Commit a8ef95a0 authored by Russell King's avatar Russell King Committed by Daniel Borkmann

ARM: net: bpf: provide load/store ops with negative immediates

Provide a set of load/store opcode generators that work with negative
immediates as well as positive ones.
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent d449ceb1
......@@ -239,6 +239,34 @@ static int16_t imm8m(u32 x)
return -1;
}
static u32 arm_bpf_ldst_imm12(u32 op, u8 rt, u8 rn, s16 imm12)
{
op |= rt << 12 | rn << 16;
if (imm12 >= 0)
op |= ARM_INST_LDST__U;
else
imm12 = -imm12;
return op | (imm12 & 0xfff);
}
static u32 arm_bpf_ldst_imm8(u32 op, u8 rt, u8 rn, s16 imm8)
{
op |= rt << 12 | rn << 16;
if (imm8 >= 0)
op |= ARM_INST_LDST__U;
else
imm8 = -imm8;
return op | (imm8 & 0xf0) << 4 | (imm8 & 0x0f);
}
#define ARM_LDR_I(rt, rn, off) arm_bpf_ldst_imm12(ARM_INST_LDR_I, rt, rn, off)
#define ARM_LDRB_I(rt, rn, off) arm_bpf_ldst_imm12(ARM_INST_LDRB_I, rt, rn, off)
#define ARM_LDRH_I(rt, rn, off) arm_bpf_ldst_imm8(ARM_INST_LDRH_I, rt, rn, off)
#define ARM_STR_I(rt, rn, off) arm_bpf_ldst_imm12(ARM_INST_STR_I, rt, rn, off)
#define ARM_STRB_I(rt, rn, off) arm_bpf_ldst_imm12(ARM_INST_STRB_I, rt, rn, off)
#define ARM_STRH_I(rt, rn, off) arm_bpf_ldst_imm8(ARM_INST_STRH_I, rt, rn, off)
/*
* Initializes the JIT space with undefined instructions.
*/
......
......@@ -77,11 +77,12 @@
#define ARM_INST_EOR_R 0x00200000
#define ARM_INST_EOR_I 0x02200000
#define ARM_INST_LDRB_I 0x05d00000
#define ARM_INST_LDST__U 0x00800000
#define ARM_INST_LDRB_I 0x05500000
#define ARM_INST_LDRB_R 0x07d00000
#define ARM_INST_LDRH_I 0x01d000b0
#define ARM_INST_LDRH_I 0x015000b0
#define ARM_INST_LDRH_R 0x019000b0
#define ARM_INST_LDR_I 0x05900000
#define ARM_INST_LDR_I 0x05100000
#define ARM_INST_LDR_R 0x07900000
#define ARM_INST_LDM 0x08900000
......@@ -124,9 +125,9 @@
#define ARM_INST_SBC_R 0x00c00000
#define ARM_INST_SBCS_R 0x00d00000
#define ARM_INST_STR_I 0x05800000
#define ARM_INST_STRB_I 0x05c00000
#define ARM_INST_STRH_I 0x01c000b0
#define ARM_INST_STR_I 0x05000000
#define ARM_INST_STRB_I 0x05400000
#define ARM_INST_STRH_I 0x014000b0
#define ARM_INST_TST_R 0x01100000
#define ARM_INST_TST_I 0x03100000
......@@ -183,17 +184,14 @@
#define ARM_EOR_R(rd, rn, rm) _AL3_R(ARM_INST_EOR, rd, rn, rm)
#define ARM_EOR_I(rd, rn, imm) _AL3_I(ARM_INST_EOR, rd, rn, imm)
#define ARM_LDR_I(rt, rn, off) (ARM_INST_LDR_I | (rt) << 12 | (rn) << 16 \
| ((off) & 0xfff))
#define ARM_LDR_R(rt, rn, rm) (ARM_INST_LDR_R | (rt) << 12 | (rn) << 16 \
#define ARM_LDR_R(rt, rn, rm) (ARM_INST_LDR_R | ARM_INST_LDST__U \
| (rt) << 12 | (rn) << 16 \
| (rm))
#define ARM_LDRB_I(rt, rn, off) (ARM_INST_LDRB_I | (rt) << 12 | (rn) << 16 \
| (off))
#define ARM_LDRB_R(rt, rn, rm) (ARM_INST_LDRB_R | (rt) << 12 | (rn) << 16 \
#define ARM_LDRB_R(rt, rn, rm) (ARM_INST_LDRB_R | ARM_INST_LDST__U \
| (rt) << 12 | (rn) << 16 \
| (rm))
#define ARM_LDRH_I(rt, rn, off) (ARM_INST_LDRH_I | (rt) << 12 | (rn) << 16 \
| (((off) & 0xf0) << 4) | ((off) & 0xf))
#define ARM_LDRH_R(rt, rn, rm) (ARM_INST_LDRH_R | (rt) << 12 | (rn) << 16 \
#define ARM_LDRH_R(rt, rn, rm) (ARM_INST_LDRH_R | ARM_INST_LDST__U \
| (rt) << 12 | (rn) << 16 \
| (rm))
#define ARM_LDM(rn, regs) (ARM_INST_LDM | (rn) << 16 | (regs))
......@@ -254,13 +252,6 @@
#define ARM_SUBS_I(rd, rn, imm) _AL3_I(ARM_INST_SUBS, rd, rn, imm)
#define ARM_SBC_I(rd, rn, imm) _AL3_I(ARM_INST_SBC, rd, rn, imm)
#define ARM_STR_I(rt, rn, off) (ARM_INST_STR_I | (rt) << 12 | (rn) << 16 \
| ((off) & 0xfff))
#define ARM_STRH_I(rt, rn, off) (ARM_INST_STRH_I | (rt) << 12 | (rn) << 16 \
| (((off) & 0xf0) << 4) | ((off) & 0xf))
#define ARM_STRB_I(rt, rn, off) (ARM_INST_STRB_I | (rt) << 12 | (rn) << 16 \
| (((off) & 0xf0) << 4) | ((off) & 0xf))
#define ARM_TST_R(rn, rm) _AL3_R(ARM_INST_TST, 0, rn, rm)
#define ARM_TST_I(rn, imm) _AL3_I(ARM_INST_TST, 0, rn, imm)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment