diff options
Diffstat (limited to 'arch/ia64/kernel/unwind_decoder.c')
-rw-r--r-- | arch/ia64/kernel/unwind_decoder.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/arch/ia64/kernel/unwind_decoder.c b/arch/ia64/kernel/unwind_decoder.c new file mode 100644 index 0000000..50ac2d8 --- /dev/null +++ b/arch/ia64/kernel/unwind_decoder.c @@ -0,0 +1,459 @@ +/* + * Copyright (C) 2000 Hewlett-Packard Co + * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> + * + * Generic IA-64 unwind info decoder. + * + * This file is used both by the Linux kernel and objdump. Please keep + * the two copies of this file in sync. + * + * You need to customize the decoder by defining the following + * macros/constants before including this file: + * + * Types: + * unw_word Unsigned integer type with at least 64 bits + * + * Register names: + * UNW_REG_BSP + * UNW_REG_BSPSTORE + * UNW_REG_FPSR + * UNW_REG_LC + * UNW_REG_PFS + * UNW_REG_PR + * UNW_REG_RNAT + * UNW_REG_PSP + * UNW_REG_RP + * UNW_REG_UNAT + * + * Decoder action macros: + * UNW_DEC_BAD_CODE(code) + * UNW_DEC_ABI(fmt,abi,context,arg) + * UNW_DEC_BR_GR(fmt,brmask,gr,arg) + * UNW_DEC_BR_MEM(fmt,brmask,arg) + * UNW_DEC_COPY_STATE(fmt,label,arg) + * UNW_DEC_EPILOGUE(fmt,t,ecount,arg) + * UNW_DEC_FRGR_MEM(fmt,grmask,frmask,arg) + * UNW_DEC_FR_MEM(fmt,frmask,arg) + * UNW_DEC_GR_GR(fmt,grmask,gr,arg) + * UNW_DEC_GR_MEM(fmt,grmask,arg) + * UNW_DEC_LABEL_STATE(fmt,label,arg) + * UNW_DEC_MEM_STACK_F(fmt,t,size,arg) + * UNW_DEC_MEM_STACK_V(fmt,t,arg) + * UNW_DEC_PRIUNAT_GR(fmt,r,arg) + * UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg) + * UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg) + * UNW_DEC_PRIUNAT_WHEN_PSPREL(fmt,pspoff,arg) + * UNW_DEC_PRIUNAT_WHEN_SPREL(fmt,spoff,arg) + * UNW_DEC_PROLOGUE(fmt,body,rlen,arg) + * UNW_DEC_PROLOGUE_GR(fmt,rlen,mask,grsave,arg) + * UNW_DEC_REG_PSPREL(fmt,reg,pspoff,arg) + * UNW_DEC_REG_REG(fmt,src,dst,arg) + * UNW_DEC_REG_SPREL(fmt,reg,spoff,arg) + * UNW_DEC_REG_WHEN(fmt,reg,t,arg) + * UNW_DEC_RESTORE(fmt,t,abreg,arg) + * UNW_DEC_RESTORE_P(fmt,qp,t,abreg,arg) + * UNW_DEC_SPILL_BASE(fmt,pspoff,arg) + * UNW_DEC_SPILL_MASK(fmt,imaskp,arg) + * UNW_DEC_SPILL_PSPREL(fmt,t,abreg,pspoff,arg) + * UNW_DEC_SPILL_PSPREL_P(fmt,qp,t,abreg,pspoff,arg) + * UNW_DEC_SPILL_REG(fmt,t,abreg,x,ytreg,arg) + * UNW_DEC_SPILL_REG_P(fmt,qp,t,abreg,x,ytreg,arg) + * UNW_DEC_SPILL_SPREL(fmt,t,abreg,spoff,arg) + * UNW_DEC_SPILL_SPREL_P(fmt,qp,t,abreg,pspoff,arg) + */ + +static unw_word +unw_decode_uleb128 (unsigned char **dpp) +{ + unsigned shift = 0; + unw_word byte, result = 0; + unsigned char *bp = *dpp; + + while (1) + { + byte = *bp++; + result |= (byte & 0x7f) << shift; + if ((byte & 0x80) == 0) + break; + shift += 7; + } + *dpp = bp; + return result; +} + +static unsigned char * +unw_decode_x1 (unsigned char *dp, unsigned char code, void *arg) +{ + unsigned char byte1, abreg; + unw_word t, off; + + byte1 = *dp++; + t = unw_decode_uleb128 (&dp); + off = unw_decode_uleb128 (&dp); + abreg = (byte1 & 0x7f); + if (byte1 & 0x80) + UNW_DEC_SPILL_SPREL(X1, t, abreg, off, arg); + else + UNW_DEC_SPILL_PSPREL(X1, t, abreg, off, arg); + return