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<pre>Op 2020-10-18 om 23:03 schreef Jonas Maebe via fpc-devel:
>><i>
</i>>>><i> I’ve been able to create a cross compiler using the guidance and some
</i>>>><i> additional information. But I’ve been unable to create the proper FPC
</i>>>><i> startup code (prt0.as) needed.
</i>>>><i>
</i>>>><i> Any help would be appreciated.
</i>>><i> I believe these files are generally created by disassembling the
</i>>><i> system's crt1.o (objdump -d) and then changing the call(s) to the libc
</i>>><i> intialisation code with calls to the FPC RTL intialisation code.
</i>>Afaik mostly gcc -S. Trunk SVN also contains an untested and incomplete
>attempt at translating the C startup files to pascal.
Thanks!
I think I maybe in over my head on this. I've taken a look and now I'm not sure what the issue is. The
segfault occurs in the FPC RTL initiazation code (see backtrace below).
Any ideas?
<a class="moz-txt-link-abbreviated" href="mailto:root@blackbird:/usr/ports/tmp/fpc-powerpc64/lib/fpc/3.2.0">root@blackbird:/usr/ports/tmp/fpc-powerpc64/lib/fpc/3.2.0</a> # gdb ./ppcppc64 ppcppc64.core
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Reading symbols from ./ppcppc64...
warning: core file may not match specified executable file.
[New LWP 100454]
Core was generated by `./ppcppc64'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x7c0802a6fbe1fff8 in ?? ()
(gdb) backtrace
#0 0x7c0802a6fbe1fff8 in ?? ()
#1 0x000000001001fed8 in $fpc_initializeunits () at ../inc/system.inc:969
#2 0x0000000010000720 in $main () at pp.pas:256
(gdb) disass
No function contains program counter for selected frame.
(gdb) frame 1
#1 0x000000001001fed8 in $fpc_initializeunits () at ../inc/system.inc:969
969 Procs[i].InitProc();
(gdb) disass
Dump of assembler code for function $fpc_initializeunits:
0x000000001001fe60 <+0>: mflr r0
0x000000001001fe64 <+4>: std r31,-8(r1)
0x000000001001fe68 <+8>: std r30,-16(r1)
0x000000001001fe6c <+12>: std r29,-24(r1)
0x000000001001fe70 <+16>: std r28,-32(r1)
0x000000001001fe74 <+20>: std r0,16(r1)
0x000000001001fe78 <+24>: stdu r1,-128(r1)
0x000000001001fe7c <+28>: bl 0x10002768 <fpc_cpuinit>
0x000000001001fe80 <+32>: nop
0x000000001001fe84 <+36>: addi r3,r2,15080
0x000000001001fe88 <+40>: ld r28,0(r3)
0x000000001001fe8c <+44>: cmpldi r28,1
0x000000001001fe90 <+48>: blt 0x1001feec <$fpc_initializeunits+140>
0x000000001001fe94 <+52>: li r31,0
0x000000001001fe98 <+56>: addi r3,r31,1
0x000000001001fe9c <+60>: mr r31,r3
0x000000001001fea0 <+64>: rldicr r4,r31,4,59
0x000000001001fea4 <+68>: addi r3,r2,15080
0x000000001001fea8 <+72>: ldx r3,r4,r3
0x000000001001feac <+76>: cmpldi r3,0
0x000000001001feb0 <+80>: beq 0x1001fedc <$fpc_initializeunits+124>
0x000000001001feb4 <+84>: rldicr r4,r31,4,59
0x000000001001feb8 <+88>: addi r3,r2,15080
0x000000001001febc <+92>: ldx r29,r4,r3
0x000000001001fec0 <+96>: ld r30,0(r29)
0x000000001001fec4 <+100>: std r2,40(r1)
0x000000001001fec8 <+104>: mtctr r30
0x000000001001fecc <+108>: ld r2,8(r29)
0x000000001001fed0 <+112>: ld r11,16(r29)
0x000000001001fed4 <+116>: bctrl
=> 0x000000001001fed8 <+120>: ld r2,40(r1)
0x000000001001fedc <+124>: addi r3,r2,15080
0x000000001001fee0 <+128>: std r31,8(r3)
0x000000001001fee4 <+132>: cmpld r31,r28
0x000000001001fee8 <+136>: blt 0x1001fe98 <$fpc_initializeunits+56>
0x000000001001feec <+140>: addi r3,r2,18272
0x000000001001fef0 <+144>: ld r3,0(r3)
0x000000001001fef4 <+148>: cmpldi r3,0
0x000000001001fef8 <+152>: beq 0x1001ff20 <$fpc_initializeunits+192>
0x000000001001fefc <+156>: addi r3,r2,18272
0x000000001001ff00 <+160>: ld r31,0(r3)
0x000000001001ff04 <+164>: ld r30,0(r31)
0x000000001001ff08 <+168>: std r2,40(r1)
0x000000001001ff0c <+172>: mtctr r30
0x000000001001ff10 <+176>: ld r2,8(r31)
0x000000001001ff14 <+180>: ld r11,16(r31)
0x000000001001ff18 <+184>: bctrl
0x000000001001ff1c <+188>: ld r2,40(r1)
0x000000001001ff20 <+192>: addi r1,r1,128
0x000000001001ff24 <+196>: ld r31,-8(r1)
0x000000001001ff28 <+200>: ld r30,-16(r1)
0x000000001001ff2c <+204>: ld r29,-24(r1)
0x000000001001ff30 <+208>: ld r28,-32(r1)
0x000000001001ff34 <+212>: ld r0,16(r1)
0x000000001001ff38 <+216>: mtlr r0
0x000000001001ff3c <+220>: blr
End of assembler dump.
</pre>
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