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s390/boot: Convert tprot() to extable

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Shorten tprot() and use regular EX_TABLE program check handling.

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2025-02-24 15:59:08 +01:00 committed by Vasily Gorbik
parent 0b4bf776f3
commit 7063bb2900
1 changed files with 5 additions and 19 deletions
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24
arch/s390/boot/physmem_info.c
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@ -137,31 +137,17 @@ static int diag500_storage_limit(unsigned long *max_physmem_end)
static int tprot(unsigned long addr)
{
unsigned long reg1, reg2;
int cc, exception;
psw_t old;
exception = 1;
asm volatile(
" mvc 0(16,%[psw_old]),0(%[psw_pgm])\n"
" epsw %[reg1],%[reg2]\n"
" st %[reg1],0(%[psw_pgm])\n"
" st %[reg2],4(%[psw_pgm])\n"
" larl %[reg1],1f\n"
" stg %[reg1],8(%[psw_pgm])\n"
" tprot 0(%[addr]),0\n"
" lhi %[exc],0\n"
"1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
"0: lhi %[exc],0\n"
"1:\n"
CC_IPM(cc)
: CC_OUT(cc, cc),
[exc] "+d" (exception),
[reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
"=Q" (get_lowcore()->program_new_psw.addr),
"=Q" (old)
: [psw_old] "a" (&old),
[psw_pgm] "a" (&get_lowcore()->program_new_psw),
[addr] "a" (addr)
EX_TABLE(0b, 1b)
: CC_OUT(cc, cc), [exc] "+d" (exception)
: [addr] "a" (addr)
: CC_CLOBBER_LIST("memory"));
cc = exception ? -EFAULT : CC_TRANSFORM(cc);
return cc;