🚀 go-pugleaf

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Hi,
=20
I am meeting a problem that orig_r0 is overwritten by gdbserver(gdb 6.3)
on ARM.
It is because store_register/store_regs (in arm-linux-nat.c) set
register with ptrace(PTRACE_SETREGS ...)
=20
But as orig_r0 is not mapped by gdbserver, it will be overwritten.
This lost of orig_r0 will prevent the interrupted system call from being
restarted.
=20
I am new to gdbserver, so not sure whether this patch is correct,
=20
arm-linux-nat.c:
=20
-#define arm_num_regs 26
+#define arm_num_regs 27
=20
 static int arm_regmap[] =3D {
   0, 4, 8, 12, 16, 20, 24, 28,
   32, 36, 40, 44, 48, 52, 56, 60,
  -1, -1, -1, -1, -1, -1, -1, -1, -1,
-  64
+  64, 68
 };
=20
Thanks,
Tom

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<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007>Hi,</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN class=3D921291017-15032007>I am =
meeting a=20
problem that orig_r0 is overwritten by gdbserver(gdb 6.3)&nbsp;on=20
ARM.</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN class=3D921291017-15032007>It is =
because=20
store_register/store_regs&nbsp;(in arm-linux-nat.c)&nbsp;set register =
with=20
ptrace(PTRACE_SETREGS ...)</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN class=3D921291017-15032007>But =
as orig_r0 is=20
not&nbsp;mapped by gdbserver, it will be =
overwritten.</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN class=3D921291017-15032007>This =
lost of=20
orig_r0 will prevent the interrupted system call from being=20
restarted.</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN class=3D921291017-15032007>I am =
new to=20
gdbserver, so not sure&nbsp;whether this patch is =
correct,</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN =
class=3D921291017-15032007></SPAN></FONT><FONT=20
face=3DTahoma size=3D2><SPAN =
class=3D921291017-15032007></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007>arm-linux-nat.c:</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN =
class=3D921291017-15032007>-#define=20
arm_num_regs 26<BR>+#define arm_num_regs 27<BR>&nbsp;<BR>&nbsp;static =
int=20
arm_regmap[] =3D {<BR>&nbsp;&nbsp; 0, 4, 8, 12, 16, 20, 24, =
28,<BR>&nbsp;&nbsp;=20
32, 36, 40, 44, 48, 52, 56, 60,<BR>&nbsp; -1, -1, -1, -1, -1, -1, -1, =
-1,=20
-1,<BR>-&nbsp; 64</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN =
class=3D921291017-15032007>+&nbsp; 64,=20
68<BR>&nbsp;};</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007>Thanks,</SPAN></FONT></DIV>
<DIV><FONT face=3DTahoma size=3D2><SPAN=20
class=3D921291017-15032007>Tom</SPAN></FONT></DIV></BODY></HTML>

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