diff options
Diffstat (limited to 'gdb/alpha-tdep.c')
| -rw-r--r-- | gdb/alpha-tdep.c | 43 |
1 files changed, 39 insertions, 4 deletions
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c index 4dc3e8e45a3..564896fdc94 100644 --- a/gdb/alpha-tdep.c +++ b/gdb/alpha-tdep.c @@ -649,11 +649,13 @@ heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, struct frame_info *next_frame) { CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM); + CORE_ADDR vfp = sp; CORE_ADDR cur_pc; int frame_size; int has_frame_reg = 0; unsigned long reg_mask = 0; int pcreg = -1; + int regno; if (start_pc == 0) return NULL; @@ -678,7 +680,12 @@ heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */ { if (word & 0x8000) - frame_size += (-word) & 0xffff; + { + /* Consider only the first stack allocation instruction + to contain the static size of the frame. */ + if (frame_size == 0) + frame_size += (-word) & 0xffff; + } else /* Exit loop if a positive stack adjustment is found, which usually means that the stack cleanup code in the function @@ -690,7 +697,16 @@ heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, { int reg = (word & 0x03e00000) >> 21; reg_mask |= 1 << reg; - temp_saved_regs[reg] = sp + (short) word; + + /* Do not compute the address where the register was saved yet, + because we don't know yet if the offset will need to be + relative to $sp or $fp (we can not compute the address relative + to $sp if $sp is updated during the execution of the current + subroutine, for instance when doing some alloca). So just store + the offset for the moment, and compute the address later + when we know whether this frame has a frame pointer or not. + */ + temp_saved_regs[reg] = (short) word; /* Starting with OSF/1-3.2C, the system libraries are shipped without local symbols, but they still contain procedure @@ -719,8 +735,15 @@ heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, } else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */ pcreg = (word >> 16) & 0x1f; - else if (word == 0x47de040f) /* bis sp,sp fp */ - has_frame_reg = 1; + else if (word == 0x47de040f || word == 0x47fe040f) /* bis sp,sp fp */ + { + /* ??? I am not sure what instruction is 0x47fe040f, and I + am suspecting that there was a typo and should have been + 0x47fe040f. I'm keeping it in the test above until further + investigation */ + has_frame_reg = 1; + vfp = read_next_frame_reg (next_frame, ALPHA_GCC_FP_REGNUM); + } } if (pcreg == -1) { @@ -759,6 +782,18 @@ heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc, PROC_FRAME_REG (&temp_proc_desc) = ALPHA_GCC_FP_REGNUM; else PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM; + + /* At this point, we know which of the Stack Pointer or the Frame Pointer + to use as the reference address to compute the saved registers address. + But in both cases, the processing above has set vfp to this reference + address, so just need to increment the offset of each saved register + by this address. */ + for (regno = 0; regno < NUM_REGS; regno++) + { + if (reg_mask & 1 << regno) + temp_saved_regs[regno] += vfp; + } + PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size; PROC_REG_MASK (&temp_proc_desc) = reg_mask; PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? ALPHA_RA_REGNUM : pcreg; |