dp; +} + +static unsigned char * +unw_decode_x2 (unsigned char *dp, unsigned char code, void *arg) +{ + unsigned char byte1, byte2, abreg, x, ytreg; + unw_word t; + + byte1 = *dp++; byte2 = *dp++; + t = unw_decode_uleb128 (&dp); + abreg = (byte1 & 0x7f); + ytreg = byte2; + x = (byte1 >> 7) & 1; + if ((byte1 & 0x80) == 0 && ytreg == 0) + UNW_DEC_RESTORE(X2, t, abreg, arg); + else + UNW_DEC_SPILL_REG(X2, t, abreg, x, ytreg, arg); + return dp; +} + +static unsigned char * +unw_decode_x3 (unsigned char *dp, unsigned char code, void *arg) +{ + unsigned char byte1, byte2, abreg, qp; + unw_word t, off; + + byte1 = *dp++; byte2 = *dp++; + t = unw_decode_uleb128 (&dp); + off = unw_decode_uleb128 (&dp); + + qp = (byte1 & 0x3f); + abreg = (byte2 & 0x7f); + + if (byte1 & 0x80) + UNW_DEC_SPILL_SPREL_P(X3, qp, t, abreg, off, arg); + else + UNW_DEC_SPILL_PSPREL_P(X3, qp, t, abreg, off, arg); + return dp; +} + +static unsigned char * +unw_decode_x4 (unsigned char *dp, unsigned char code, void *arg) +{ + unsigned char byte1, byte2, byte3, qp, abreg, x, ytreg; + unw_word t; + + byte1 = *dp++; byte2 = *dp++; byte3 = *dp++; + t = unw_decode_uleb128 (&dp); + + qp = (byte1 & 0x3f); + abreg = (byte2 & 0x7f); + x = (byte2 >> 7) & 1; + ytreg = byte3; + + if ((byte2 & 0x80) == 0 && byte3 == 0) + UNW_DEC_RESTORE_P(X4, qp, t, abreg, arg); + else + UNW_DEC_SPILL_REG_P(X4, qp, t, abreg, x, ytreg, arg); + return dp; +} + +static unsigned char * +unw_decode_r1 (unsigned char *dp, unsigned char code, void *arg) +{ + int body = (code & 0x20) != 0; + unw_word rlen; + + rlen = (code & 0x1f); + UNW_DEC_PROLOGUE(R1, body, rlen, arg); + return dp; +} + +static unsigned char * +unw_decode_r2 (unsigned char *dp, unsigned char code, void *arg) +{ + unsigned char byte1, mask, grsave; + unw_word rlen; + + byte1 = *dp++; + + mask = ((code & 0x7) << 1) | ((byte1 >> 7) & 1); + grsave = (byte1 & 0x7f); + rlen = unw_decode_uleb128 (&dp); + UNW_DEC_PROLOGUE_GR(R2, rlen, mask, grsave, arg); + return dp; +} + +static unsigned char * +unw_decode_r3 (unsigned char *dp, unsigned char code, void *arg) +{ + unw_word rlen; + + rlen = unw_decode_uleb128 (&dp); + UNW_DEC_PROLOGUE(R3, ((code & 0x3) == 1), rlen, arg); + return dp; +} + +static unsigned char * +unw_decode_p1 (unsigned char *dp, unsigned char code, void *arg) +{ + unsigned char brmask = (code & 0x1f); + + UNW_DEC_BR_MEM(P1, brmask, arg); + return dp; +} + +static unsigned char * +unw_decode_p2_p5 (unsigned char *dp, unsigned char code, void *arg) +{ + if ((code & 0x10) == 0) + { + unsigned char byte1 = *dp++; + + UNW_DEC_BR_GR(P2, ((code & 0xf) << 1) | ((byte1 >> 7) & 1), + (byte1 & 0x7f), arg); + } + else if ((code & 0x08) == 0) + { + unsigned char byte1 = *dp++, r, dst; + + r = ((code & 0x7) << 1) | ((byte1 >> 7) & 1); + dst = (byte1 & 0x7f); + switch (r) + { + case 0: UNW_DEC_REG_GR(P3, UNW_REG_PSP, dst, arg); break; + case 1: UNW_DEC_REG_GR(P3, UNW_REG_RP, dst, arg); break; + case 2: UNW_DEC_REG_GR(P3, UNW_REG_PFS, dst, arg); break; + case 3: UNW_DEC_REG_GR(P3, UNW_REG_PR, dst, arg); break; + case 4: UNW_DEC_REG_GR(P3, UNW_REG_UNAT, dst, arg); break; + case 