diff options
author | Richard Sandiford <rdsandiford@googlemail.com> | 2013-07-14 13:13:43 +0000 |
---|---|---|
committer | Richard Sandiford <rdsandiford@googlemail.com> | 2013-07-14 13:13:43 +0000 |
commit | 77bd43460202d21c78868083659fb2912f6466e7 (patch) | |
tree | eef507ad9015d6c389f0e4883b2fa164c0a81354 /gas/config/tc-mips.c | |
parent | cc537e567a207d4d5a78e2438d9d459b2ae55428 (diff) | |
download | gdb-77bd43460202d21c78868083659fb2912f6466e7.zip gdb-77bd43460202d21c78868083659fb2912f6466e7.tar.gz gdb-77bd43460202d21c78868083659fb2912f6466e7.tar.bz2 |
gas/
* config/tc-mips.c (imm_expr, imm2_expr, offset_expr): Tweak commentary.
(imm_reloc): Delete.
(md_assemble): Remove imm_reloc handling.
(mips_ip): Update commentary. Use offset_expr and offset_reloc
rather than imm_expr and imm_reloc for 'i', 'j' and 'u'.
Use a temporary array rather than imm_reloc when parsing
constant expressions. Remove imm_reloc initialization.
(mips16_ip): Update commentary. Use offset_expr and offset_reloc
for the relaxable field. Use a relax_char variable to track the
type of this field. Remove imm_reloc initialization.
Diffstat (limited to 'gas/config/tc-mips.c')
-rw-r--r-- | gas/config/tc-mips.c | 144 |
1 files changed, 70 insertions, 74 deletions
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c index ef5c466..da2eeeb 100644 --- a/gas/config/tc-mips.c +++ b/gas/config/tc-mips.c @@ -1810,17 +1810,18 @@ mips_mark_labels (void) static char *expr_end; -/* Expressions which appear in instructions. These are set by - mips_ip. */ +/* Expressions which appear in macro instructions. These are set by + mips_ip and read by macro. */ static expressionS imm_expr; static expressionS imm2_expr; -static expressionS offset_expr; -/* Relocs associated with imm_expr and offset_expr. */ +/* The relocatable field in an instruction and the relocs associated + with it. These variables are used for instructions like LUI and + JAL as well as true offsets. They are also used for address + operands in macros. */ -static bfd_reloc_code_real_type imm_reloc[3] - = {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED}; +static expressionS offset_expr; static bfd_reloc_code_real_type offset_reloc[3] = {BFD_RELOC_UNUSED, BFD_RELOC_UNUSED, BFD_RELOC_UNUSED}; @@ -2970,9 +2971,6 @@ md_assemble (char *str) imm_expr.X_op = O_absent; imm2_expr.X_op = O_absent; offset_expr.X_op = O_absent; - imm_reloc[0] = BFD_RELOC_UNUSED; - imm_reloc[1] = BFD_RELOC_UNUSED; - imm_reloc[2] = BFD_RELOC_UNUSED; offset_reloc[0] = BFD_RELOC_UNUSED; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; @@ -3002,9 +3000,7 @@ md_assemble (char *str) } else { - if (imm_expr.X_op != O_absent) - append_insn (&insn, &imm_expr, imm_reloc, FALSE); - else if (offset_expr.X_op != O_absent) + if (offset_expr.X_op != O_absent) append_insn (&insn, &offset_expr, offset_reloc, FALSE); else append_insn (&insn, NULL, unused_reloc, FALSE); @@ -11187,10 +11183,12 @@ expr_const_in_range (expressionS *ep, offsetT min, offsetT max, int bit) && ep->X_add_number < max << bit); } -/* This routine assembles an instruction into its binary format. As a - side effect, it sets one of the global variables imm_reloc or - offset_reloc to the type of relocation to do if one of the operands - is an address expression. */ +/* Assemble an instruction into its binary format. If the instruction + is a macro, set imm_expr, imm2_expr and offset_expr to the values + associated with "I", "+I" and "A" operands respectively. Otherwise + store the value of the relocatable field (if any) in offset_expr. + In both cases set offset_reloc to the relocation operators applied + to offset_expr. */ static void mips_ip (char *str, struct mips_cl_insn *ip) @@ -11336,9 +11334,6 @@ mips_ip (char *str, struct mips_cl_insn *ip) imm_expr.X_op = O_absent; imm2_expr.X_op = O_absent; offset_expr.X_op = O_absent; - imm_reloc[0] = BFD_RELOC_UNUSED; - imm_reloc[1] = BFD_RELOC_UNUSED; - imm_reloc[2] = BFD_RELOC_UNUSED; offset_reloc[0] = BFD_RELOC_UNUSED; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; @@ -12099,6 +12094,8 @@ mips_ip (char *str, struct mips_cl_insn *ip) { int shift = 8; size_t i; + bfd_reloc_code_real_type r[3]; + /* Check whether there is only a single bracketed expression left. If so, it must be the base register and the constant must be zero. */ @@ -12108,7 +12105,7 @@ mips_ip (char *str, struct mips_cl_insn *ip) /* If this value won't fit into the offset, then go find a macro that will generate a 16- or 32-bit offset code pattern. */ - i = my_getSmallExpression (&imm_expr, imm_reloc, s); + i = my_getSmallExpression (&imm_expr, r, s); if ((i == 0 && (imm_expr.X_op != O_constant || imm_expr.X_add_number >= 1 << shift || imm_expr.X_add_number < -1 << shift)) @@ -12140,6 +12137,7 @@ mips_ip (char *str, struct mips_cl_insn *ip) { int shift = *args == '.' ? 9 : 11; size_t i; + bfd_reloc_code_real_type r[3]; /* Check whether there is only a single bracketed expression left. If so, it must be the base register and the @@ -12150,7 +12148,7 @@ mips_ip (char *str, struct mips_cl_insn *ip) /* If this value won't fit into the offset, then go find a macro that will generate a 16- or 32-bit offset code pattern. */ - i = my_getSmallExpression (&imm_expr, imm_reloc, s); + i = my_getSmallExpression (&imm_expr, r, s); if ((i == 0 && (imm_expr.X_op != O_constant || imm_expr.X_add_number >= 1 << shift || imm_expr.X_add_number < -1 << shift)) @@ -12896,8 +12894,8 @@ mips_ip (char *str, struct mips_cl_insn *ip) case 'i': /* 16-bit unsigned immediate. */ case 'j': /* 16-bit signed immediate. */ - *imm_reloc = BFD_RELOC_LO16; - if (my_getSmallExpression (&imm_expr, imm_reloc, s) == 0) + *offset_reloc = BFD_RELOC_LO16; + if (my_getSmallExpression (&offset_expr, offset_reloc, s) == 0) { int more; offsetT minval, maxval; @@ -12915,14 +12913,14 @@ mips_ip (char *str, struct mips_cl_insn *ip) else minval = -0x8000, maxval = 0xffff; - if (imm_expr.X_op != O_constant - || imm_expr.X_add_number < minval - || imm_expr.X_add_number > maxval) + if (offset_expr.X_op != O_constant + || offset_expr.X_add_number < minval + || offset_expr.X_add_number > maxval) { if (more) break; - if (imm_expr.X_op == O_constant - || imm_expr.X_op == O_big) + if (offset_expr.X_op == O_constant + || offset_expr.X_op == O_big) as_bad (_("Expression out of range")); } } @@ -12963,13 +12961,13 @@ mips_ip (char *str, struct mips_cl_insn *ip) continue; case 'u': /* Upper 16 bits. */ - *imm_reloc = BFD_RELOC_LO16; - if (my_getSmallExpression (&imm_expr, imm_reloc, s) == 0 - && imm_expr.X_op == O_constant - && (imm_expr.X_add_number < 0 - || imm_expr.X_add_number >= 0x10000)) + *offset_reloc = BFD_RELOC_LO16; + if (my_getSmallExpression (&offset_expr, offset_reloc, s) == 0 + && offset_expr.X_op == O_constant + && (offset_expr.X_add_number < 0 + || offset_expr.X_add_number >= 0x10000)) as_bad (_("lui expression (%lu) not in range 0..65535"), - (unsigned long) imm_expr.X_add_number); + (unsigned long) offset_expr.X_add_number); s = expr_end; continue; @@ -13833,12 +13831,9 @@ mips_ip (char *str, struct mips_cl_insn *ip) #define SKIP_SPACE_TABS(S) { while (*(S) == ' ' || *(S) == '\t') ++(S); } -/* This routine assembles an instruction into its binary format when - assembling for the mips16. As a side effect, it sets one of the - global variables imm_reloc or offset_reloc to the type of relocation - to do if one of the operands is an address expression. It also sets - forced_insn_length to the resulting instruction size in bytes if the - user explicitly requested a small or extended instruction. */ +/* As for mips_ip, but used when assembling MIPS16 code. + Also set forced_insn_length to the resulting instruction