461 lines
12 KiB
C
461 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2000 Hewlett-Packard Co
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* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* Generic IA-64 unwind info decoder.
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*
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* This file is used both by the Linux kernel and objdump. Please keep
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* the two copies of this file in sync.
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*
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* You need to customize the decoder by defining the following
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* macros/constants before including this file:
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*
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* Types:
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* unw_word Unsigned integer type with at least 64 bits
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*
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* Register names:
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* UNW_REG_BSP
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* UNW_REG_BSPSTORE
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* UNW_REG_FPSR
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* UNW_REG_LC
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* UNW_REG_PFS
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* UNW_REG_PR
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* UNW_REG_RNAT
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* UNW_REG_PSP
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* UNW_REG_RP
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* UNW_REG_UNAT
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*
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* Decoder action macros:
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* UNW_DEC_BAD_CODE(code)
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* UNW_DEC_ABI(fmt,abi,context,arg)
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* UNW_DEC_BR_GR(fmt,brmask,gr,arg)
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* UNW_DEC_BR_MEM(fmt,brmask,arg)
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* UNW_DEC_COPY_STATE(fmt,label,arg)
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* UNW_DEC_EPILOGUE(fmt,t,ecount,arg)
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* UNW_DEC_FRGR_MEM(fmt,grmask,frmask,arg)
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* UNW_DEC_FR_MEM(fmt,frmask,arg)
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* UNW_DEC_GR_GR(fmt,grmask,gr,arg)
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* UNW_DEC_GR_MEM(fmt,grmask,arg)
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* UNW_DEC_LABEL_STATE(fmt,label,arg)
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* UNW_DEC_MEM_STACK_F(fmt,t,size,arg)
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* UNW_DEC_MEM_STACK_V(fmt,t,arg)
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* UNW_DEC_PRIUNAT_GR(fmt,r,arg)
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* UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg)
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* UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg)
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* UNW_DEC_PRIUNAT_WHEN_PSPREL(fmt,pspoff,arg)
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* UNW_DEC_PRIUNAT_WHEN_SPREL(fmt,spoff,arg)
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* UNW_DEC_PROLOGUE(fmt,body,rlen,arg)
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* UNW_DEC_PROLOGUE_GR(fmt,rlen,mask,grsave,arg)
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* UNW_DEC_REG_PSPREL(fmt,reg,pspoff,arg)
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* UNW_DEC_REG_REG(fmt,src,dst,arg)
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* UNW_DEC_REG_SPREL(fmt,reg,spoff,arg)
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* UNW_DEC_REG_WHEN(fmt,reg,t,arg)
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* UNW_DEC_RESTORE(fmt,t,abreg,arg)
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* UNW_DEC_RESTORE_P(fmt,qp,t,abreg,arg)
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* UNW_DEC_SPILL_BASE(fmt,pspoff,arg)
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* UNW_DEC_SPILL_MASK(fmt,imaskp,arg)
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* UNW_DEC_SPILL_PSPREL(fmt,t,abreg,pspoff,arg)
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* UNW_DEC_SPILL_PSPREL_P(fmt,qp,t,abreg,pspoff,arg)
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* UNW_DEC_SPILL_REG(fmt,t,abreg,x,ytreg,arg)
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* UNW_DEC_SPILL_REG_P(fmt,qp,t,abreg,x,ytreg,arg)
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* UNW_DEC_SPILL_SPREL(fmt,t,abreg,spoff,arg)
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* UNW_DEC_SPILL_SPREL_P(fmt,qp,t,abreg,pspoff,arg)
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*/
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static unw_word
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unw_decode_uleb128 (unsigned char **dpp)
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{
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unsigned shift = 0;
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unw_word byte, result = 0;
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unsigned char *bp = *dpp;
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while (1)
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{
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byte = *bp++;
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result |= (byte & 0x7f) << shift;
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if ((byte & 0x80) == 0)
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break;
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shift += 7;
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}
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*dpp = bp;
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return result;
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}
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static unsigned char *
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unw_decode_x1 (unsigned char *dp, unsigned char code, void *arg)
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{
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unsigned char byte1, abreg;
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unw_word t, off;
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byte1 = *dp++;
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t = unw_decode_uleb128 (&dp);
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off = unw_decode_uleb128 (&dp);
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abreg = (byte1 & 0x7f);
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if (byte1 & 0x80)
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UNW_DEC_SPILL_SPREL(X1, t, abreg, off, arg);
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else
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UNW_DEC_SPILL_PSPREL(X1, t, abreg, off, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_x2 (unsigned char *dp, unsigned char code, void *arg)
