diff options
Diffstat (limited to 'gdb/x86-64-tdep.c')
| -rw-r--r-- | gdb/x86-64-tdep.c | 68 |
1 files changed, 34 insertions, 34 deletions
diff --git a/gdb/x86-64-tdep.c b/gdb/x86-64-tdep.c index a3b7f67..74a4450 100644 --- a/gdb/x86-64-tdep.c +++ b/gdb/x86-64-tdep.c @@ -1,7 +1,6 @@ /* Target-dependent code for the x86-64 for GDB, the GNU debugger. Copyright 2001, 2002 Free Software Foundation, Inc. - Contributed by Jiri Smid, SuSE Labs. This file is part of GDB. @@ -251,18 +250,20 @@ static const char *valid_flavours[] = { }; static const char *disassembly_flavour = att_flavour; +/* Push the return address (pointing to the call dummy) onto the stack + and return the new value for the stack pointer. */ + static CORE_ADDR x86_64_push_return_address (CORE_ADDR pc, CORE_ADDR sp) { char buf[8]; store_unsigned_integer (buf, 8, CALL_DUMMY_ADDRESS ()); - write_memory (sp - 8, buf, 8); return sp - 8; } -void +static void x86_64_pop_frame (void) { generic_pop_current_frame (cfi_pop_frame); @@ -300,8 +301,8 @@ merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2) if (class1 == class2) return class1; - /* Rule #2: If one of the classes is NO_CLASS, the resulting class is - the other class. */ + /* Rule #2: If one of the classes is NO_CLASS, the resulting class + is the other class. */ if (class1 == X86_64_NO_CLASS) return class2; if (class2 == X86_64_NO_CLASS) @@ -328,15 +329,13 @@ merge_classes (enum x86_64_reg_class class1, enum x86_64_reg_class class2) return X86_64_SSE_CLASS; } +/* Classify the argument type. CLASSES will be filled by the register + class used to pass each word of the operand. The number of words + is returned. In case the parameter should be passed in memory, 0 + is returned. As a special case for zero sized containers, + classes[0] will be NO_CLASS and 1 is returned. -/* Classify the argument type. - CLASSES will be filled by the register class used to pass each word - of the operand. The number of words is returned. In case the parameter - should be passed in memory, 0 is returned. As a special case for zero - sized containers, classes[0] will be NO_CLASS and 1 is returned. - - See the x86-64 PS ABI for details. -*/ + See the x86-64 psABI for details. */ static int classify_argument (struct type *type, @@ -361,8 +360,8 @@ classify_argument (struct type *type, for (i = 0; i < words; i++) classes[i] = X86_64_NO_CLASS; - /* Zero sized arrays or structures are NO_CLASS. We return 0 to - signalize memory class, so handle it as special case. */ + /* Zero sized arrays or structures are NO_CLASS. We return 0 + to signalize memory class, so handle it as special case. */ if (!words) { classes[0] = X86_64_NO_CLASS; @@ -445,7 +444,7 @@ classify_argument (struct type *type, && (i == 0 || classes[i - 1] != X86_64_SSE_CLASS)) classes[i] = X86_64_SSE_CLASS; - /* X86_64_X87UP_CLASS should be preceeded by X86_64_X87_CLASS. */ + /* X86_64_X87UP_CLASS should be preceeded by X86_64_X87_CLASS. */ if (classes[i] == X86_64_X87UP_CLASS && (i == 0 || classes[i - 1] != X86_64_X87_CLASS)) classes[i] = X86_64_SSE_CLASS; @@ -499,8 +498,9 @@ classify_argument (struct type *type, "classify_argument: unknown argument type"); } -/* Examine the argument and return set number of register required in each - class. Return 0 ifif parameter should be passed in memory. */ +/* Examine the argument and set *INT_NREGS and *SSE_NREGS to the + number of registers required based on the information passed in + CLASSES. Return 0 if parameter should be passed in memory. */ static int examine_argument (enum x86_64_reg_class classes[MAX_CLASSES], @@ -538,9 +538,9 @@ examine_argument (enum x86_64_reg_class classes[MAX_CLASSES], #define RET_SSE_REGS 2 /* Check if the structure in value_type is returned in registers or in - memory. If this function returns 1, gdb will call STORE_STRUCT_RETURN and - EXTRACT_STRUCT_VALUE_ADDRESS else STORE_RETURN_VALUE and EXTRACT_RETURN_VALUE - will be used. */ + memory. If this function returns 1, GDB will call + STORE_STRUCT_RETURN and EXTRACT_STRUCT_VALUE_ADDRESS else + STORE_RETURN_VALUE and EXTRACT_RETURN_VALUE will be used. */ int x86_64_use_struct_convention (int gcc_p, struct type *value_type) { @@ -554,7 +554,6 @@ x86_64_use_struct_convention (int gcc_p, struct type *value_type) needed_intregs > RET_INT_REGS || needed_sseregs > RET_SSE_REGS); } - /* Extract from an array REGBUF containing the (raw) register state, a function return value of TYPE, and copy that, in virtual format, into VALBUF. */ @@ -637,10 +636,10 @@ x86_64_extract_return_value (struct type *type, char *regbuf, char *valbuf) } } -/* Handled by unwind informations. */ static void x86_64_frame_init_saved_regs (struct frame_info *fi) { + /* Do nothing. Everything is handled by the stack unwinding code. */ } #define INT_REGS 6 @@ -862,30 +861,31 @@ x86_64_skip_prologue (CORE_ADDR pc) struct symtab_and_line v_sal; struct symbol *v_function; CORE_ADDR endaddr; + unsigned char prolog_buf[PROLOG_BUFSIZE]; - /* We will handle only functions beginning with: - 55 pushq %rbp - 48 89 e5 movq %rsp,%rbp - */ - unsigned char prolog_expect[PROLOG_BUFSIZE] = { 0x55, 0x48, 0x89, 0xe5 }, - prolog_buf[PROLOG_BUFSIZE]; + /* We will handle only functions starting with: */ + static unsigned char prolog_expect[PROLOG_BUFSIZE] = + { + 0x55, /* pushq %rbp */ + 0x48, 0x89, 0xe5 /* movq %rsp, %rbp */ + }; read_memory (pc, (char *) prolog_buf, PROLOG_BUFSIZE); - /* First check, whether pc points to pushq %rbp, movq %rsp,%rbp. */ + /* First check, whether pc points to pushq %rbp, movq %rsp, %rbp. */ for (i = 0; i < PROLOG_BUFSIZE; i++) if (prolog_expect[i] != prolog_buf[i]) - return pc; /* ... no, it doesn't. Nothing to skip. */ + return pc; /* ... no, it doesn't. Nothing to skip. */ - /* OK, we have found the prologue and want PC of the first + /* OK, we have found the prologue and want PC of the first non-prologue instruction. */ pc += PROLOG_BUFSIZE; v_function = find_pc_function (pc); v_sal = find_pc_line (pc, 0); - /* If pc doesn't point to a function with debuginfo, - some of the following may be NULL. */ + /* If pc doesn't point to a function with debuginfo, some of the + following may be NULL. */ if (!v_function || !v_function->ginfo.value.block || !v_sal.symtab) return pc; |