diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/flat.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/flat.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/flat.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/flat.c new file mode 100644 index 000000000..e8eb4595f --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/flat.c @@ -0,0 +1,206 @@ +/* + * arch/ubicom32/kernel/flat.c + * Ubicom32 architecture flat executable format support. + * + * (C) Copyright 2009, Ubicom, Inc. + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port is free software: you can redistribute + * it and/or modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + */ +#include <linux/module.h> +#include <linux/types.h> +#include <linux/flat.h> + +unsigned long ubicom32_flat_get_addr_from_rp(unsigned long *rp, + u32_t relval, + u32_t flags, + unsigned long *persistent) +{ + u32_t relval_reloc_type = relval >> 27; + u32_t insn = *rp; + + if (*persistent) { + /* + * relval holds the relocation that has to be adjusted. + */ + if (relval == 0) { + *persistent = 0; + } + + return relval; + } + + if (relval_reloc_type == R_UBICOM32_32) { + /* + * insn holds the relocation + */ + return insn; + } + + /* + * We don't know this one. + */ + return 0; +} + +void ubicom32_flat_put_addr_at_rp(unsigned long *rp, + u32_t val, + u32_t relval, + unsigned long *persistent) +{ + u32_t reloc_type = (relval >> 27) & 0x1f; + u32_t insn = *rp; + + /* + * If persistent is set then it contains the relocation type. + */ + if (*persistent) { + /* + * If persistent is set then it contains the relocation type. + */ + reloc_type = (*persistent >> 27) & 0x1f; + } + + switch (reloc_type) { + case R_UBICOM32_32: + /* + * Store the 32 bits as is. + */ + *rp = val; + break; + case R_UBICOM32_HI24: + { + /* + * 24 bit relocation that is part of the MOVEAI + * instruction. The 24 bits come from bits 7 - 30 of the + * relocation. The 24 bits eventually get split into 2 + * fields in the instruction encoding. + * + * - Bits 7 - 27 of the relocation are encoded into bits + * 0 - 20 of the instruction. + * + * - Bits 28 - 30 of the relocation are encoded into bit + * 24 - 26 of the instruction. + */ + u32_t mask = 0x1fffff | (0x7 << 24); + u32_t valid24bits = (val >> 7) & 0xffffff; + u32_t bot_21 = valid24bits & 0x1fffff; + u32_t upper_3_bits = ((valid24bits & 0xe00000) << 3); + insn &= ~mask; + + insn |= bot_21; + insn |= upper_3_bits; + *rp = insn; + } + break; + case R_UBICOM32_LO7_S: + case R_UBICOM32_LO7_2_S: + case R_UBICOM32_LO7_4_S: + { + /* + * Bits 0 - 6 of the relocation are encoded into the + * 7bit unsigned immediate fields of the SOURCE-1 field + * of the instruction. The immediate value is left + * shifted by (0, 1, 2) based on the operand size. + */ + u32_t mask = 0x1f | (0x3 << 8); + u32_t bottom, top; + val &= 0x7f; + if (reloc_type == R_UBICOM32_LO7_2_S) { + val >>= 1; + } else if (reloc_type == R_UBICOM32_LO7_4_S) { + val >>= 2; + } + + bottom = val & 0x1f; + top = val >> 5; + insn &= ~mask; + insn |= bottom; + insn |= (top << 8); + BUG_ON(*rp != insn); + *rp = insn; + break; + } + case R_UBICOM32_LO7_D: + case R_UBICOM32_LO7_2_D: + case R_UBICOM32_LO7_4_D: + { + /* + * Bits 0 - 6 of the relocation are encoded into the + * 7bit unsigned immediate fields of the DESTINATION + * field of the instruction. The immediate value is + * left shifted by (0, 1, 2) based on the operand size. + */ + u32_t mask = (0x1f | (0x3 << 8)) << 16; + u32_t bottom, top; + val &= 0x7f; + if (reloc_type == R_UBICOM32_LO7_2_D) { + val >>= 1; + } else if (reloc_type == R_UBICOM32_LO7_4_D) { + val >>= 2; + } + bottom = (val & 0x1f) << 16; + top = (val >> 5) << 16; + insn &= ~mask; + insn |= bottom; + insn |= (top << 8); + BUG_ON(*rp != insn); + *rp = insn; + break; + } + case R_UBICOM32_LO7_CALLI: + case R_UBICOM32_LO16_CALLI: + { + /* + * Extract the offset for a CALLI instruction. The + * offsets can be either 7 bits or 18 bits. Since all + * instructions in ubicom32 architecture are at work + * aligned addresses the truncated offset is right + * shifted by 2 before being encoded in the instruction. + */ + if (reloc_type == R_UBICOM32_LO7_CALLI) { + val &= 0x7f; + } else { + val &= 0x3ffff; + } + + val >>= 2; + + insn &= ~0x071f071f; + insn |= (val & 0x1f) << 0; + val >>= 5; + insn |= (val & 0x07) << 8; + val >>= 3; + insn |= (val & 0x1f) << 16; + val >>= 5; + insn |= (val & 0x07) << 24; + if (reloc_type == R_UBICOM32_LO7_CALLI) { + BUG_ON(*rp != insn); + } + *rp = insn; + } + break; + } + + if (*persistent) { + *persistent = 0; + } +} |