5: UNW_DEC_REG_GR(P3, UNW_REG_LC, dst, arg); break; + case 6: UNW_DEC_RP_BR(P3, dst, arg); break; + case 7: UNW_DEC_REG_GR(P3, UNW_REG_RNAT, dst, arg); break; + case 8: UNW_DEC_REG_GR(P3, UNW_REG_BSP, dst, arg); break; + case 9: UNW_DEC_REG_GR(P3, UNW_REG_BSPSTORE, dst, arg); break; + case 10: UNW_DEC_REG_GR(P3, UNW_REG_FPSR, dst, arg); break; + case 11: UNW_DEC_PRIUNAT_GR(P3, dst, arg); break; + default: UNW_DEC_BAD_CODE(r); break; + } + } + else if ((code & 0x7) == 0) + UNW_DEC_SPILL_MASK(P4, dp, arg); + else if ((code & 0x7) == 1) + { + unw_word grmask, frmask, byte1, byte2, byte3; + + byte1 = *dp++; byte2 = *dp++; byte3 = *dp++; + grmask = ((byte1 >> 4) & 0xf); + frmask = ((byte1 & 0xf) << 16) | (byte2 << 8) | byte3; + UNW_DEC_FRGR_MEM(P5, grmask, frmask, arg); + } + else + UNW_DEC_BAD_CODE(code); + return dp; +} + +static unsigned char * +unw_decode_p6 (unsigned char *dp, unsigned char code, void *arg) +{ + int gregs = (code & 0x10) != 0; + unsigned char mask = (code & 0x0f); + + if (gregs) + UNW_DEC_GR_MEM(P6, mask, arg); + else + UNW_DEC_FR_MEM(P6, mask, arg); + return dp; +} + +static unsigned char * +unw_decode_p7_p10 (unsigned char *dp, unsigned char code, void *arg) +{ + unsigned char r, byte1, byte2; + unw_word t, size; + + if ((code & 0x10) == 0) + { + r = (code & 0xf); + t = unw_decode_uleb128 (&dp); + switch (r) + { + case 0: + size = unw_decode_uleb128 (&dp); + UNW_DEC_MEM_STACK_F(P7, t, size, arg); + break; + + case 1: UNW_DEC_MEM_STACK_V(P7, t, arg); break; + case 2: UNW_DEC_SPILL_BASE(P7, t, arg); break; + case 3: UNW_DEC_REG_SPREL(P7, UNW_REG_PSP, t, arg); break; + case 4: UNW_DEC_REG_WHEN(P7, UNW_REG_RP, t, arg); break; + case 5: UNW_DEC_REG_PSPREL(P7, UNW_REG_RP, t, arg); break; + case 6: UNW_DEC_REG_WHEN(P7, UNW_REG_PFS, t, arg); break; + case 7: UNW_DEC_REG_PSPREL(P7, UNW_REG_PFS, t, arg); break; + case 8: UNW_DEC_REG_WHEN(P7, UNW_REG_PR, t, arg); break; + case 9: UNW_DEC_REG_PSPREL(P7, UNW_REG_PR, t, arg); break; + case 10: UNW_DEC_REG_WHEN(P7, UNW_REG_LC, t, arg); break; + case 11: UNW_DEC_REG_PSPREL(P7, UNW_REG_LC, t, arg); break; + case 12: UNW_DEC_REG_WHEN(P7, UNW_REG_UNAT, t, arg); break; + case 13: UNW_DEC_REG_PSPREL(P7, UNW_REG_UNAT, t, arg); break; + case 14: UNW_DEC_REG_WHEN(P7, UNW_REG_FPSR, t, arg); break; + case 15: UNW_DEC_REG_PSPREL(P7, UNW_REG_FPSR, t, arg); break; + default: UNW_DEC_BAD_CODE(r); break; + } + } + else + { + switch (code & 0xf) + { + case 0x0: /* p8 */ + { + r = *dp++; + t = unw_decode_uleb128 (&dp); + switch (r) + { + case 1: UNW_DEC_REG_SPREL(P8, UNW_REG_RP, t, arg); break; + case 2: UNW_DEC_REG_SPREL(P8, UNW_REG_PFS, t, arg); break; + case 3: UNW_DEC_REG_SPREL(P8, UNW_REG_PR, t, arg); break; + case 4: UNW_DEC_REG_SPREL(P8, UNW_REG_LC, t, arg); break; + case 5: UNW_DEC_REG_SPREL(P8, UNW_REG_UNAT, t, arg); break; + case 6: UNW_DEC_REG_SPREL(P8, UNW_REG_FPSR, t, arg); break; + case 7: UNW_DEC_REG_WHEN(P8, UNW_REG_BSP, t, arg); break; + case 8: UNW_DEC_REG_PSPREL(P8, UNW_REG_BSP, t, arg); break; + case 9: UNW_DEC_REG_SPREL(P8, UNW_REG_BSP, t, arg); break; + case 10: UNW_DEC_REG_WHEN(P8, UNW_REG_BSPSTORE, t, arg); break; + case 