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Improve self-relocation and fix ABI misinterpretation. The changes
here mostly mirror the changes made in boot/efi/libefi/arch/ia64/start.S rev 1.5 Significant difference: We don't handle the IPLT relocation here. For barebones KLD support, we make the fptr_storage global.
This commit is contained in:
Marcel Moolenaar
parent
77de753f65
commit
76a9e6c9f5
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=95191
@ -423,68 +423,69 @@ STATIC_ENTRY(_reloc, 1)
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;;
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cmp.eq p6,p0=R_IA64_NONE,r23
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(p6) br.cond.dpnt.few 3f
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;;
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cmp.eq p6,p0=R_IA64_DIR64LSB,r23
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;;
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(p6) br.cond.dptk.few 4f
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;;
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cmp.eq p6,p0=R_IA64_FPTR64LSB,r23
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;;
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(p6) br.cond.dptk.few 5f
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;;
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cmp.eq p6,p0=R_IA64_REL64LSB,r23
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;;
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(p6) br.cond.dptk.few 4f
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;;
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3: cmp.ltu p6,p0=0,r19 // more?
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(p6) br.cond.dptk.few 2b // loop
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mov r8=0 // success return value
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;;
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br.cond.sptk.few 9f // done
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4:
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ld8 r16=[r15] // read value
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;;
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add r16=r16,in0 // relocate it
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;;
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st8 [r15]=r16 // and store it back
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br.cond.sptk.few 3b
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5:
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extr.u r23=r16,32,32 // ELF64_R_SYM(r16)
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extr.u r16=r16,32,32 // ELF64_R_SYM(r16)
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;;
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setf.sig f10=r23 // so we can multiply
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setf.sig f10=r16 // so we can multiply
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;;
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xma.lu f10=f10,f9,f8 // f10=symtab + r_sym*syment
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;;
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getf.sig r16=f10
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;;
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;;
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add r16=8,r16 // address of st_value
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;;
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ld8 r16=[r16] // read symbol value
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;;
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add r16=r16,in0 // relocate symbol value
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;;
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cmp.eq p6,p0=R_IA64_DIR64LSB,r23
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(p6) br.cond.dptk.few 5f
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;;
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cmp.eq p6,p0=R_IA64_FPTR64LSB,r23
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(p6) br.cond.dptk.few 6f
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;;
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3:
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cmp.ltu p6,p0=0,r19 // more?
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(p6) br.cond.dptk.few 2b // loop
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mov r8=0 // success return value
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br.cond.sptk.few 9f // done
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4:
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add r16=in0,r17 // BD + A
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;;
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st8 [r15]=r16 // word64 (LSB)
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br.cond.sptk.few 3b
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5:
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add r16=r16,r17 // S + A
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;;
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st8 [r15]=r16 // word64 (LSB)
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br.cond.sptk.few 3b
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6:
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movl r17=@gprel(fptr_storage)
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;;
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add r17=r17,gp // start of fptrs
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;;
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6: cmp.geu p6,p0=r17,r2 // end of fptrs?
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(p6) br.cond.dpnt.few 7f // can't find existing fptr
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7: cmp.geu p6,p0=r17,r2 // end of fptrs?
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(p6) br.cond.dpnt.few 8f // can't find existing fptr
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ld8 r20=[r17] // read function from fptr
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;;
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cmp.eq p6,p0=r16,r20 // same function?
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;;
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;;
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(p6) st8 [r15]=r17 // reuse fptr
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(p6) br.cond.sptk.few 3b // done
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add r17=16,r17 // next fptr
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br.cond.sptk.few 6b
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7: // allocate new fptr
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br.cond.sptk.few 7b
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8: // allocate new fptr
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mov r8=1 // failure return value
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;;
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cmp.geu p6,p0=r2,r3 // space left?