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{
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unsigned char byte1, byte2, abreg, x, ytreg;
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unw_word t;
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byte1 = *dp++; byte2 = *dp++;
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t = unw_decode_uleb128 (&dp);
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abreg = (byte1 & 0x7f);
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ytreg = byte2;
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x = (byte1 >> 7) & 1;
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if ((byte1 & 0x80) == 0 && ytreg == 0)
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UNW_DEC_RESTORE(X2, t, abreg, arg);
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else
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UNW_DEC_SPILL_REG(X2, t, abreg, x, ytreg, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_x3 (unsigned char *dp, unsigned char code, void *arg)
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{
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unsigned char byte1, byte2, abreg, qp;
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unw_word t, off;
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byte1 = *dp++; byte2 = *dp++;
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t = unw_decode_uleb128 (&dp);
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off = unw_decode_uleb128 (&dp);
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qp = (byte1 & 0x3f);
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abreg = (byte2 & 0x7f);
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if (byte1 & 0x80)
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UNW_DEC_SPILL_SPREL_P(X3, qp, t, abreg, off, arg);
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else
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UNW_DEC_SPILL_PSPREL_P(X3, qp, t, abreg, off, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_x4 (unsigned char *dp, unsigned char code, void *arg)
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{
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unsigned char byte1, byte2, byte3, qp, abreg, x, ytreg;
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unw_word t;
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byte1 = *dp++; byte2 = *dp++; byte3 = *dp++;
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t = unw_decode_uleb128 (&dp);
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qp = (byte1 & 0x3f);
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abreg = (byte2 & 0x7f);
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x = (byte2 >> 7) & 1;
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ytreg = byte3;
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if ((byte2 & 0x80) == 0 && byte3 == 0)
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UNW_DEC_RESTORE_P(X4, qp, t, abreg, arg);
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else
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UNW_DEC_SPILL_REG_P(X4, qp, t, abreg, x, ytreg, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_r1 (unsigned char *dp, unsigned char code, void *arg)
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{
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int body = (code & 0x20) != 0;
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unw_word rlen;
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rlen = (code & 0x1f);
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UNW_DEC_PROLOGUE(R1, body, rlen, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_r2 (unsigned char *dp, unsigned char code, void *arg)
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{
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unsigned char byte1, mask, grsave;
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unw_word rlen;
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byte1 = *dp++;
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mask = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
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grsave = (byte1 & 0x7f);
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rlen = unw_decode_uleb128 (&dp);
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UNW_DEC_PROLOGUE_GR(R2, rlen, mask, grsave, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_r3 (unsigned char *dp, unsigned char code, void *arg)
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{
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unw_word rlen;
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rlen = unw_decode_uleb128 (&dp);
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UNW_DEC_PROLOGUE(R3, ((code & 0x3) == 1), rlen, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_p1 (unsigned char *dp, unsigned char code, void *arg)
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{
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unsigned char brmask = (code & 0x1f);
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UNW_DEC_BR_MEM(P1, brmask, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_p2_p5 (unsigned char *dp, unsigned char code, void *arg)
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{
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if ((code & 0x10) == 0)
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{
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unsigned char byte1 = *dp++;
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UNW_DEC_BR_GR(P2, ((code & 0xf) << 1) | ((byte1 >> 7) & 1),
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(byte1 & 0x7f), arg);
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}
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else if ((code & 0x08) == 0)
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{
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unsigned char byte1 = *dp++, r, dst;
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r = ((code & 0x7) << 1) | ((byte1 >> 7) & 1);
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dst = (byte1 & 0x7f);
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switch (r)
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{
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case 0: UNW_DEC_REG_GR(P3, UNW_REG_PSP, dst, arg); break;
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case 1: UNW_DEC_REG_GR(P3, UNW_REG_RP, dst, arg); break;
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case 2: UNW_DEC_REG_GR(P3, UNW_REG_PFS, dst, arg); break;
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case 3: UNW_DEC_REG_GR(P3, UNW_REG_PR, dst, arg); break;
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case 4: UNW_DEC_REG_GR(P3, UNW_REG_UNAT, dst, arg); break;
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case 5: UNW_DEC_REG_GR(P3, UNW_REG_LC, dst, arg); break;
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case 6: UNW_DEC_RP_BR(P3, dst, arg); break;
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case 7: UNW_DEC_REG_GR(P3, UNW_REG_RNAT, dst, arg); break;
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case 8: UNW_DEC_REG_GR(P3, UNW_REG_BSP, dst, arg); break;
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case 9: UNW_DEC_REG_GR(P3, UNW_REG_BSPSTORE, dst, arg); break;
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case 10: UNW_DEC_REG_GR(P3, UNW_REG_FPSR, dst, arg); break;
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case 11: UNW_DEC_PRIUNAT_GR(P3, dst, arg); break;
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default: UNW_DEC_BAD_CODE(r); break;
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}
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}
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else if ((code & 0x7) == 0)
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UNW_DEC_SPILL_MASK(P4, dp, arg);
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else if ((code & 0x7) == 1)
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{
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unw_word grmask, frmask, byte1, byte2, byte3;
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byte1 = *dp++; byte2 = *dp++; byte3 = *dp++;
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grmask = ((byte1 >> 4) & 0xf);
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frmask = ((byte1 & 0xf) << 16) | (byte2 << 8) | byte3;
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UNW_DEC_FRGR_MEM(P5, grmask, frmask, arg);
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}
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else
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UNW_DEC_BAD_CODE(code);
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return dp;
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}
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static unsigned char *
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unw_decode_p6 (unsigned char *dp, unsigned char code, void *arg)
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{
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int gregs = (code & 0x10) != 0;
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unsigned char mask = (code & 0x0f);
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if (gregs)
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UNW_DEC_GR_MEM(P6, mask, arg);
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else
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UNW_DEC_FR_MEM(P6, mask, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_p7_p10 (unsigned char *dp, unsigned char code, void *arg)
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{
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unsigned char r, byte1, byte2;
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unw_word t, size;
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if ((code & 0x10) == 0)
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{
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r = (code & 0xf);
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t = unw_decode_uleb128 (&dp);
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switch (r)
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{
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case 0:
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size = unw_decode_uleb128 (&dp);
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UNW_DEC_MEM_STACK_F(P7, t, size, arg);
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break;
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case 1: UNW_DEC_MEM_STACK_V(P7, t, arg); break;
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case 2: UNW_DEC_SPILL_BASE(P7, t, arg); break;
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case 3: UNW_DEC_REG_SPREL(P7, UNW_REG_PSP, t, arg); break;
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case 4: UNW_DEC_REG_WHEN(P7, UNW_REG_RP, t, arg); break;
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case 5: UNW_DEC_REG_PSPREL(P7, UNW_REG_RP, t, arg); break;
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case 6: UNW_DEC_REG_WHEN(P7, UNW_REG_PFS, t, arg); break;
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case 7: UNW_DEC_REG_PSPREL(P7, UNW_REG_PFS, t, arg); break;
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case 8: UNW_DEC_REG_WHEN(P7, UNW_REG_PR, t, arg); break;
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case 9: UNW_DEC_REG_PSPREL(P7, UNW_REG_PR, t, arg); break;
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case 10: UNW_DEC_REG_WHEN(P7, UNW_REG_LC, t, arg); break;
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case 11: UNW_DEC_REG_PSPREL(P7, UNW_REG_LC, t, arg); break;
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case 12: UNW_DEC_REG_WHEN(P7, UNW_REG_UNAT, t, arg); break;
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case 13: UNW_DEC_REG_PSPREL(P7, UNW_REG_UNAT, t, arg); break;
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case 14: UNW_DEC_REG_WHEN(P7, UNW_REG_FPSR, t, arg); break;
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case 15: UNW_DEC_REG_PSPREL(P7, UNW_REG_FPSR, t, arg); break;
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default: UNW_DEC_BAD_CODE(r); break;
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}
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}
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else
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{
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switch (code & 0xf)
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{
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case 0x0: /* p8 */
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{
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r = *dp++;
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t = unw_decode_uleb128 (&dp);
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switch (r)
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{
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case 1: UNW_DEC_REG_SPREL(P8, UNW_REG_RP, t, arg); break;
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case 2: UNW_DEC_REG_SPREL(P8, UNW_REG_PFS, t, arg); break;
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case 3: UNW_DEC_REG_SPREL(P8, UNW_REG_PR, t, arg); break;
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case 4: UNW_DEC_REG_SPREL(P8, UNW_REG_LC, t, arg); break;
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case 5: UNW_DEC_REG_SPREL(P8, UNW_REG_UNAT, t, arg); break;
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case 6: UNW_DEC_REG_SPREL(P8, UNW_REG_FPSR, t, arg); break;
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case 7: UNW_DEC_REG_WHEN(P8, UNW_REG_BSP, t, arg); break;
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case 8: UNW_DEC_REG_PSPREL(P8, UNW_REG_BSP, t, arg); break;
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case 9: UNW_DEC_REG_SPREL(P8, UNW_REG_BSP, t, arg); break;
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case 10: UNW_DEC_REG_WHEN(P8, UNW_REG_BSPSTORE, t, arg); break;
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case 11: UNW_DEC_REG_PSPREL(P8, UNW_REG_BSPSTORE, t, arg); break;
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case 12: UNW_DEC_REG_SPREL(P8, UNW_REG_BSPSTORE, t, arg); break;
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case 13: UNW_DEC_REG_WHEN(P8, UNW_REG_RNAT, t, arg); break;
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case 14: UNW_DEC_REG_PSPREL(P8, UNW_REG_RNAT, t, arg); break;
