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Remove the non-EABI code from the DDB stack unwinder, we only support the
ARM EABI now.
This commit is contained in:
Andrew Turner
parent
90e8f62386
commit
ee23449b37
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=278578
@ -50,7 +50,6 @@ __FBSDID("$FreeBSD$");
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#include <ddb/db_sym.h>
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#include <ddb/db_output.h>
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#ifdef __ARM_EABI__
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/*
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* Definitions for the instruction interpreter.
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*
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@ -453,131 +452,6 @@ db_stack_trace_cmd(struct unwind_state *state)
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}
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}
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}
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#endif
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/*
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* APCS stack frames are awkward beasts, so I don't think even trying to use
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* a structure to represent them is a good idea.
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*
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* Here's the diagram from the APCS. Increasing address is _up_ the page.
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*
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* save code pointer [fp] <- fp points to here
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* return link value [fp, #-4]
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* return sp value [fp, #-8]
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* return fp value [fp, #-12]
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* [saved v7 value]
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* [saved v6 value]
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* [saved v5 value]
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* [saved v4 value]
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* [saved v3 value]
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* [saved v2 value]
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* [saved v1 value]
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* [saved a4 value]
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* [saved a3 value]
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* [saved a2 value]
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* [saved a1 value]
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*
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* The save code pointer points twelve bytes beyond the start of the
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* code sequence (usually a single STM) that created the stack frame.
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* We have to disassemble it if we want to know which of the optional
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* fields are actually present.
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*/
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#ifndef __ARM_EABI__ /* The frame format is differend in AAPCS */
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static void
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db_stack_trace_cmd(db_expr_t addr, db_expr_t count, boolean_t kernel_only)
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{
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u_int32_t *frame, *lastframe;
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c_db_sym_t sym;
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const char *name;
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db_expr_t value;
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db_expr_t offset;
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int scp_offset;
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frame = (u_int32_t *)addr;
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lastframe = NULL;
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scp_offset = -(get_pc_str_offset() >> 2);
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while (count-- && frame != NULL && !db_pager_quit) {
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db_addr_t scp;
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u_int32_t savecode;
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int r;
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u_int32_t *rp;
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const char *sep;
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/*
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* In theory, the SCP isn't guaranteed to be in the function
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* that generated the stack frame. We hope for the best.
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*/
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scp = frame[FR_SCP];
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sym = db_search_symbol(scp, DB_STGY_ANY, &offset);
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if (sym == C_DB_SYM_NULL) {
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value = 0;
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name = "(null)";
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} else
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db_symbol_values(sym, &name, &value);
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db_printf("%s() at ", name);
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db_printsym(scp, DB_STGY_PROC);
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db_printf("\n");
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#ifdef __PROG26
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db_printf("\tscp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV] & R15_PC);
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db_printsym(frame[FR_RLV] & R15_PC, DB_STGY_PROC);
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db_printf(")\n");
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#else
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db_printf("\tscp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV]);
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db_printsym(frame[FR_RLV], DB_STGY_PROC);
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db_printf(")\n");
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#endif
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db_printf("\trsp=0x%08x rfp=0x%08x", frame[FR_RSP], frame[FR_RFP]);
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savecode = ((u_int32_t *)scp)[scp_offset];
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if ((savecode & 0x0e100000) == 0x08000000) {
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/* Looks like an STM */
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rp = frame - 4;
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sep = "\n\t";
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for (r = 10; r >= 0; r--) {
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if (savecode & (1 << r)) {
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db_printf("%sr%d=0x%08x",
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sep, r, *rp--);
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sep = (frame - rp) % 4 == 2 ?
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"\n\t" : " ";
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}
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}
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}
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db_printf("\n");
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/*
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* Switch to next frame up
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*/
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if (frame[FR_RFP] == 0)
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break; /* Top of stack */
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lastframe = frame;
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frame = (u_int32_t *)(frame[FR_RFP]);
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if (INKERNEL((int)frame)) {
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/* staying in kernel */
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if (frame <= lastframe) {
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db_printf("Bad frame pointer: %p\n", frame);
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break;
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}
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} else if (INKERNEL((int)lastframe)) {
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/* switch from user to kernel */
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if (kernel_only)
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break; /* kernel stack only */
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} else {
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/* in user */
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if (frame <= lastframe) {
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db_printf("Bad user frame pointer: %p\n",
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frame);
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break;
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}
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}
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}
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}
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#endif
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/* XXX stubs */
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void
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@ -600,24 +474,18 @@ db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
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int
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db_trace_thread(struct thread *thr, int count)
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{
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#ifdef __ARM_EABI__
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struct unwind_state state;
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#endif
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struct pcb *ctx;
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if (thr != curthread) {
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ctx = kdb_thr_ctx(thr);
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#ifdef __ARM_EABI__
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state.registers[FP] = ctx->pcb_regs.sf_r11;
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state.registers[SP] = ctx->pcb_regs.sf_sp;
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state.registers[LR] = ctx->pcb_regs.sf_lr;
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state.registers[PC] = ctx->pcb_regs.sf_pc;
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db_stack_trace_cmd(&state);
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#else
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db_stack_trace_cmd(ctx->pcb_regs.sf_r11, -1, TRUE);
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#endif
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} else
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db_trace_self();
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return (0);
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@ -626,7 +494,6 @@ db_trace_thread(struct thread *thr, int count)
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void
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db_trace_self(void)
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{
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#ifdef __ARM_EABI__
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struct unwind_state state;
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uint32_t sp;
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@ -639,10 +506,4 @@ db_trace_self(void)
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state.registers[PC] = (uint32_t)db_trace_self;
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db_stack_trace_cmd(&state);
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#else
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db_addr_t addr;
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addr = (db_addr_t)__builtin_frame_address(0);
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db_stack_trace_cmd(addr, -1, FALSE);
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#endif
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}
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