From ee077885e5d182d0d9fba090f3505f16f640dff7 Mon Sep 17 00:00:00 2001 From: "James Bowman (FTDI-UK)" Date: Tue, 24 Aug 2021 02:16:56 +0000 Subject: FT32: Remove recursion in ft32_opcode The function ft32_opcode used recursion. This could cause a stack overflow. Replaced with a pair of non-recursive functions. PR 28169 * ft32-dis.c: Formatting. (ft32_opcode1): Split out from.. (ft32_opcode): ..here. --- opcodes/ft32-dis.c | 229 +++++++++++++++++++++++++++-------------------------- 1 file changed, 115 insertions(+), 114 deletions(-) (limited to 'opcodes') diff --git a/opcodes/ft32-dis.c b/opcodes/ft32-dis.c index cefc99d..6c68dea 100644 --- a/opcodes/ft32-dis.c +++ b/opcodes/ft32-dis.c @@ -33,16 +33,15 @@ static fprintf_ftype fpr; static void *stream; static int -sign_extend(int bit, int value) +sign_extend (int bit, int value) { int onebit = (1 << bit); return (value & (onebit - 1)) - (value & onebit); } static void -ft32_opcode(bfd_vma addr ATTRIBUTE_UNUSED, - unsigned int iword, - struct disassemble_info *info) +ft32_opcode1 (unsigned int iword, + struct disassemble_info *info) { const ft32_opc_info_t *oo; @@ -50,14 +49,6 @@ ft32_opcode(bfd_vma addr ATTRIBUTE_UNUSED, if ((iword & oo->mask) == oo->bits) break; - unsigned int sc[2]; - if (ft32_decode_shortcode((unsigned int)addr, iword, sc)) - { - ft32_opcode(addr, sc[0], info); - fpr (stream, " ; "); - ft32_opcode(addr, sc[1], info); - } - if (oo->name) { int f = oo->fields; @@ -65,113 +56,123 @@ ft32_opcode(bfd_vma addr ATTRIBUTE_UNUSED, fpr (stream, "%s", oo->name); if (oo->dw) - { - fpr (stream, ".%c ", "bsl"[(iword >> FT32_FLD_DW_BIT) & 3]); - } + fpr (stream, ".%c ", "bsl"[(iword >> FT32_FLD_DW_BIT) & 3]); else - { - fpr (stream, " "); - } + fpr (stream, " "); while (f) - { - int lobit = f & -f; - if (f & lobit) - { - switch (lobit) - { - case FT32_FLD_CBCRCV: - /* imm is {CB, CV} */ - imm = ((iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1)) << 4; - imm |= ((iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1)); - switch (imm) - { - case 0x00: fpr(stream, "nz"); break; - case 0x01: fpr(stream, "z"); break; - case 0x10: fpr(stream, "ae"); break; - case 0x11: fpr(stream, "b"); break; - case 0x20: fpr(stream, "no"); break; - case 0x21: fpr(stream, "o"); break; - case 0x30: fpr(stream, "ns"); break; - case 0x31: fpr(stream, "s"); break; - case 0x40: fpr(stream, "lt"); break; - case 0x41: fpr(stream, "gte"); break; - case 0x50: fpr(stream, "lte"); break; - case 0x51: fpr(stream, "gt"); break; - case 0x60: fpr(stream, "be"); break; - case 0x61: fpr(stream, "a"); break; - default: fpr(stream, "%d,$r30,%d", (imm >> 4), (imm & 1)); break; - } - break; - case FT32_FLD_CB: - imm = (iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1); - fpr(stream, "%d", imm); - break; - case FT32_FLD_R_D: - fpr(stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f); - break; - case FT32_FLD_CR: - imm = (iword >> FT32_FLD_CR_BIT) & ((1 << FT32_FLD_CR_SIZ) - 1); - fpr(stream, "$r%d", 28 + imm); - break; - case FT32_FLD_CV: - imm = (iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1); - fpr(stream, "%d", imm); - break; - case FT32_FLD_R_1: - fpr(stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f); - break; - case FT32_FLD_RIMM: - imm = (iword >> FT32_FLD_RIMM_BIT) & ((1 << FT32_FLD_RIMM_SIZ) - 1); - if (imm & 0x400) - fpr(stream, "%d", sign_extend(9, imm)); - else - fpr(stream, "$r%d", imm & 0x1f); - break; - case FT32_FLD_R_2: - fpr(stream, "$r%d", (iword >> FT32_FLD_R_2_BIT) & 0x1f); - break; - case FT32_FLD_K20: - imm = iword & ((1 << FT32_FLD_K20_SIZ) - 1); - fpr(stream, "%d", sign_extend(19, imm)); - break; - case FT32_FLD_PA: - imm = (iword & ((1 << FT32_FLD_PA_SIZ) - 1)) << 2; - info->print_address_func ((bfd_vma) imm, info); - break; - case FT32_FLD_AA: - imm = iword & ((1 << FT32_FLD_AA_SIZ) - 1); - info->print_address_func ((1 << 23) | (bfd_vma) imm, info); - break; - case FT32_FLD_K16: - imm = iword & ((1 << FT32_FLD_K16_SIZ) - 1); - fpr(stream, "%d", imm); - break; - case FT32_FLD_K15: - imm = iword & ((1 << FT32_FLD_K15_SIZ) - 1); - fpr(stream, "%d", sign_extend(14, imm)); - break; - case FT32_FLD_R_D_POST: - fpr(stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f); - break; - case FT32_FLD_R_1_POST: - fpr(stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f); - break; - default: - break; - } - f &= ~lobit; - if (f) - { - fpr(stream, ","); - } - } - } + { + int lobit = f & -f; + if (f & lobit) + { + switch (lobit) + { + case FT32_FLD_CBCRCV: + /* imm is {CB, CV} */ + imm = ((iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1)) << 4; + imm |= ((iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1)); + switch (imm) + { + case 0x00: fpr (stream, "nz"); break; + case 0x01: fpr (stream, "z"); break; + case 0x10: fpr (stream, "ae"); break; + case 0x11: fpr (stream, "b"); break; + case 0x20: fpr (stream, "no"); break; + case 0x21: fpr (stream, "o"); break; + case 0x30: fpr (stream, "ns"); break; + case 0x31: fpr (stream, "s"); break; + case 0x40: fpr (stream, "lt"); break; + case 0x41: fpr (stream, "gte"); break; + case 0x50: fpr (stream, "lte"); break; + case 0x51: fpr (stream, "gt"); break; + case 0x60: fpr (stream, "be"); break; + case 0x61: fpr (stream, "a"); break; + default: + fpr (stream, "%d,$r30,%d", (imm >> 4), (imm & 1)); + break; + } + break; + case FT32_FLD_CB: + imm = (iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1); + fpr (stream, "%d", imm); + break; + case FT32_FLD_R_D: + fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f); + break; + case FT32_FLD_CR: + imm = (iword >> FT32_FLD_CR_BIT) & ((1 << FT32_FLD_CR_SIZ) - 1); + fpr (stream, "$r%d", 28 + imm); + break; + case FT32_FLD_CV: + imm = (iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1); + fpr (stream, "%d", imm); + break; + case FT32_FLD_R_1: + fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f); + break; + case FT32_FLD_RIMM: + imm = (iword >> FT32_FLD_RIMM_BIT) & ((1 << FT32_FLD_RIMM_SIZ) - 1); + if (imm & 0x400) + fpr (stream, "%d", sign_extend (9, imm)); + else + fpr (stream, "$r%d", imm & 0x1f); + break; + case FT32_FLD_R_2: + fpr (stream, "$r%d", (iword >> FT32_FLD_R_2_BIT) & 0x1f); + break; + case FT32_FLD_K20: + imm = iword & ((1 << FT32_FLD_K20_SIZ) - 1); + fpr (stream, "%d", sign_extend (19, imm)); + break; + case FT32_FLD_PA: + imm = (iword & ((1 << FT32_FLD_PA_SIZ) - 1)) << 2; + info->print_address_func ((bfd_vma) imm, info); + break; + case FT32_FLD_AA: + imm = iword & ((1 << FT32_FLD_AA_SIZ) - 1); + info->print_address_func ((1 << 23) | (bfd_vma) imm, info); + break; + case FT32_FLD_K16: + imm = iword & ((1 << FT32_FLD_K16_SIZ) - 1); + fpr (stream, "%d", imm); + break; + case FT32_FLD_K15: + imm = iword & ((1 << FT32_FLD_K15_SIZ) - 1); + fpr (stream, "%d", sign_extend (14, imm)); + break; + case FT32_FLD_R_D_POST: + fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f); + break; + case FT32_FLD_R_1_POST: + fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f); + break; + default: + break; + } + f &= ~lobit; + if (f) + fpr (stream, ","); + } + } } - else + else + fpr (stream, "!"); +} + +static void +ft32_opcode (bfd_vma addr ATTRIBUTE_UNUSED, + unsigned int iword, + struct disassemble_info *info) +{ + unsigned int sc[2]; + if (ft32_decode_shortcode ((unsigned int) addr, iword, sc)) { - fpr (stream, "!"); + ft32_opcode1 (sc[0], info); + fpr (stream, " ; "); + ft32_opcode1 (sc[1], info); } + else + ft32_opcode1 (iword, info); } int @@ -191,7 +192,7 @@ print_insn_ft32 (bfd_vma addr, struct disassemble_info *info) fpr (stream, "%08x ", iword); - ft32_opcode(addr, iword, info); + ft32_opcode (addr, iword, info); return 4; 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