size in + bytes if the user explicitly requested a small or extended instruction. */ static void mips16_ip (char *str, struct mips_cl_insn *ip) @@ -13901,6 +13896,7 @@ mips16_ip (char *str, struct mips_cl_insn *ip) for (;;) { bfd_boolean ok; + char relax_char; gas_assert (strcmp (insn->name, str) == 0); @@ -13930,14 +13926,12 @@ mips16_ip (char *str, struct mips_cl_insn *ip) create_insn (ip, insn); imm_expr.X_op = O_absent; - imm_reloc[0] = BFD_RELOC_UNUSED; - imm_reloc[1] = BFD_RELOC_UNUSED; - imm_reloc[2] = BFD_RELOC_UNUSED; imm2_expr.X_op = O_absent; offset_expr.X_op = O_absent; offset_reloc[0] = BFD_RELOC_UNUSED; offset_reloc[1] = BFD_RELOC_UNUSED; offset_reloc[2] = BFD_RELOC_UNUSED; + relax_char = 0; for (args = insn->args; 1; ++args) { int c; @@ -13958,19 +13952,31 @@ mips16_ip (char *str, struct mips_cl_insn *ip) offsetT value; /* Stuff the immediate value in now, if we can. */ - if (imm_expr.X_op == O_constant - && *imm_reloc > BFD_RELOC_UNUSED - && insn->pinfo != INSN_MACRO - && calculate_reloc (*offset_reloc, - imm_expr.X_add_number, &value)) + if (insn->pinfo == INSN_MACRO) + { + gas_assert (relax_char == 0); + gas_assert (*offset_reloc == BFD_RELOC_UNUSED); + } + else if (relax_char + && offset_expr.X_op == O_constant + && calculate_reloc (*offset_reloc, + offset_expr.X_add_number, + &value)) { - mips16_immed (NULL, 0, *imm_reloc - BFD_RELOC_UNUSED, - *offset_reloc, value, forced_insn_length, - &ip->insn_opcode); - imm_expr.X_op = O_absent; - *imm_reloc = BFD_RELOC_UNUSED; + mips16_immed (NULL, 0, relax_char, *offset_reloc, value, + forced_insn_length, &ip->insn_opcode); + offset_expr.X_op = O_absent; *offset_reloc = BFD_RELOC_UNUSED; } + else if (relax_char && *offset_reloc != BFD_RELOC_UNUSED) + { + if (forced_insn_length == 2) + as_bad (_("invalid unextended operand value")); + forced_insn_length = 4; + ip->insn_opcode |= MIPS16_EXTEND; + } + else if (relax_char) + *offset_reloc = (int) BFD_RELOC_UNUSED + relax_char; return; } @@ -14141,24 +14147,14 @@ mips16_ip (char *str, struct mips_cl_insn *ip) case 'U': case 'k': case 'K': - i = my_getSmallExpression (&imm_expr, imm_reloc, s); + i = my_getSmallExpression (&offset_expr, offset_reloc, s); if (i > 0) { - if (imm_expr.X_op != O_constant) - { - forced_insn_length = 4; - ip->insn_opcode |= MIPS16_EXTEND; - } - else - { - /* We need to relax this instruction. */ - *offset_reloc = *imm_reloc; - *imm_reloc = (int) BFD_RELOC_UNUSED + c; - } + relax_char = c; s = expr_end; continue; } - *imm_reloc = BFD_RELOC_UNUSED; + *offset_reloc = BFD_RELOC_UNUSED; /* Fall through. */ case '<': case '>': @@ -14166,8 +14162,8 @@ mips16_ip (char *str, struct mips_cl_insn *ip) case ']': case '4': case '8': - my_getExpression (&imm_expr, s); - if (imm_expr.X_op == O_register) + my_getExpression (&offset_expr, s); + if (offset_expr.X_op == O_register) { /* What we thought was an expression turned out to be a register. */ @@ -14177,11 +14173,11 @@ mips16_ip (char *str, struct mips_cl_insn *ip) /* It looks like the expression was omitted before a register indirection, which means that the expression is implicitly zero. We - still set up imm_expr, so that we handle + still set up offset_expr, so that we handle explicit extensions correctly. */ - imm_expr.X_op = O_constant; - imm_expr.X_add_number = 0; - *imm_reloc = (int) BFD_RELOC_UNUSED + c; + offset_expr.X_op = O_constant; + offset_expr.X_add_number = 0; + relax_char = c; continue; } @@ -14189,7 +14185,7 @@ mips16_ip (char *str, struct mips_cl_insn *ip) } /* We need to relax this instruction. */ - *imm_reloc = (int) BFD_RELOC_UNUSED + c; + relax_char = c; s = expr_end; continue; @@ -14207,7 +14203,7 @@ mips16_ip (char *str, struct mips_cl_insn *ip) break; /* We need to relax this instruction. */ - *offset_reloc = (int) BFD_RELOC_UNUSED + c; + relax_char = c; s = expr_end; continue; |