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// Copyright 2020 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package powerpc
import (
"math/rand"
"github.com/google/syzkaller/pkg/ifuzz/iset"
)
const (
// Valid hcall humbers at the momemt are: 4..0x450.
MaxHcall = 0x450 // MAX_HCALL
SprnSrr0 = 0x01A // pc for rfid (SPRN_SRR0)
SprnSrr1 = 0x01B // msr for rfid (SPRN_SRR1)
)
// nolint:dupl
func (insnset *InsnSet) initPseudo() {
insnset.Insns = append(insnset.Insns, &Insn{
Name: "PSEUDO_hypercall",
Priv: true,
Pseudo: true,
generator: func(cfg *iset.Config, r *rand.Rand) []byte {
gen := makeGen(insnset, cfg, r)
gen.sc(1)
return gen.text
},
})
insnset.Insns = append(insnset.Insns, &Insn{
Name: "PSEUDO_syscall",
Priv: true,
Pseudo: true,
generator: func(cfg *iset.Config, r *rand.Rand) []byte {
gen := makeGen(insnset, cfg, r)
gen.sc(0)
return gen.text
},
})
insnset.Insns = append(insnset.Insns, &Insn{
Name: "PSEUDO_ultracall",
Priv: true,
Pseudo: true,
generator: func(cfg *iset.Config, r *rand.Rand) []byte {
gen := makeGen(insnset, cfg, r)
gen.sc(2)
return gen.text
},
})
insnset.Insns = append(insnset.Insns, &Insn{
Name: "PSEUDO_rtas",
Priv: true,
Pseudo: true,
generator: func(cfg *iset.Config, r *rand.Rand) []byte {
gen := makeGen(insnset, cfg, r)
gen.rtas()
return gen.text
},
})
insnset.Insns = append(insnset.Insns, &Insn{
Name: "PSEUDO_rfid",
Priv: true,
Pseudo: true,
generator: func(cfg *iset.Config, r *rand.Rand) []byte {
gen := makeGen(insnset, cfg, r)
gen.rfid()
return gen.text
},
})
}
type generator struct {
imap insnSetMap
cfg *iset.Config
r *rand.Rand
text []byte
}
func makeGen(insnset *InsnSet, cfg *iset.Config, r *rand.Rand) *generator {
return &generator{
imap: insnset.insnMap,
cfg: cfg,
r: r,
}
}
func (gen *generator) byte(v []byte) {
gen.text = append(gen.text, v...)
}
func (gen *generator) sc(lev uint) {
imap := gen.imap
n := gen.r.Intn(9)
hcrange := gen.r.Intn(3)
offset := 4
maxhc := MaxHcall
switch hcrange {
case 1:
offset = 0xf000
maxhc = 0xf810
case 2:
offset = 0xef00
maxhc = 0xef20
}
hc := gen.r.Intn((maxhc-offset)/4)*4 + offset
gen.byte(imap.ld64(3, uint64(hc)))
for i := 4; i < n+4; i++ {
gen.byte(imap.ld64(uint(i), gen.r.Uint64()))
}
gen.byte(imap.sc(lev))
}
func (gen *generator) rtas() {
imap := gen.imap
addr := iset.GenerateInt(gen.cfg, gen.r, 8)
token := uint32(gen.r.Intn(8) << 24) // There are only 4 tokens handled by KVM and it is BigEndian.
reg := uint(iset.GenerateInt(gen.cfg, gen.r, 4))
gen.byte(imap.ldgpr32(reg, reg+uint(1), addr, token))
for i := 0; i < gen.r.Intn(4)+1; i++ {
gen.byte(imap.ldgpr32(reg, reg+uint(1), addr+uint64(i*4),
uint32(iset.GenerateInt(gen.cfg, gen.r, 4))))
}
gen.byte(imap.ld64(3, 0xF000)) // 0xF000 is a custom H_RTAS hypercall
gen.byte(imap.ld64(4, addr))
gen.byte(imap.sc(1))
}
func (gen *generator) rfid() {
imap := gen.imap
tmpreg := uint(gen.r.Intn(32))
// SRR0 contains a PC
gen.byte(imap.ld64(tmpreg, iset.GenerateInt(gen.cfg, gen.r, 8)))
gen.byte(imap["mtspr"].enc(map[string]uint{"RS": tmpreg, "SPR": SprnSrr0}))
// SRR1 contains an MSR
gen.byte(imap.ld64(tmpreg, gen.r.Uint64()))
gen.byte(imap["mtspr"].enc(map[string]uint{"RS": tmpreg, "SPR": SprnSrr1}))
gen.byte(imap["rfid"].enc(map[string]uint{}))
}
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