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(p6) br.cond.dpnt.few 9f // bail out
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@ -501,10 +502,10 @@ STATIC_ENTRY(_reloc, 1)
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br.ret.sptk.few rp
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END(_reloc)
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.data
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.align 16
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fptr_storage:
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.global fptr_storage
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fptr_storage:
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.space 4096*16 // XXX
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fptr_storage_end:
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fptr_storage_end:
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@ -423,68 +423,69 @@ STATIC_ENTRY(_reloc, 1)
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;;
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cmp.eq p6,p0=R_IA64_NONE,r23
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(p6) br.cond.dpnt.few 3f
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;;
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cmp.eq p6,p0=R_IA64_DIR64LSB,r23
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;;
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(p6) br.cond.dptk.few 4f
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;;
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cmp.eq p6,p0=R_IA64_FPTR64LSB,r23
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;;
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(p6) br.cond.dptk.few 5f
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;;
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cmp.eq p6,p0=R_IA64_REL64LSB,r23
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;;
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(p6) br.cond.dptk.few 4f
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;;
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3: cmp.ltu p6,p0=0,r19 // more?
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(p6) br.cond.dptk.few 2b // loop
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mov r8=0 // success return value
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;;
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br.cond.sptk.few 9f // done
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4:
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ld8 r16=[r15] // read value
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;;
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add r16=r16,in0 // relocate it
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;;
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st8 [r15]=r16 // and store it back
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br.cond.sptk.few 3b
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5:
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extr.u r23=r16,32,32 // ELF64_R_SYM(r16)
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extr.u r16=r16,32,32 // ELF64_R_SYM(r16)
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;;
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setf.sig f10=r23 // so we can multiply
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setf.sig f10=r16 // so we can multiply
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;;
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xma.lu f10=f10,f9,f8 // f10=symtab + r_sym*syment
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;;
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getf.sig r16=f10
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;;
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;;
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add r16=8,r16 // address of st_value
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;;
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ld8 r16=[r16] // read symbol value
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;;
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add r16=r16,in0 // relocate symbol value
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;;
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cmp.eq p6,p0=R_IA64_DIR64LSB,r23
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(p6) br.cond.dptk.few 5f
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;;
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cmp.eq p6,p0=R_IA64_FPTR64LSB,r23
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(p6) br.cond.dptk.few 6f
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;;
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3:
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cmp.ltu p6,p0=0,r19 // more?
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(p6) br.cond.dptk.few 2b // loop
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mov r8=0 // success return value
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br.cond.sptk.few 9f // done
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4:
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add r16=in0,r17 // BD + A
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;;
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st8 [r15]=r16 // word64 (LSB)
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br.cond.sptk.few 3b
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5:
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add r16=r16,r17 // S + A
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;;
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st8 [r15]=r16 // word64 (LSB)
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br.cond.sptk.few 3b
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6:
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movl r17=@gprel(fptr_storage)
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;;
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add r17=r17,gp // start of fptrs
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;;
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6: cmp.geu p6,p0=r17,r2 // end of fptrs?
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(p6) br.cond.dpnt.few 7f // can't find existing fptr
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7: cmp.geu p6,p0=r17,r2 // end of fptrs?
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(p6) br.cond.dpnt.few 8f // can't find existing fptr
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ld8 r20=[r17] // read function from fptr
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;;
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cmp.eq p6,p0=r16,r20 // same function?
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;;
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;;
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(p6) st8 [r15]=r17 // reuse fptr
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(p6) br.cond.sptk.few 3b // done
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add r17=16,r17 // next fptr
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br.cond.sptk.few 6b
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7: // allocate new fptr
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br.cond.sptk.few 7b
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8: // allocate new fptr
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mov r8=1 // failure return value
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;;
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cmp.geu p6,p0=r2,r3 // space left?
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(p6) br.cond.dpnt.few 9f // bail out
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@ -501,10 +502,10 @@ STATIC_ENTRY(_reloc, 1)
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br.ret.sptk.few rp
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END(_reloc)
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.data
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.align 16
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fptr_storage:
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.global fptr_storage
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fptr_storage:
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.space 4096*16 // XXX
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fptr_storage_end:
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fptr_storage_end:
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