[Linux-Xtensa] Running linux in xtensa simulator (Follow the
source Luke. xt-gdb is your friend :)
Mahavir Prasad
er.mahavir at gmail.com
Fri Dec 9 05:54:15 PST 2011
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mahavir at mahavir-desktop:~/Desktop/lahaina/git_checkout/lah_build/build-iss$ xt-gdb arch/xtensa/boot/Image.elf
GNU gdb 6.8 Xtensa Tools 9.0.1
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=i686-pc-linux-gnu --target=xtensa-elf"...
(xt-gdb) source .xt-gdbinit_without_turbo
"Using MMU, assumne V2 MMU Mappings
""add-symbol-file vmlinux 0xd0003000
"add symbol table from file "vmlinux" at
.text_addr = 0xd0003000
"target sim --memlimit=128
"Connected to the simulator.
Breakpoint 1 at 0x104: file /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/boot/boot-elf/bootstrap.S, line 93.
"Starting Simulation
"Breakpoint 2 at 0x0: file /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/boot/boot-elf/bootstrap.S, line 44.
Breakpoint 3 at 0xd0003003: file /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/kernel/head.S, line 66.
Breakpoint 4 at 0xd000303a: file /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/kernel/head.S, line 190.
".xt-gdbinit: Done
"(xt-gdb) run
Starting program: /home/mahavir/Desktop/lahaina/git_checkout/lah_build/build-iss/arch/xtensa/boot/Image.elf
Starting the ISS simulator.
warning: Connection timed out to ISS. Retrying...
Switching to remote protocol
Remote debugging using localhost:64963
^C^CInterrupted while waiting for the program.
Give up (and stop debugging it)? (y or n) y
(xt-gdb) run
Starting program: /home/mahavir/Desktop/lahaina/git_checkout/lah_build/build-iss/arch/xtensa/boot/Image.elf
Starting the ISS simulator.
warning: Connection timed out to ISS. Retrying...
Switching to remote protocol
Remote debugging using localhost:62954
Breakpoint 2, ?? () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/boot/boot-elf/bootstrap.S:44
44 _j _SetupMMU
Current language: auto; currently asm
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:87
87 movi a3, 0x15 /* non-MX -- always RCW */
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:89
89 wsr a3, ATOMCTL
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:178
178 movi a1, 0 // Set $sp to NULL to minimize gdb confusion trying to walk up the stack
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:180
180 _call0 1f // get PC in a PIC manner (don't rely on literal constants)
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:186
186 1: movi a2, 0x10000000
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:187
187 movi a3, 0x18000000
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:188
188 add a2, a2, a0 // a2 = 0x10000000 + original_pc
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:189
189 bltu a2, a3, 1f // is PC >= 0xF0000000, or PC < 0x08000000 ?
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:200
200 movi a2, 0x40000006 // 512MB region at vaddr 0x40000000, way 6
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:201
201 idtlb a2 // kick it out...
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:202
202 iitlb a2
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:203
203 isync
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:211
211 srli a3, a0, 27 // get 128MB area containing PC ...
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:212
212 slli a3, a3, 27 // ...
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:213
213 addi a3, a3, CA_BYPASS // bypass-cache access R/W Executable
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:214
214 addi a7, a2, -1 // 128MB region at vaddr 0x40000000, way 5
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:215
215 wdtlb a3, a7 // setup mapping...
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:216
216 witlb a3, a7 // ...
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:217
217 isync // ...
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:226
226 slli a4, a0, 5 // clear upper 5 bits of PC (get 128MB relative offset)
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:227
227 srli a4, a4, 5 // ...
