1 /* 2 * thumb definition 3 */ 4 #include <lib9.h> 5 #include <bio.h> 6 #include "uregt.h" 7 #include "mach.h" 8 9 10 #define REGOFF(x) (ulong) (&((struct Ureg *) 0)->x) 11 12 #define SP REGOFF(r13) 13 #define PC REGOFF(pc) 14 15 #define REGSIZE sizeof(struct Ureg) 16 17 Reglist thumbreglist[] = 18 { 19 {"LINK", REGOFF(link), RINT|RRDONLY, 'X'}, 20 {"TYPE", REGOFF(type), RINT|RRDONLY, 'X'}, 21 {"PSR", REGOFF(psr), RINT|RRDONLY, 'X'}, 22 {"PC", PC, RINT, 'X'}, 23 {"SP", SP, RINT, 'X'}, 24 {"R15", PC, RINT, 'X'}, 25 {"R14", REGOFF(r14), RINT, 'X'}, 26 {"R13", REGOFF(r13), RINT, 'X'}, 27 {"R12", REGOFF(r12), RINT, 'X'}, 28 {"R11", REGOFF(r11), RINT, 'X'}, 29 {"R10", REGOFF(r10), RINT, 'X'}, 30 {"R9", REGOFF(r9), RINT, 'X'}, 31 {"R8", REGOFF(r8), RINT, 'X'}, 32 {"R7", REGOFF(r7), RINT, 'X'}, 33 {"R6", REGOFF(r6), RINT, 'X'}, 34 {"R5", REGOFF(r5), RINT, 'X'}, 35 {"R4", REGOFF(r4), RINT, 'X'}, 36 {"R3", REGOFF(r3), RINT, 'X'}, 37 {"R2", REGOFF(r2), RINT, 'X'}, 38 {"R1", REGOFF(r1), RINT, 'X'}, 39 {"R0", REGOFF(r0), RINT, 'X'}, 40 { 0 } 41 }; 42 43 /* the machine description */ 44 Mach mthumb = 45 { 46 "thumb", 47 MARM, /*MTHUMB,*/ /* machine type */ 48 thumbreglist, /* register set */ 49 REGSIZE, /* register set size */ 50 0, /* fp register set size */ 51 "PC", /* name of PC */ 52 "SP", /* name of SP */ 53 "R15", /* name of link register */ 54 "setR12", /* static base register name */ 55 0, /* static base register value */ 56 0x1000, /* page size */ 57 0x80000000, /* kernel base */ 58 0, /* kernel text mask */ 59 0x7FFFFFFF, /* stack top */ 60 2, /* quantization of pc */ 61 4, /* szaddr */ 62 4, /* szreg */ 63 4, /* szfloat */ 64 8, /* szdouble */ 65 }; 66 67 typedef struct pcentry pcentry; 68 69 struct pcentry{ 70 long start; 71 long stop; 72 }; 73 74 static pcentry *pctab; 75 static int npctab; 76 77 void 78 thumbpctab(Biobuf *b, Fhdr *fp) 79 { 80 int n, o, ta; 81 uchar c[8]; 82 pcentry *tab; 83 84 Bseek(b, fp->lnpcoff+fp->lnpcsz, 0); 85 o = (int)Boffset(b); 86 Bseek(b, 0, 2); 87 n = (int)Boffset(b)-o; 88 pctab = (pcentry*)malloc(n); 89 if(pctab == 0) 90 return; 91 ta = fp->txtaddr; 92 tab = pctab; 93 Bseek(b, fp->lnpcoff+fp->lnpcsz, 0); 94 while(Bread(b, c, sizeof(c)) == sizeof(c)){ 95 tab->start = ta + (c[0]<<24)|(c[1]<<16)|(c[2]<<8)|c[3]; 96 tab->stop = ta + (c[4]<<24)|(c[5]<<16)|(c[6]<<8)|c[7]; 97 tab++; 98 } 99 npctab = n/sizeof(c); 100 } 101 102 int 103 thumbpclookup(uvlong pc) 104 { 105 uvlong l, u, m; 106 pcentry *tab = pctab; 107 108 l = 0; 109 u = npctab-1; 110 while(l < u){ 111 m = (l+u)/2; 112 if(pc < tab[m].start) 113 u = m-1; 114 else if(pc > tab[m].stop) 115 l = m+1; 116 else 117 l = u = m; 118 } 119 if(l == u && u < npctab && tab[u].start <= pc && pc <= tab[u].stop) 120 return 1; // thumb 121 return 0; // arm 122 } 123