing PC, if there is an enter for the function, - * and if the pc is between the enter and exit. - * Returns positive address if pc is between enter/exit, - * 1 if pc before enter or after exit, 0 otherwise. - */ - -CORE_ADDR +/* Get the address of the enter opcode for this function, if it is active. + Returns positive address > 1 if pc is between enter/exit, + 1 if pc before enter or after exit, 0 otherwise. */ +static CORE_ADDR ns32k_get_enter_addr (CORE_ADDR pc) { CORE_ADDR enter_addr; @@ -275,6 +280,122 @@ ns32k_get_enter_addr (CORE_ADDR pc) return enter_addr; /* pc is between enter and exit */ } +CORE_ADDR +ns32k_frame_chain (struct frame_info *frame) +{ + /* In the case of the NS32000 series, the frame's nominal address is the + FP value, and that address is saved at the previous FP value as a + 4-byte word. */ + + if (inside_entry_file (frame->pc)) + return 0; + + return (read_memory_integer (frame->frame, 4)); +} + +CORE_ADDR +ns32k_frame_saved_pc (struct frame_info *frame) +{ + if (frame->signal_handler_caller) + return (sigtramp_saved_pc (frame)); /* XXXJRT */ + + return (read_memory_integer (frame->frame + 4, 4)); +} + +CORE_ADDR +ns32k_frame_args_address (struct frame_info *frame) +{ + if (ns32k_get_enter_addr (frame->pc) > 1) + return (frame->frame); + + return (read_register (SP_REGNUM) - 4); +} + +CORE_ADDR +ns32k_frame_locals_address (struct frame_info *frame) +{ + return (frame->frame); +} + +/* Code to initialize the addresses of the saved registers of frame described + by FRAME_INFO. This includes special registers such as pc and fp saved in + special ways in the stack frame. sp is even more special: the address we + return for it IS the sp for the next frame. */ + +void +ns32k_frame_init_saved_regs (struct frame_info *frame) +{ + int regmask, regnum; + int localcount; + CORE_ADDR enter_addr, next_addr; + + if (frame->saved_regs) + return; + + frame_saved_regs_zalloc (frame); + + enter_addr = ns32k_get_enter_addr (frame->pc); + if (enter_addr > 1) + { + regmask = read_memory_integer (enter_addr + 1, 1) & 0xff; + localcount = ns32k_localcount (enter_addr); + next_addr = frame->frame + localcount; + + for (regnum = 0; regnum < 8; regnum++) + { + if (regmask & (1 << regnum)) + frame->saved_regs[regnum] = next_addr -= 4; + } + + frame->saved_regs[SP_REGNUM] = frame->frame + 4; + frame->saved_regs[PC_REGNUM] = frame->frame + 4; + frame->saved_regs[FP_REGNUM] = read_memory_integer (frame->frame, 4); + } + else if (enter_addr == 1) + { + CORE_ADDR sp = read_register (SP_REGNUM); + frame->saved_regs[PC_REGNUM] = sp; + frame->saved_regs[SP_REGNUM] = sp + 4; + } +} + +void +ns32k_push_dummy_frame (void) +{ + CORE_ADDR sp = read_register (SP_REGNUM); + int regnum; + + sp = push_word (sp, read_register (PC_REGNUM)); + sp = push_word (sp, read_register (FP_REGNUM)); + write_register (FP_REGNUM, sp); + + for (regnum = 0; regnum < 8; regnum++) + sp = push_word (sp, read_register (regnum)); + + write_register (SP_REGNUM, sp); +} + +void +ns32k_pop_frame (void) +{ + struct frame_info *frame = get_current_frame (); + CORE_ADDR fp; + int regnum; + + fp = frame->frame; + FRAME_INIT_SAVED_REGS (frame); + + for (regnum = 0; regnum < 8; regnum++) + if (frame->saved_regs[regnum]) + write_register (regnum, + read_memory_integer (frame->saved_regs[regnum], 4)); + + write_register (FP_REGNUM, read_memory_integer (fp, 4)); + write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); + write_register (SP_REGNUM, fp + 8); + flush_cached_frames (); +} + void _initialize_ns32k_tdep (void) { -- 2.30.2