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:228
228 addi a5, a2, -6 // a5 = 0x40000000
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:229
229 add a4, a4, a5 // address of above "j 2f" in 128MB page at vaddr 0x40000000
(xt-gdb) n
_SetupMMU () at /home/mahavir/Desktop/lahaina/git_checkout/lah_build/linux/arch/xtensa/include/asm/initialize_mmu.h:230
230 jx a4 // Note: jumps to 0x46000043; xt-gdb switches to remapped text section
(xt-gdb) n
0x4000004c in ?? ()
(xt-gdb) n
Cannot find bounds of current function
(xt-gdb) n
Cannot find bounds of current function
(xt-gdb) info all-registers
pc 0x4000004c 0x4000004c
ar0 0x4c 0x4c
ar1 0x0 0x0
ar2 0x40000006 0x40000006
ar3 0x3 0x3
ar4 0x4000004c 0x4000004c
ar5 0x40000000 0x40000000
ar6 0x0 0x0
ar7 0x40000005 0x40000005
ar8 0x0 0x0
ar9 0x0 0x0
ar10 0x0 0x0
ar11 0x0 0x0
ar12 0x0 0x0
ar13 0x0 0x0
ar14 0x0 0x0
ar15 0x0 0x0
ar16 0x0 0x0
ar17 0x0 0x0
ar18 0x0 0x0
ar19 0x0 0x0
ar20 0x0 0x0
ar21 0x0 0x0
ar22 0x0 0x0
ar23 0x0 0x0
ar24 0x0 0x0
ar25 0x0 0x0
ar26 0x0 0x0
ar27 0x0 0x0
ar28 0x0 0x0
ar29 0x0 0x0
ar30 0x0 0x0
ar31 0x0 0x0
lbeg 0x0 0x0
lend 0x0 0x0
lcount 0x0 0x0
sar 0x0 0x0
windowbase 0x0 0x0
windowstart 0x1 0x1
sr176 0xc1a3dffe 0xc1a3dffe
sr208 0x14431885 0x14431885
ps 0x1f 0x1f
threadptr 0x0 0x0
scompare1 0x0 0x0
acclo 0x0 0x0
acchi 0x0 0x0
m0 0x0 0x0
m1 0x0 0x0
m2 0x0 0x0
m3 0x0 0x0
expstate 0x0 0x0
ptevaddr 0x0 0x0
mmid 0x0 0x0
rasid 0x4030200 0x4030200
itlbcfg 0x0 0x0
dtlbcfg 0x0 0x0
ibreakenable 0x0 0x0
atomctl 0x15 0x15
ddr 0x0 0x0
ibreaka0 0x0 0x0
ibreaka1 0x0 0x0
dbreaka0 0x0 0x0
dbreaka1 0x0 0x0
dbreakc0 0x0 0x0
dbreakc1 0x0 0x0
epc1 0x0 0x0
epc2 0x0 0x0
epc3 0x0 0x0
epc4 0x0 0x0
epc5 0x0 0x0
epc6 0x0 0x0
epc7 0x0 0x0
depc 0x0 0x0
eps2 0x0 0x0
eps3 0x0 0x0
eps4 0x0 0x0
eps5 0x0 0x0
eps6 0x0 0x0
eps7 0x0 0x0
excsave1 0x0 0x0
excsave2 0x0 0x0
excsave3 0x0 0x0
excsave4 0x0 0x0
excsave5 0x0 0x0
excsave6 0x0 0x0
excsave7 0x0 0x0
cpenable 0xff 0xff
interrupt 0x0 0x0
intset 0x0 0x0
intclear 0x0 0x0
intenable 0x0 0x0
vecbase 0x2000 0x2000
exccause 0x0 0x0
debugcause 0x0 0x0
ccount 0xec 0xec
prid 0x0 0x0
icount 0x0 0x0
icountlevel 0x0 0x0
excvaddr 0x0 0x0
ccompare0 0x0 0x0
ccompare1 0x0 0x0
ccompare2 0x0 0x0
misc0 0x0 0x0
misc1 0x0 0x0
a0 0x4c 0x4c
a1 0x0 0x0
a2 0x40000006 0x40000006
a3 0x3 0x3
a4 0x4000004c 0x4000004c
a5 0x40000000 0x40000000
a6 0x0 0x0
a7 0x40000005 0x40000005
a8 0x0 0x0
a9 0x0 0x0
a10 0x0 0x0
a11 0x0 0x0
a12 0x0 0x0
a13 0x0 0x0
a14 0x0 0x0
a15 0x0 0x0
psintlevel 0xf 0xf
psum 0x0 0x0
pswoe 0x0 0x0
psring 0x0 0x0
psexcm 0x1 0x1
pscallinc 0x0 0x0
psowb 0x0 0x0
acc 0x0 0x0
dbnum 0x0 0x0
asid3 0x4 0x4
asid2 0x3 0x3
asid1 0x2 0x2
instpgszid6 0x0 0x0
instpgszid5 0x0 0x0
instpgszid4 0x0 0x0
datapgszid6 0x0 0x0
datapgszid5 0x0 0x0
datapgszid4 0x0 0x0
ptbase 0x0 0x0
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