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case 15: UNW_DEC_REG_SPREL(P8, UNW_REG_RNAT, t, arg); break;
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case 16: UNW_DEC_PRIUNAT_WHEN_GR(P8, t, arg); break;
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case 17: UNW_DEC_PRIUNAT_PSPREL(P8, t, arg); break;
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case 18: UNW_DEC_PRIUNAT_SPREL(P8, t, arg); break;
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case 19: UNW_DEC_PRIUNAT_WHEN_MEM(P8, t, arg); break;
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default: UNW_DEC_BAD_CODE(r); break;
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}
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}
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break;
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case 0x1:
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byte1 = *dp++; byte2 = *dp++;
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UNW_DEC_GR_GR(P9, (byte1 & 0xf), (byte2 & 0x7f), arg);
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break;
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case 0xf: /* p10 */
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byte1 = *dp++; byte2 = *dp++;
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UNW_DEC_ABI(P10, byte1, byte2, arg);
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break;
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case 0x9:
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return unw_decode_x1 (dp, code, arg);
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case 0xa:
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return unw_decode_x2 (dp, code, arg);
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case 0xb:
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return unw_decode_x3 (dp, code, arg);
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case 0xc:
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return unw_decode_x4 (dp, code, arg);
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default:
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UNW_DEC_BAD_CODE(code);
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break;
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}
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}
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return dp;
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}
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static unsigned char *
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unw_decode_b1 (unsigned char *dp, unsigned char code, void *arg)
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{
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unw_word label = (code & 0x1f);
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if ((code & 0x20) != 0)
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UNW_DEC_COPY_STATE(B1, label, arg);
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else
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UNW_DEC_LABEL_STATE(B1, label, arg);
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return dp;
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}
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static unsigned char *
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unw_decode_b2 (unsigned char *dp, unsigned char code, void *arg)
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{
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unw_word t;
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t = unw_decode_uleb128 (&dp);
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UNW_DEC_EPILOGUE(B2, t, (code & 0x1f), arg);
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return dp;
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}
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static unsigned char *
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unw_decode_b3_x4 (unsigned char *dp, unsigned char code, void *arg)
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{
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unw_word t, ecount, label;
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if ((code & 0x10) == 0)
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{
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t = unw_decode_uleb128 (&dp);
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ecount = unw_decode_uleb128 (&dp);
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UNW_DEC_EPILOGUE(B3, t, ecount, arg);
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}
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else if ((code & 0x07) == 0)
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{
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label = unw_decode_uleb128 (&dp);
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if ((code & 0x08) != 0)
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UNW_DEC_COPY_STATE(B4, label, arg);
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else
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UNW_DEC_LABEL_STATE(B4, label, arg);
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}
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else
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switch (code & 0x7)
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{
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case 1: return unw_decode_x1 (dp, code, arg);
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case 2: return unw_decode_x2 (dp, code, arg);
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case 3: return unw_decode_x3 (dp, code, arg);
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case 4: return unw_decode_x4 (dp, code, arg);
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default: UNW_DEC_BAD_CODE(code); break;
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}
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return dp;
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}
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typedef unsigned char *(*unw_decoder) (unsigned char *, unsigned char, void *);
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static unw_decoder unw_decode_table[2][8] =
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{
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/* prologue table: */
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{
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unw_decode_r1, /* 0 */
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unw_decode_r1,
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unw_decode_r2,
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unw_decode_r3,
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unw_decode_p1, /* 4 */
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unw_decode_p2_p5,
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unw_decode_p6,
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unw_decode_p7_p10
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},
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{
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unw_decode_r1, /* 0 */
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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;
|
|
}
|