11: UNW_DEC_REG_PSPREL(P8, UNW_REG_BSPSTORE, t, arg); break; + case 12: UNW_DEC_REG_SPREL(P8, UNW_REG_BSPSTORE, t, arg); break; + case 13: UNW_DEC_REG_WHEN(P8, UNW_REG_RNAT, t, arg); break; + case 14: UNW_DEC_REG_PSPREL(P8, UNW_REG_RNAT, t, arg); break; + case 15: UNW_DEC_REG_SPREL(P8, UNW_REG_RNAT, t, arg); break; + case 16: UNW_DEC_PRIUNAT_WHEN_GR(P8, t, arg); break; + case 17: UNW_DEC_PRIUNAT_PSPREL(P8, t, arg); break; + case 18: UNW_DEC_PRIUNAT_SPREL(P8, t, arg); break; + case 19: UNW_DEC_PRIUNAT_WHEN_MEM(P8, t, arg); break; + default: UNW_DEC_BAD_CODE(r); break; + } + } + break; + + case 0x1: + byte1 = *dp++; byte2 = *dp++; + UNW_DEC_GR_GR(P9, (byte1 & 0xf), (byte2 & 0x7f), arg); + break; + + case 0xf: /* p10 */ + byte1 = *dp++; byte2 = *dp++; + UNW_DEC_ABI(P10, byte1, byte2, arg); + break; + + case 0x9: + return unw_decode_x1 (dp, code, arg); + + case 0xa: + return unw_decode_x2 (dp, code, arg); + + case 0xb: + return unw_decode_x3 (dp, code, arg); + + case 0xc: + return unw_decode_x4 (dp, code, arg); + + default: + UNW_DEC_BAD_CODE(code); + break; + } + } + return dp; +} + +static unsigned char * +unw_decode_b1 (unsigned char *dp, unsigned char code, void *arg) +{ + unw_word label = (code & 0x1f); + + if ((code & 0x20) != 0) + UNW_DEC_COPY_STATE(B1, label, arg); + else + UNW_DEC_LABEL_STATE(B1, label, arg); + return dp; +} + +static unsigned char * +unw_decode_b2 (unsigned char *dp, unsigned char code, void *arg) +{ + unw_word t; + + t = unw_decode_uleb128 (&dp); + UNW_DEC_EPILOGUE(B2, t, (code & 0x1f), arg); + return dp; +} + +static unsigned char * +unw_decode_b3_x4 (unsigned char *dp, unsigned char code, void *arg) +{ + unw_word t, ecount, label; + + if ((code & 0x10) == 0) + { + t = unw_decode_uleb128 (&dp); + ecount = unw_decode_uleb128 (&dp); + UNW_DEC_EPILOGUE(B3, t, ecount, arg); + } + else if ((code & 0x07) == 0) + { + label = unw_decode_uleb128 (&dp); + if ((code & 0x08) != 0) + UNW_DEC_COPY_STATE(B4, label, arg); + else + UNW_DEC_LABEL_STATE(B4, label, arg); + } + else + switch (code & 0x7) + { + case 1: return unw_decode_x1 (dp, code, arg); + case 2: return unw_decode_x2 (dp, code, arg); + case 3: return unw_decode_x3 (dp, code, arg); + case 4: return unw_decode_x4 (dp, code, arg); + default: UNW_DEC_BAD_CODE(code); break; + } + return dp; +} + +typedef unsigned char *(*unw_decoder) (unsigned char *, unsigned char, void *); + +static unw_decoder unw_decode_table[2][8] = +{ + /* prologue table: */ + { + unw_decode_r1, /* 0 */ + unw_decode_r1, + unw_decode_r2, + unw_decode_r3, + unw_decode_p1, /* 4 */ + unw_decode_p2_p5, + unw_decode_p6, + unw_decode_p7_p10 + }, + { + unw_decode_r1, /* 0 */ + unw_decode_r1, + unw_decode_r2, + unw_decode_r3, + unw_decode_b1, /* 4 */ + unw_decode_b1, + unw_decode_b2, + unw_decode_b3_x4 + } +}; + +/* + * Decode one descriptor and return address of next descriptor. + */ +static inline unsigned char * +unw_decode (unsigned char *dp, int inside_body, void *arg) +{ + unw_decoder decoder; + unsigned char code; + + code = *dp++; + decoder = unw_decode_table[inside_body][code >> 5]; + dp = (*decoder) (dp, code, arg); + return dp; +} |