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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (c) 2025, Oracle and/or its affiliates. */
#include <objtool/trace.h>
bool trace;int trace_depth;
/* * Macros to trace CFI state attributes changes. */
#define TRACE_CFI_ATTR(attr, prev, next, fmt, ...) \({ \ if ((prev)->attr != (next)->attr) \ TRACE("%s=" fmt " ", #attr, __VA_ARGS__); \})
#define TRACE_CFI_ATTR_BOOL(attr, prev, next) \ TRACE_CFI_ATTR(attr, prev, next, \ "%s", (next)->attr ? "true" : "false")
#define TRACE_CFI_ATTR_NUM(attr, prev, next, fmt) \ TRACE_CFI_ATTR(attr, prev, next, fmt, (next)->attr)
#define CFI_REG_NAME_MAXLEN 16
/* * Return the name of a register. Note that the same static buffer * is returned if the name is dynamically generated. */static const char *cfi_reg_name(unsigned int reg){ static char rname_buffer[CFI_REG_NAME_MAXLEN]; const char *rname;
switch (reg) { case CFI_UNDEFINED: return "<undefined>"; case CFI_CFA: return "cfa"; case CFI_SP_INDIRECT: return "(sp)"; case CFI_BP_INDIRECT: return "(bp)"; }
if (reg < CFI_NUM_REGS) { rname = arch_reg_name[reg]; if (rname) return rname; }
if (snprintf(rname_buffer, CFI_REG_NAME_MAXLEN, "r%d", reg) == -1) return "<error>";
return (const char *)rname_buffer;}
/* * Functions and macros to trace CFI registers changes. */
static void trace_cfi_reg(const char *prefix, int reg, const char *fmt, int base_prev, int offset_prev, int base_next, int offset_next){ char *rname;
if (base_prev == base_next && offset_prev == offset_next) return;
if (prefix) TRACE("%s:", prefix);
if (base_next == CFI_UNDEFINED) { TRACE("%1$s=<undef> ", cfi_reg_name(reg)); } else { rname = strdup(cfi_reg_name(reg)); TRACE(fmt, rname, cfi_reg_name(base_next), offset_next); free(rname); }}
static void trace_cfi_reg_val(const char *prefix, int reg, int base_prev, int offset_prev, int base_next, int offset_next){ trace_cfi_reg(prefix, reg, "%1$s=%2$s%3$+d ", base_prev, offset_prev, base_next, offset_next);}
static void trace_cfi_reg_ref(const char *prefix, int reg, int base_prev, int offset_prev, int base_next, int offset_next){ trace_cfi_reg(prefix, reg, "%1$s=(%2$s%3$+d) ", base_prev, offset_prev, base_next, offset_next);}
#define TRACE_CFI_REG_VAL(reg, prev, next) \ trace_cfi_reg_val(NULL, reg, prev.base, prev.offset, \ next.base, next.offset)
#define TRACE_CFI_REG_REF(reg, prev, next) \ trace_cfi_reg_ref(NULL, reg, prev.base, prev.offset, \ next.base, next.offset)
void trace_insn_state(struct instruction *insn, struct insn_state *sprev, struct insn_state *snext){ struct cfi_state *cprev, *cnext; int i;
if (!memcmp(sprev, snext, sizeof(struct insn_state))) return;
cprev = &sprev->cfi; cnext = &snext->cfi;
disas_print_insn(stderr, objtool_disas_ctx, insn, trace_depth - 1, "state: ");
/* print registers changes */ TRACE_CFI_REG_VAL(CFI_CFA, cprev->cfa, cnext->cfa); for (i = 0; i < CFI_NUM_REGS; i++) { TRACE_CFI_REG_VAL(i, cprev->vals[i], cnext->vals[i]); TRACE_CFI_REG_REF(i, cprev->regs[i], cnext->regs[i]); }
/* print attributes changes */ TRACE_CFI_ATTR_NUM(stack_size, cprev, cnext, "%d"); TRACE_CFI_ATTR_BOOL(drap, cprev, cnext); if (cnext->drap) { trace_cfi_reg_val("drap", cnext->drap_reg, cprev->drap_reg, cprev->drap_offset, cnext->drap_reg, cnext->drap_offset); } TRACE_CFI_ATTR_BOOL(bp_scratch, cprev, cnext); TRACE_CFI_ATTR_NUM(instr, sprev, snext, "%d"); TRACE_CFI_ATTR_NUM(uaccess_stack, sprev, snext, "%u");
TRACE("\n");
insn->trace = 1;}
void trace_alt_begin(struct instruction *orig_insn, struct alternative *alt, char *alt_name){ struct instruction *alt_insn; char suffix[2];
alt_insn = alt->insn;
if (alt->type == ALT_TYPE_EX_TABLE) { /* * When there is an exception table then the instruction * at the original location is executed but it can cause * an exception. In that case, the execution will be * redirected to the alternative instruction. * * The instruction at the original location can have * instruction alternatives, so we just print the location * of the instruction that can cause the exception and * not the instruction itself. */ TRACE_ALT_INFO_NOADDR(orig_insn, "/ ", "%s for instruction at 0x%lx <%s+0x%lx>", alt_name, orig_insn->offset, insn_sym(orig_insn)->name, orig_insn->offset - insn_sym(orig_insn)->offset); } else { TRACE_ALT_INFO_NOADDR(orig_insn, "/ ", "%s", alt_name); }
if (alt->type == ALT_TYPE_JUMP_TABLE) { /* * For a jump alternative, if the default instruction is * a NOP then it is replaced with the jmp instruction, * otherwise it is replaced with a NOP instruction. */ trace_depth++; if (orig_insn->type == INSN_NOP) { suffix[0] = (orig_insn->len == 5) ? 'q' : '\0'; TRACE_ADDR(orig_insn, "jmp%-3s %lx <%s+0x%lx>", suffix, alt_insn->offset, insn_sym(alt_insn)->name, alt_insn->offset - insn_sym(alt_insn)->offset); } else { TRACE_ADDR(orig_insn, "nop%d", orig_insn->len); trace_depth--; } }}
void trace_alt_end(struct instruction *orig_insn, struct alternative *alt, char *alt_name){ if (alt->type == ALT_TYPE_JUMP_TABLE && orig_insn->type == INSN_NOP) trace_depth--; TRACE_ALT_INFO_NOADDR(orig_insn, "\\ ", "%s", alt_name);}