diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2018-06-27 17:32:53 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-07-02 11:24:59 +0200 |
| commit | c949786450d6e19ef21f0837488a3dc1554131d6 (patch) | |
| tree | f0a488519f9a504335fa48e5c3b866ab73d0a94a | |
| parent | 183ab05ff285555c56b7f00bb4fd52d80a9513fb (diff) | |
s390: correct _stext offset
Avoid unnecessary rewrite of psw and merge _stext into
startup_continue. This allows to move _stext definition to vmlinux.lds.S,
where _etext is also defined and set _stext to the actual beginning of
.text at 0x100000.
This fixes the problem with setting the last .text page as
not-executable due to vmem_map_init relying on page alinged _stext and
_etext.
Fixes: bd79d6632958 ("s390/decompressor: trim the kernel image up to 1M")
Reported-by: Nils Hoppmann <niho@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | arch/s390/kernel/head64.S | 40 | ||||
| -rw-r--r-- | arch/s390/kernel/vmlinux.lds.S | 1 |
2 files changed, 16 insertions, 25 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index 6f43faeaaf32..6d14ad42ba88 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -48,11 +48,23 @@ ENTRY(startup_continue) # Early machine initialization and detection functions. # brasl %r14,startup_init - lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space, - # virtual and never return ... + +# check control registers + stctg %c0,%c15,0(%r15) + oi 6(%r15),0x60 # enable sigp emergency & external call + oi 4(%r15),0x10 # switch on low address proctection + lctlg %c0,%c15,0(%r15) + + lam 0,15,.Laregs-.LPG1(%r13) # load acrs needed by uaccess + brasl %r14,start_kernel # go to C code +# +# We returned from start_kernel ?!? PANIK +# + basr %r13,0 + lpswe .Ldw-.(%r13) # load disabled wait psw + .align 16 .LPG1: -.Lentry:.quad 0x0000000180000000,_stext .Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space .quad 0 # cr1: primary space segment table .quad .Lduct # cr2: dispatchable unit control table @@ -85,27 +97,5 @@ ENTRY(startup_continue) .endr .Llinkage_stack: .long 0,0,0x89000000,0,0,0,0x8a000000,0 - -# -# startup-code, running in absolute addressing mode -# -ENTRY(_stext) - basr %r13,0 # get base -.LPG3: -# check control registers - stctg %c0,%c15,0(%r15) - oi 6(%r15),0x60 # enable sigp emergency & external call - oi 4(%r15),0x10 # switch on low address proctection - lctlg %c0,%c15,0(%r15) - - lam 0,15,.Laregs-.LPG3(%r13) # load acrs needed by uaccess - brasl %r14,start_kernel # go to C code -# -# We returned from start_kernel ?!? PANIK -# - basr %r13,0 - lpswe .Ldw-.(%r13) # load disabled wait psw - - .align 8 .Ldw: .quad 0x0002000180000000,0x0000000000000000 .Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S index 35f7ca8a1685..b3e95b9d99de 100644 --- a/arch/s390/kernel/vmlinux.lds.S +++ b/arch/s390/kernel/vmlinux.lds.S @@ -31,6 +31,7 @@ PHDRS { SECTIONS { . = 0x100000; + _stext = .; /* Start of text section */ .text : { /* Text and read-only data */ HEAD_TEXT |