57 lines
1 KiB
C
57 lines
1 KiB
C
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <mach.h>
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/*
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* XXX could remove the rock by hiding it in a special regs.
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* That would still be sleazy but would be thread-safe.
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*/
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static struct {
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int found;
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int nframe;
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Loc l;
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char *fn;
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char *var;
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} rock;
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static int
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ltrace(Map *map, Regs *regs, ulong pc, ulong nextpc, Symbol *sym, int depth)
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{
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ulong v;
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Symbol s1;
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USED(pc);
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USED(nextpc);
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USED(depth);
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if(sym==nil || strcmp(sym->name, rock.fn) != 0)
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return ++rock.nframe < 40;
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if(lookuplsym(sym, rock.var, &s1) < 0)
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return 0;
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if(locsimplify(map, regs, s1.loc, &rock.l) < 0)
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return 0;
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if(rock.l.type == LREG && rget(regs, rock.l.reg, &v) >= 0)
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rock.l = locconst(v);
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if(rock.l.type != LADDR && rock.l.type != LCONST)
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return 0;
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rock.found = 1;
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return 0;
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}
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int
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localaddr(Map *map, Regs *regs, char *fn, char *var, ulong *val)
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{
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rock.found = 0;
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rock.nframe = 0;
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rock.fn = fn;
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rock.var = var;
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stacktrace(map, regs, ltrace);
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if(rock.found){
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*val = rock.l.addr;
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return 0;
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}
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return -1;
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}
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